/// <inheritdoc />
public async Task BindModelAsync(ModelBindingContext bindingContext)
{
if (bindingContext == null)
{
throw new ArgumentNullException(nameof(bindingContext));
}
// Try to get the XElement.
ModelBindingResult result;
var xElementMetadata = bindingContext.ModelMetadata.GetMetadataForType(typeof(XElement));
using (var innerContext = bindingContext.EnterNestedScope(
xElementMetadata,
bindingContext.FieldName,
bindingContext.ModelName,
bindingContext.Model))
{
await _bodyModelBinder.BindModelAsync(bindingContext);
result = bindingContext.Result;
}
// If we got the XElement, create the SalesforceNotifications instance and return that.
if (result.IsModelSet)
{
result = ModelBindingResult.Success(new SalesforceNotifications((XElement)result.Model));
}
bindingContext.Result = result;
}
internal async Task <ModelBindingResult> TryBindStrongModel <TModel>(
ModelBindingContext bindingContext,
IModelBinder binder,
string propertyName)
{
var propertyModelMetadata = bindingContext.ModelMetadata.Properties[propertyName];
var propertyModelName = ModelNames.CreatePropertyModelName(bindingContext.ModelName, propertyName);
using (bindingContext.EnterNestedScope(
modelMetadata: propertyModelMetadata,
fieldName: propertyName,
modelName: propertyModelName,
model: null))
{
await binder.BindModelAsync(bindingContext);
var result = bindingContext.Result;
if (result != null && result.Value.IsModelSet)
{
return(result.Value);
}
else
{
return(ModelBindingResult.Failed(propertyModelName));
}
}
}
/// <summary>
/// Binds the model.
/// </summary>
public async Task BindModelAsync(ModelBindingContext bindingContext)
{
var typeFieldNamePrefix = !string.IsNullOrEmpty(bindingContext.ModelName)
? $"{bindingContext.ModelName}."
: "";
var typeNameResult = bindingContext.ValueProvider
.GetValue($"{typeFieldNamePrefix}{_baseType.Name}Type");
if (typeNameResult == null || typeNameResult.Count() != 1)
{
return;
}
var typeName = typeNameResult.First();
var derivedModelBinderKvp = _derivedModelBinders.First(kvp => kvp.Key.Name == typeName);
var derivedModelType = derivedModelBinderKvp.Key;
var derivedModelBinder = derivedModelBinderKvp.Value;
ModelBindingResult result;
using (bindingContext.EnterNestedScope(
_modelMetadataProvider.GetMetadataForType(derivedModelType),
bindingContext.FieldName,
bindingContext.ModelName,
model: null
))
{
await derivedModelBinder.BindModelAsync(bindingContext);
result = bindingContext.Result;
}
bindingContext.Result = result;
}
private async ValueTask <ModelBindingResult> BindParameterAsync(
ModelBindingContext bindingContext,
ModelMetadata parameter,
IModelBinder parameterBinder,
string fieldName,
string modelName)
{
Debug.Assert(parameter.MetadataKind == ModelMetadataKind.Parameter);
ModelBindingResult result;
using (bindingContext.EnterNestedScope(
modelMetadata: parameter,
fieldName: fieldName,
modelName: modelName,
model: null))
{
await parameterBinder.BindModelAsync(bindingContext);
result = bindingContext.Result;
}
if (!result.IsModelSet && parameter.IsBindingRequired)
{
var message = parameter.ModelBindingMessageProvider.MissingBindRequiredValueAccessor(fieldName);
bindingContext.ModelState.TryAddModelError(modelName, message);
}
return(result);
}
public async Task BindModelAsync(ModelBindingContext bindingContext)
{
if (bindingContext == null)
{
throw new ArgumentNullException(nameof(bindingContext));
}
var fieldName = nameof(Model.Value);
var modelName = ModelNames.CreatePropertyModelName(bindingContext.ModelName, fieldName);
ModelBindingResult valueResult;
using (bindingContext.EnterNestedScope(
bindingContext.ModelMetadata.Properties[fieldName],
fieldName,
modelName,
model: null))
{
await _binder.BindModelAsync(bindingContext);
valueResult = bindingContext.Result;
}
if (!valueResult.IsModelSet)
{
return;
}
var model = new Model
{
FieldName = bindingContext.FieldName,
Value = (string)valueResult.Model,
};
bindingContext.Result = ModelBindingResult.Success(model);
}
public async Task BindModelAsync(ModelBindingContext bindingContext)
{
//绑定 对象部分
if (bindingContext == null)
{
throw new ArgumentNullException(nameof(bindingContext));
}
// Retrieve the form part containing the JSON
var valueResult = bindingContext.ValueProvider.GetValue(bindingContext.FieldName);
if (valueResult == ValueProviderResult.None)
{
// The JSON was not found
var message = bindingContext.ModelMetadata.ModelBindingMessageProvider.MissingBindRequiredValueAccessor(bindingContext.FieldName);
bindingContext.ModelState.TryAddModelError(bindingContext.ModelName, message);
return;
}
var rawValue = valueResult.FirstValue;
// Deserialize the JSON
var model = JsonConvert.DeserializeObject(rawValue, bindingContext.ModelType, _jsonOptions.Value.SerializerSettings);
// Now, bind each of the IFormFile properties from the other form parts
foreach (var property in bindingContext.ModelMetadata.Properties)
{
//if (property.ModelType != typeof(IFormFile))
if (property.ModelType != typeof(IFormFile))
{
continue;
}
var fieldName = property.BinderModelName ?? property.PropertyName;
var modelName = fieldName;
var propertyModel = bindingContext.ValueProvider.GetValue(fieldName);
//var propertyModel = property.PropertyGetter(bindingContext.Model);
ModelBindingResult propertyResult;
using (bindingContext.EnterNestedScope(property, fieldName, modelName, propertyModel))
{
await _formFileModelBinder.BindModelAsync(bindingContext);
propertyResult = bindingContext.Result;
}
if (propertyResult.IsModelSet)
{
// The IFormFile was sucessfully bound, assign it to the corresponding property of the model
property.PropertySetter(model, propertyResult.Model);
}
else if (property.IsBindingRequired)
{
var message = property.ModelBindingMessageProvider.MissingBindRequiredValueAccessor(fieldName);
bindingContext.ModelState.TryAddModelError(modelName, message);
}
}
// Set the successfully constructed model as the result of the model binding
bindingContext.Result = ModelBindingResult.Success(model);
}
public async Task BindModelAsync(ModelBindingContext bindingContext)
{
if (bindingContext == null)
{
throw new ArgumentNullException(nameof(bindingContext));
}
var typeValue = bindingContext.ValueProvider.GetValue(nameof(ComplexModel.Type)).Values;
var nameValue = bindingContext.ValueProvider.GetValue(nameof(ComplexModel.Name)).Values;
var finalModel = new ComplexModel
{
Name = nameValue,
Type = typeValue
};
var innerType = LookupType(typeValue);
if (innerType != null)
{
finalModel.Parameters = Activator.CreateInstance(innerType);
var modelMetadata = _modelMetadataProvider.GetMetadataForType(innerType);
var modelBinder = _modelBinderFactory.CreateBinder(new ModelBinderFactoryContext
{
Metadata = modelMetadata,
CacheToken = modelMetadata
});
var modelName = bindingContext.BinderModelName == null ? "Parameters" : $"{bindingContext.BinderModelName}.Parameters";
using (var scope = bindingContext.EnterNestedScope(modelMetadata, modelName, modelName, finalModel.Parameters))
{
await modelBinder.BindModelAsync(bindingContext);
}
}
bindingContext.Result = ModelBindingResult.Success(finalModel);
return;
}
public async Task BindModelAsync(ModelBindingContext bindingContext)
{
var messageTypeModelName = ModelNames.CreatePropertyModelName(bindingContext.ModelName, "messageType");
var messageTypeResult = bindingContext.ValueProvider.GetValue(messageTypeModelName);
if (messageTypeResult == ValueProviderResult.None)
{
bindingContext.Result = ModelBindingResult.Failed();
return;
}
IModelBinder binder;
if (!_binders.TryGetValue(messageTypeResult.FirstValue, out binder))
{
bindingContext.Result = ModelBindingResult.Failed();
return;
}
// Now know the type exists in the assembly.
var type = Type.GetType(messageTypeResult.FirstValue);
var metadata = _metadataProvider.GetMetadataForType(type);
ModelBindingResult result;
using (bindingContext.EnterNestedScope(metadata, bindingContext.FieldName, bindingContext.ModelName, model: null))
{
await binder.BindModelAsync(bindingContext);
result = bindingContext.Result;
}
bindingContext.Result = result;
}
public async Task BindModelAsync(ModelBindingContext bindingContext)
{
if (!int.TryParse(bindingContext.ValueProvider.GetValue("id").FirstValue, out int productId))
{
throw new Exception("The product id was not provided");
}
var editModel = new ProductConfigurationEditModel
{
Fields = productRepository.GetProductFields(productId)
};
for (int i = 0; i < editModel.Fields.Count; i++)
{
BaseField field = editModel.Fields[i];
ModelMetadata modelMetadata = modelMetadataProvider.GetMetadataForType(field.GetType());
IModelBinder modelBinder = modelBinderFactory.CreateBinder(new ModelBinderFactoryContext
{
Metadata = modelMetadata,
CacheToken = modelMetadata
});
string modelName = $"{bindingContext.BinderModelName}.Fields[{i}]".TrimStart('.');
using (var scope = bindingContext.EnterNestedScope(modelMetadata, modelName, modelName, field))
{
await modelBinder.BindModelAsync(bindingContext);
}
}
bindingContext.Result = ModelBindingResult.Success(editModel);
}
private async Task BindModelCoreAsync(ModelBindingContext bindingContext)
{
// Create model first (if necessary) to avoid reporting errors about properties when activation fails.
if (bindingContext.Model == null)
{
bindingContext.Model = CreateModel(bindingContext);
}
for (var i = 0; i < bindingContext.ModelMetadata.Properties.Count; i++)
{
var property = bindingContext.ModelMetadata.Properties[i];
if (!CanBindProperty(bindingContext, property))
{
continue;
}
// Pass complex (including collection) values down so that binding system does not unnecessarily
// recreate instances or overwrite inner properties that are not bound. No need for this with simple
// values because they will be overwritten if binding succeeds. Arrays are never reused because they
// cannot be resized.
object propertyModel = null;
if (property.PropertyGetter != null &&
property.IsComplexType &&
!property.ModelType.IsArray)
{
propertyModel = property.PropertyGetter(bindingContext.Model);
}
var fieldName = property.BinderModelName ?? property.PropertyName;
var modelName = ModelNames.CreatePropertyModelName(bindingContext.ModelName, fieldName);
ModelBindingResult result;
using (bindingContext.EnterNestedScope(
modelMetadata: property,
fieldName: fieldName,
modelName: modelName,
model: propertyModel))
{
await BindProperty(bindingContext);
result = bindingContext.Result;
}
if (result.IsModelSet)
{
SetProperty(bindingContext, modelName, property, result);
}
else if (property.IsBindingRequired)
{
var message = property.ModelBindingMessageProvider.MissingBindRequiredValueAccessor(fieldName);
bindingContext.ModelState.TryAddModelError(modelName, message);
}
}
bindingContext.Result = ModelBindingResult.Success(bindingContext.Model);
_logger.DoneAttemptingToBindModel(bindingContext);
}
public async Task BindModelAsync(ModelBindingContext bindingContext)
{
if (bindingContext == null)
{
throw new ArgumentNullException(paramName: nameof(bindingContext));
}
//recupere a parte do formulario que contem o JSon
var valueResult = bindingContext.ValueProvider.GetValue(bindingContext.FieldName);
if (valueResult == ValueProviderResult.None)
{
// O JSon não foi encontrado
var message = bindingContext.ModelMetadata.ModelBindingMessageProvider.MissingBindRequiredValueAccessor(bindingContext.FieldName);
bindingContext.ModelState.TryAddModelError(key: bindingContext.ModelName, message);
return;
}
var rawValue = valueResult.FirstValue;
// desserializar o modelo JSON
var model = JsonConvert.DeserializeObject(rawValue, bindingContext.ModelType, _jsonOptions.Value.SerializerSettings);
//Agora, vincule cada uma das propriedades IFormFile das outras partes do formulário
foreach (var property in bindingContext.ModelMetadata.Properties)
{
if (property.ModelType != typeof(IFormFile))
{
continue;
}
var fieldName = property.BinderModelName ?? property.PropertyName;
var modelName = fieldName;
var propertyModel = property.PropertyGetter(bindingContext.Model);
ModelBindingResult propertyResult;
using (bindingContext.EnterNestedScope(property, fieldName, modelName, propertyModel))
{
await _formFileModelBinder.BindModelAsync(bindingContext);
propertyResult = bindingContext.Result;
}
if (propertyResult.IsModelSet)
{
// O IFormFile foi vinculado com sucesso, atribua - o à propriedade correspondente da propriedade do modelo PropertySetter
property.PropertySetter(model, propertyResult.Model);
}
else if (property.IsBindingRequired)
{
var message = property.ModelBindingMessageProvider.MissingBindRequiredValueAccessor(fieldName);
bindingContext.ModelState.TryAddModelError(key: modelName, message);
}
}
//Defina o modelo construído com sucesso como resultado do modelo binding
bindingContext.Result = ModelBindingResult.Success(model);
}
public async Task BindModelAsync(ModelBindingContext bindingContext)
{
if (bindingContext == null)
{
throw new ArgumentNullException(nameof(bindingContext));
}
_logger.AttemptingToBindModel(bindingContext);
// Property name can be null if the model metadata represents a type (rather than a property or parameter).
var headerName = bindingContext.FieldName;
// Do not set ModelBindingResult to Failed on not finding the value in the header as we want the inner
// ModelBinder to do that. This would give a chance to the inner binder to add more useful information.
// For example, SimpleTypeModelBinder adds a model error when binding to let's say an integer and the
// model is null.
var request = bindingContext.HttpContext.Request;
if (!request.Headers.ContainsKey(headerName))
{
_logger.FoundNoValueInRequest(bindingContext);
}
if (InnerModelBinder == null)
{
BindWithoutInnerBinder(bindingContext);
return;
}
var headerValueProvider = GetHeaderValueProvider(headerName, bindingContext);
// Capture the top level object here as entering nested scope would make it 'false'.
var isTopLevelObject = bindingContext.IsTopLevelObject;
// Create a new binding scope in order to supply the HeaderValueProvider so that the binders like
// SimpleTypeModelBinder can find values from header.
ModelBindingResult result;
using (bindingContext.EnterNestedScope(
bindingContext.ModelMetadata,
fieldName: bindingContext.FieldName,
modelName: bindingContext.ModelName,
model: bindingContext.Model))
{
bindingContext.IsTopLevelObject = isTopLevelObject;
bindingContext.ValueProvider = headerValueProvider;
await InnerModelBinder.BindModelAsync(bindingContext);
result = bindingContext.Result;
}
bindingContext.Result = result;
_logger.DoneAttemptingToBindModel(bindingContext);
}
public async Task BindModelAsync(ModelBindingContext bindingContext)
{
if (bindingContext == null)
{
throw new ArgumentNullException(nameof(bindingContext));
}
var valueResult = bindingContext.ValueProvider.GetValue(bindingContext.FieldName);
if (valueResult == ValueProviderResult.None)
{
string message = bindingContext.ModelMetadata.ModelBindingMessageProvider.MissingBindRequiredValueAccessor(bindingContext.FieldName);
bindingContext.ModelState.TryAddModelError(bindingContext.ModelName, message);
return;
}
string rawValue = valueResult.FirstValue;
object model = JsonSerializer.Deserialize(rawValue, bindingContext.ModelType);
foreach (var property in bindingContext.ModelMetadata.Properties)
{
if (property.ModelType != typeof(IFormFile))
{
continue;
}
string fieldName = property.BinderModelName ?? property.PropertyName;
string modelName = fieldName;
object propertyModel = property.PropertyGetter(bindingContext.Model);
ModelBindingResult propertyResult;
using (bindingContext.EnterNestedScope(property, fieldName, modelName, propertyModel))
{
await _formFileModelBinder.BindModelAsync(bindingContext);
propertyResult = bindingContext.Result;
}
if (propertyResult.IsModelSet)
{
property.PropertySetter(model, propertyResult.Model);
}
else if (property.IsBindingRequired)
{
string message = property.ModelBindingMessageProvider.MissingBindRequiredValueAccessor(fieldName);
bindingContext.ModelState.TryAddModelError(modelName, message);
}
}
bindingContext.Result = ModelBindingResult.Success(model);
}
private bool CanValueBindAnyModelProperties(ModelBindingContext bindingContext)
{
if (bindingContext.ModelMetadata.Properties.Count == 0)
{
return(false);
}
var hasBindableProperty = false;
var isAnyPropertyEnabledForValueProviderBasedBinding = false;
for (var i = 0; i < bindingContext.ModelMetadata.Properties.Count; i++)
{
var propertyMetadata = bindingContext.ModelMetadata.Properties[i];
if (!CanBindProperty(bindingContext, propertyMetadata))
{
continue;
}
hasBindableProperty = true;
var bindingSource = propertyMetadata.BindingSource;
if (bindingSource == null || !bindingSource.IsGreedy)
{
isAnyPropertyEnabledForValueProviderBasedBinding = true;
var fieldName = propertyMetadata.BinderModelName ?? propertyMetadata.PropertyName;
var modelName = ModelNames.CreatePropertyModelName(
bindingContext.ModelName,
fieldName);
using (bindingContext.EnterNestedScope(
modelMetadata: propertyMetadata,
fieldName: fieldName,
modelName: modelName,
model: null))
{
if (bindingContext.ValueProvider.ContainsPrefix(bindingContext.ModelName))
{
return(true);
}
}
}
}
if (hasBindableProperty && !isAnyPropertyEnabledForValueProviderBasedBinding)
{
return(true);
}
return(false);
}
public async Task BindModelAsync(ModelBindingContext bindingContext)
{
if (bindingContext == null)
{
throw new ArgumentNullException(nameof(bindingContext));
}
var valueResult = bindingContext.ValueProvider.GetValue(bindingContext.FieldName);
if (valueResult == ValueProviderResult.None)
{
var message = bindingContext.ModelMetadata.ModelBindingMessageProvider.MissingBindRequiredValueAccessor(bindingContext.FieldName);
bindingContext.ModelState.TryAddModelError(bindingContext.ModelName, message);
return;
}
var rawValue = valueResult.FirstValue;
var options = new JsonSerializerOptions {
PropertyNameCaseInsensitive = true
};
var model = JsonSerializer.Deserialize(rawValue, bindingContext.ModelType, options);
foreach (ModelMetadata property in bindingContext.ModelMetadata.Properties)
{
if (property.ModelType != typeof(IFormFile) &&
property.ModelType != typeof(IFormFile[]) &&
property.ModelType != typeof(List <IFormFile>))
{
continue;
}
var fieldName = property.BinderModelName ?? property.PropertyName;
var modelName = fieldName;
var propertyModel = property.PropertyGetter(bindingContext.Model);
ModelBindingResult propertyResult;
using (bindingContext.EnterNestedScope(property, fieldName, modelName, propertyModel))
{
await formFileModelBinder.BindModelAsync(bindingContext).ConfigureAwait(false);
propertyResult = bindingContext.Result;
}
if (propertyResult.IsModelSet)
{
property.PropertySetter(model, propertyResult.Model);
}
else if (property.IsBindingRequired)
{
var message = property.ModelBindingMessageProvider.MissingBindRequiredValueAccessor(fieldName);
bindingContext.ModelState.TryAddModelError(modelName, message);
}
}
bindingContext.Result = ModelBindingResult.Success(model);
}
private async ValueTask <ModelBindingResult> BindPropertyAsync(
ModelBindingContext bindingContext,
ModelMetadata property,
IModelBinder propertyBinder,
string fieldName,
string modelName)
{
Debug.Assert(property.MetadataKind == ModelMetadataKind.Property);
// Pass complex (including collection) values down so that binding system does not unnecessarily
// recreate instances or overwrite inner properties that are not bound. No need for this with simple
// values because they will be overwritten if binding succeeds. Arrays are never reused because they
// cannot be resized.
object propertyModel = null;
if (property.PropertyGetter != null &&
property.IsComplexType &&
!property.ModelType.IsArray)
{
propertyModel = property.PropertyGetter(bindingContext.Model);
}
ModelBindingResult result;
using (bindingContext.EnterNestedScope(
modelMetadata: property,
fieldName: fieldName,
modelName: modelName,
model: propertyModel))
{
await propertyBinder.BindModelAsync(bindingContext);
result = bindingContext.Result;
}
if (result.IsModelSet)
{
SetProperty(bindingContext, modelName, property, result);
}
else if (property.IsBindingRequired)
{
var message = property.ModelBindingMessageProvider.MissingBindRequiredValueAccessor(fieldName);
bindingContext.ModelState.TryAddModelError(modelName, message);
}
return(result);
}
/// <summary>
/// Binds the current model from the context.
/// </summary>
/// <param name="bc">The binding context</param>
/// <returns>An asynchronous task</returns>
public async Task BindModelAsync(ModelBindingContext bc)
{
var result = ModelBindingResult.Failed();
var typeName = "";
// Get the requested abstract type
if (bc.ModelType == typeof(PageEditRegionBase))
{
typeName = bc.ValueProvider.GetValue(bc.ModelName + ".CLRType").FirstValue;
}
else if (bc.ModelType == typeof(Extend.IField))
{
typeName = bc.ValueProvider.GetValue(bc.ModelName.Replace(".Value", "") + ".CLRType").FirstValue;
}
else if (bc.ModelType == typeof(Extend.Block))
{
typeName = bc.ValueProvider.GetValue(bc.ModelName.Replace(".Value", "") + ".CLRType").FirstValue;
}
if (!String.IsNullOrEmpty(typeName))
{
try {
if (binders.ContainsKey(typeName))
{
// Get the binder for the abstract type
var item = binders[typeName];
var metadata = provider.GetMetadataForType(item.Type);
// Let the default binders take care of it once
// that the real type has been discovered.
ModelBindingResult scoped;
using (bc.EnterNestedScope(
metadata,
bc.FieldName,
bc.ModelName,
model: null)) {
await item.Binder.BindModelAsync(bc);
scoped = bc.Result;
}
result = scoped;
}
} catch { }
}
bc.Result = result;
}
internal async Task <ModelBindingResult> TryBindStrongModel <TModel>(
ModelBindingContext bindingContext,
IModelBinder binder,
string propertyName,
string propertyModelName)
{
var propertyModelMetadata = bindingContext.ModelMetadata.Properties[propertyName];
using (bindingContext.EnterNestedScope(
modelMetadata: propertyModelMetadata,
fieldName: propertyName,
modelName: propertyModelName,
model: null))
{
await binder.BindModelAsync(bindingContext);
return(bindingContext.Result);
}
}
// Used when the ValueProvider contains the collection to be bound as a single element, e.g. the raw value
// is [ "1", "2" ] and needs to be converted to an int[].
// Internal for testing.
internal async Task <CollectionResult> BindSimpleCollection(
ModelBindingContext bindingContext,
ValueProviderResult values)
{
var boundCollection = new List <TElement>();
var metadataProvider = bindingContext.OperationBindingContext.MetadataProvider;
var elementMetadata = metadataProvider.GetMetadataForType(typeof(TElement));
foreach (var value in values)
{
bindingContext.ValueProvider = new CompositeValueProvider
{
// our temporary provider goes at the front of the list
new ElementalValueProvider(bindingContext.ModelName, value, values.Culture),
bindingContext.ValueProvider
};
object boundValue = null;
using (bindingContext.EnterNestedScope(
elementMetadata,
fieldName: bindingContext.FieldName,
modelName: bindingContext.ModelName,
model: null))
{
await ElementBinder.BindModelAsync(bindingContext);
if (bindingContext.Result != null && bindingContext.Result.Value.IsModelSet)
{
boundValue = bindingContext.Result.Value.Model;
boundCollection.Add(ModelBindingHelper.CastOrDefault <TElement>(boundValue));
}
}
}
return(new CollectionResult
{
Model = boundCollection
});
}
// Used when the ValueProvider contains the collection to be bound as a single element, e.g. the raw value
// is [ "1", "2" ] and needs to be converted to an int[].
// Internal for testing.
internal async Task <CollectionResult> BindSimpleCollection(
ModelBindingContext bindingContext,
ValueProviderResult values)
{
var boundCollection = new List <TElement>();
var elementMetadata = bindingContext.ModelMetadata.ElementMetadata;
foreach (var value in values)
{
bindingContext.ValueProvider = new CompositeValueProvider
{
// our temporary provider goes at the front of the list
new ElementalValueProvider(bindingContext.ModelName, value, values.Culture),
bindingContext.ValueProvider
};
// Enter new scope to change ModelMetadata and isolate element binding operations.
using (bindingContext.EnterNestedScope(
elementMetadata,
fieldName: bindingContext.FieldName,
modelName: bindingContext.ModelName,
model: null))
{
await ElementBinder.BindModelAsync(bindingContext);
if (bindingContext.Result.IsModelSet)
{
var boundValue = bindingContext.Result.Model;
boundCollection.Add(CastOrDefault <TElement>(boundValue));
}
}
}
return(new CollectionResult
{
Model = boundCollection
});
}
private bool CanBindAnyModelProperties(ModelBindingContext bindingContext)
{
if (bindingContext.ModelMetadata.Properties.Count == 0)
{
return(false);
}
for (var i = 0; i < bindingContext.ModelMetadata.Properties.Count; i++)
{
var propertyMetadata = bindingContext.ModelMetadata.Properties[i];
if (!CanBindProperty(bindingContext, propertyMetadata))
{
continue;
}
var bindingSource = propertyMetadata.BindingSource;
if (bindingSource != null && bindingSource.IsGreedy)
{
return(true);
}
var fieldName = propertyMetadata.BinderModelName ?? propertyMetadata.PropertyName;
var modelName = ModelNames.CreatePropertyModelName(bindingContext.ModelName, fieldName);
using (bindingContext.EnterNestedScope(propertyMetadata, fieldName, modelName, null))
{
if (bindingContext.ValueProvider.ContainsPrefix(bindingContext.ModelName))
{
return(true);
}
}
}
return(false);
}
private bool CanValueBindAnyModelProperties(ModelBindingContext bindingContext)
{
// If there are no properties on the model, there is nothing to bind. We are here means this is not a top
// level object. So we return false.
if (bindingContext.ModelMetadata.Properties.Count == 0)
{
return(false);
}
// We want to check to see if any of the properties of the model can be bound using the value providers,
// because that's all that MutableObjectModelBinder can handle.
//
// However, because a property might specify a custom binding source ([FromForm]), it's not correct
// for us to just try bindingContext.ValueProvider.ContainsPrefixAsync(bindingContext.ModelName),
// because that may include other value providers - that would lead us to mistakenly create the model
// when the data is coming from a source we should use (ex: value found in query string, but the
// model has [FromForm]).
//
// To do this we need to enumerate the properties, and see which of them provide a binding source
// through metadata, then we decide what to do.
//
// If a property has a binding source, and it's a greedy source, then it's not
// allowed to come from a value provider, so we skip it.
//
// If a property has a binding source, and it's a non-greedy source, then we'll filter the
// the value providers to just that source, and see if we can find a matching prefix
// (see CanBindValue).
//
// If a property does not have a binding source, then it's fair game for any value provider.
//
// If any property meets the above conditions and has a value from valueproviders, then we'll
// create the model and try to bind it. OR if ALL properties of the model have a greedy source,
// then we go ahead and create it.
//
var hasBindableProperty = false;
var isAnyPropertyEnabledForValueProviderBasedBinding = false;
foreach (var propertyMetadata in bindingContext.ModelMetadata.Properties)
{
if (!CanBindProperty(bindingContext, propertyMetadata))
{
continue;
}
hasBindableProperty = true;
// This check will skip properties which are marked explicitly using a non value binder.
var bindingSource = propertyMetadata.BindingSource;
if (bindingSource == null || !bindingSource.IsGreedy)
{
isAnyPropertyEnabledForValueProviderBasedBinding = true;
var fieldName = propertyMetadata.BinderModelName ?? propertyMetadata.PropertyName;
var modelName = ModelNames.CreatePropertyModelName(
bindingContext.ModelName,
fieldName);
using (bindingContext.EnterNestedScope(
modelMetadata: propertyMetadata,
fieldName: fieldName,
modelName: modelName,
model: null))
{
// If any property can return a true value.
if (CanBindValue(bindingContext))
{
return(true);
}
}
}
}
if (hasBindableProperty && !isAnyPropertyEnabledForValueProviderBasedBinding)
{
// All the properties are marked with a non value provider based marker like [FromHeader] or
// [FromBody].
return(true);
}
return(false);
}
private int CanBindAnyModelItem(ModelBindingContext bindingContext)
{
// If there are no properties on the model, and no constructor parameters, there is nothing to bind. We are here means this is not a top
// level object. So we return false.
var modelMetadata = bindingContext.ModelMetadata;
var performsConstructorBinding = bindingContext.Model == null && modelMetadata.BoundConstructor != null;
if (modelMetadata.Properties.Count == 0 &&
(!performsConstructorBinding || modelMetadata.BoundConstructor.BoundConstructorParameters.Count == 0))
{
Log.NoPublicSettableItems(_logger, bindingContext);
return(NoDataAvailable);
}
// We want to check to see if any of the properties of the model can be bound using the value providers or
// a greedy binder.
//
// Because a property might specify a custom binding source ([FromForm]), it's not correct
// for us to just try bindingContext.ValueProvider.ContainsPrefixAsync(bindingContext.ModelName);
// that may include other value providers - that would lead us to mistakenly create the model
// when the data is coming from a source we should use (ex: value found in query string, but the
// model has [FromForm]).
//
// To do this we need to enumerate the properties, and see which of them provide a binding source
// through metadata, then we decide what to do.
//
// If a property has a binding source, and it's a greedy source, then it's always bound.
//
// If a property has a binding source, and it's a non-greedy source, then we'll filter the
// the value providers to just that source, and see if we can find a matching prefix
// (see CanBindValue).
//
// If a property does not have a binding source, then it's fair game for any value provider.
//
// Bottom line, if any property meets the above conditions and has a value from ValueProviders, then we'll
// create the model and try to bind it. Of, if ANY properties of the model have a greedy source,
// then we go ahead and create it.
var hasGreedyBinders = false;
for (var i = 0; i < bindingContext.ModelMetadata.Properties.Count; i++)
{
var propertyMetadata = bindingContext.ModelMetadata.Properties[i];
if (!CanBindItem(bindingContext, propertyMetadata))
{
continue;
}
// If any property can be bound from a greedy binding source, then success.
var bindingSource = propertyMetadata.BindingSource;
if (bindingSource != null && bindingSource.IsGreedy)
{
hasGreedyBinders = true;
continue;
}
// Otherwise, check whether the (perhaps filtered) value providers have a match.
var fieldName = propertyMetadata.BinderModelName ?? propertyMetadata.PropertyName;
var modelName = ModelNames.CreatePropertyModelName(bindingContext.ModelName, fieldName);
using (bindingContext.EnterNestedScope(
modelMetadata: propertyMetadata,
fieldName: fieldName,
modelName: modelName,
model: null))
{
// If any property can be bound from a value provider, then success.
if (bindingContext.ValueProvider.ContainsPrefix(bindingContext.ModelName))
{
return(ValueProviderDataAvailable);
}
}
}
if (performsConstructorBinding)
{
var parameters = bindingContext.ModelMetadata.BoundConstructor.BoundConstructorParameters;
for (var i = 0; i < parameters.Count; i++)
{
var parameterMetadata = parameters[i];
if (!CanBindItem(bindingContext, parameterMetadata))
{
continue;
}
// If any parameter can be bound from a greedy binding source, then success.
var bindingSource = parameterMetadata.BindingSource;
if (bindingSource != null && bindingSource.IsGreedy)
{
hasGreedyBinders = true;
continue;
}
// Otherwise, check whether the (perhaps filtered) value providers have a match.
var fieldName = parameterMetadata.BinderModelName ?? parameterMetadata.ParameterName;
var modelName = ModelNames.CreatePropertyModelName(bindingContext.ModelName, fieldName);
using (bindingContext.EnterNestedScope(
modelMetadata: parameterMetadata,
fieldName: fieldName,
modelName: modelName,
model: null))
{
// If any parameter can be bound from a value provider, then success.
if (bindingContext.ValueProvider.ContainsPrefix(bindingContext.ModelName))
{
return(ValueProviderDataAvailable);
}
}
}
}
if (hasGreedyBinders)
{
return(GreedyPropertiesMayHaveData);
}
_logger.CannotBindToComplexType(bindingContext);
return(NoDataAvailable);
}
// Internal for testing.
internal async Task <CollectionResult> BindComplexCollectionFromIndexes(
ModelBindingContext bindingContext,
IEnumerable <string> indexNames)
{
bool indexNamesIsFinite;
if (indexNames != null)
{
indexNamesIsFinite = true;
}
else
{
// Read all form Values
IFormCollection collection = await bindingContext.HttpContext.Request.ReadFormAsync();
List <int> indexValues = GetIndexesForCollection(collection, bindingContext.ModelName);
if (indexValues.Count > 0)
{
indexNamesIsFinite = true;
indexNames = indexValues.Select(i => i.ToString(CultureInfo.InvariantCulture));
}
else
{
indexNamesIsFinite = false;
indexNames = Enumerable.Range(0, int.MaxValue)
.Select(i => i.ToString(CultureInfo.InvariantCulture));
}
}
var elementMetadata = bindingContext.ModelMetadata.ElementMetadata;
var boundCollection = new List <TElement>();
List <TElement> modelList = (List <TElement>)bindingContext.Model;
// The loop where we look for elements of all indexes
foreach (var indexName in indexNames)
{
var fullChildName = ModelNames.CreateIndexModelName(bindingContext.ModelName, indexName);
// Gets the current model for the given Index
TElement currentModel = default(TElement);
int currentModelIndex = Convert.ToInt32(indexName);
if (modelList != null && modelList.Count > currentModelIndex)
{
currentModel = modelList[Convert.ToInt32(indexName)];
}
var didBind = false;
object boundValue = null;
ModelBindingResult?result;
using (bindingContext.EnterNestedScope(
elementMetadata,
fieldName: indexName,
modelName: fullChildName,
model: currentModel))
{
// Call the binder that will bind the complex or simple type of the collection.
await ElementBinder.BindModelAsync(bindingContext);
result = bindingContext.Result;
}
if (result != null && result.Value.IsModelSet)
{
didBind = true;
boundValue = result.Value.Model;
// Add any new element to the current List. Expects that the first new index is first avaiable index.
if (currentModelIndex >= modelList.Count)
{
modelList.Add((TElement)boundValue);
}
}
// infinite size collection stops on first bind failure
if (!didBind && !indexNamesIsFinite)
{
break;
}
boundCollection.Add(CastOrDefault <TElement>(boundValue));
}
return(new CollectionResult
{
Model = boundCollection,
// If we're working with a fixed set of indexes then this is the format like:
//
// ?parameter.index=zero,one,two¶meter[zero]=0&¶meter[one]=1¶meter[two]=2...
//
// We need to provide this data to the validation system so it can 'replay' the keys.
// But we can't just set ValidationState here, because it needs the 'real' model.
ValidationStrategy = indexNamesIsFinite ?
new ExplicitIndexCollectionValidationStrategy(indexNames) :
null,
});
}
private async Task BindModelCoreAsync(ModelBindingContext bindingContext, ViewConfigure viewConfigure)
{
if (bindingContext.Model == null)
{
bindingContext.Model = CreateModel(bindingContext);
}
for (var i = 0; i < bindingContext.ModelMetadata.Properties.Count; i++)
{
var property = bindingContext.ModelMetadata.Properties[i];
if (!CanBindProperty(bindingContext, property))
{
continue;
}
object propertyModel = null;
if (property.PropertyGetter != null &&
property.IsComplexType &&
!property.ModelType.IsArray)
{
propertyModel = property.PropertyGetter(bindingContext.Model);
}
var fieldName = property.BinderModelName ?? property.PropertyName;
var modelName = ModelNames.CreatePropertyModelName(bindingContext.ModelName, fieldName);
ModelBindingResult result;
using (bindingContext.EnterNestedScope(
modelMetadata: property,
fieldName: fieldName,
modelName: modelName,
model: propertyModel))
{
await _modelBinderProviderContext.CreateBinder(property).BindModelAsync(bindingContext);
result = bindingContext.Result;
}
if (result.IsModelSet)
{
SetProperty(bindingContext, modelName, property, result, viewConfigure);
}
else
{
var descriptor = viewConfigure.GetViewPortDescriptor(modelName);
if (descriptor != null && bindingContext.ModelState.ContainsKey(modelName))
{
foreach (var valid in descriptor.Validator)
{
if (!valid.Validate(bindingContext.ModelState[modelName].RawValue))
{
valid.DisplayName = descriptor.DisplayName;
bindingContext.ModelState[modelName].Errors.Clear();
bindingContext.ModelState.TryAddModelError(modelName, valid.ErrorMessage);
break;
}
}
}
else if (property.IsBindingRequired)
{
var message = property.ModelBindingMessageProvider.MissingBindRequiredValueAccessor(fieldName);
bindingContext.ModelState.TryAddModelError(modelName, message);
}
}
}
bindingContext.Result = ModelBindingResult.Success(bindingContext.Model);
}
private async Task BindModelCoreAsync(ModelBindingContext bindingContext)
{
// Create model first (if necessary) to avoid reporting errors about properties when activation fails.
if (bindingContext.Model == null)
{
bindingContext.Model = CreateModel(bindingContext);
}
foreach (var property in bindingContext.ModelMetadata.Properties)
{
if (!CanBindProperty(bindingContext, property))
{
continue;
}
// Pass complex (including collection) values down so that binding system does not unnecessarily
// recreate instances or overwrite inner properties that are not bound. No need for this with simple
// values because they will be overwritten if binding succeeds. Arrays are never reused because they
// cannot be resized.
object propertyModel = null;
if (property.PropertyGetter != null &&
property.IsComplexType &&
!property.ModelType.IsArray)
{
propertyModel = property.PropertyGetter(bindingContext.Model);
}
var fieldName = property.BinderModelName ?? property.PropertyName;
var modelName = ModelNames.CreatePropertyModelName(bindingContext.ModelName, fieldName);
ModelBindingResult result;
using (bindingContext.EnterNestedScope(
modelMetadata: property,
fieldName: fieldName,
modelName: modelName,
model: propertyModel))
{
await BindProperty(bindingContext);
result = bindingContext.Result ?? ModelBindingResult.Failed(modelName);
}
if (result.IsModelSet)
{
SetProperty(bindingContext, property, result);
}
else if (property.IsBindingRequired)
{
var message = property.ModelBindingMessageProvider.MissingBindRequiredValueAccessor(fieldName);
bindingContext.ModelState.TryAddModelError(modelName, message);
}
}
bindingContext.Result = ModelBindingResult.Success(bindingContext.ModelName, bindingContext.Model);
}
/// <inheritdoc />
public override async Task BindModelAsync(ModelBindingContext bindingContext)
{
if (bindingContext == null)
{
throw new ArgumentNullException(nameof(bindingContext));
}
await base.BindModelAsync(bindingContext);
if (!bindingContext.Result.IsModelSet)
{
// No match for the prefix at all.
return;
}
var result = bindingContext.Result;
Debug.Assert(result.Model != null);
var model = (IDictionary <TKey, TValue>)result.Model;
if (model.Count != 0)
{
// ICollection<KeyValuePair<TKey, TValue>> approach was successful.
return;
}
Logger.NoKeyValueFormatForDictionaryModelBinder(bindingContext);
if (!(bindingContext.ValueProvider is IEnumerableValueProvider enumerableValueProvider))
{
// No IEnumerableValueProvider available for the fallback approach. For example the user may have
// replaced the ValueProvider with something other than a CompositeValueProvider.
if (bindingContext.IsTopLevelObject)
{
AddErrorIfBindingRequired(bindingContext);
}
return;
}
// Attempt to bind dictionary from a set of prefix[key]=value entries. Get the short and long keys first.
var prefix = bindingContext.ModelName;
var keys = enumerableValueProvider.GetKeysFromPrefix(prefix);
if (keys.Count == 0)
{
// No entries with the expected keys.
if (bindingContext.IsTopLevelObject)
{
AddErrorIfBindingRequired(bindingContext);
}
return;
}
// Update the existing successful but empty ModelBindingResult.
var elementMetadata = bindingContext.ModelMetadata.ElementMetadata;
var valueMetadata = elementMetadata.Properties[nameof(KeyValuePair <TKey, TValue> .Value)];
var keyMappings = new Dictionary <string, TKey>(StringComparer.Ordinal);
foreach (var kvp in keys)
{
// Use InvariantCulture to convert the key since ExpressionHelper.GetExpressionText() would use
// that culture when rendering a form.
var convertedKey = ModelBindingHelper.ConvertTo <TKey>(kvp.Key, culture: null);
using (bindingContext.EnterNestedScope(
modelMetadata: valueMetadata,
fieldName: bindingContext.FieldName,
modelName: kvp.Value,
model: null))
{
await _valueBinder.BindModelAsync(bindingContext);
var valueResult = bindingContext.Result;
if (!valueResult.IsModelSet)
{
// Factories for IKeyRewriterValueProvider implementations are not all-or-nothing i.e.
// "[key][propertyName]" may be rewritten as ".key.propertyName" or "[key].propertyName". Try
// again in case this scope is binding a complex type and rewriting
// landed on ".key.propertyName" or in case this scope is binding another collection and an
// IKeyRewriterValueProvider implementation was first (hiding the original "[key][next key]").
if (kvp.Value.EndsWith("]"))
{
bindingContext.ModelName = ModelNames.CreatePropertyModelName(prefix, kvp.Key);
}
else
{
bindingContext.ModelName = ModelNames.CreateIndexModelName(prefix, kvp.Key);
}
await _valueBinder.BindModelAsync(bindingContext);
valueResult = bindingContext.Result;
}
// Always add an entry to the dictionary but validate only if binding was successful.
model[convertedKey] = ModelBindingHelper.CastOrDefault <TValue>(valueResult.Model);
keyMappings.Add(bindingContext.ModelName, convertedKey);
}
}
bindingContext.ValidationState.Add(model, new ValidationStateEntry()
{
Strategy = new ShortFormDictionaryValidationStrategy <TKey, TValue>(keyMappings, valueMetadata),
});
}
internal async Task <CollectionResult> BindComplexCollectionFromIndexes(
ModelBindingContext bindingContext,
IEnumerable <string>?indexNames)
{
bool indexNamesIsFinite;
if (indexNames != null)
{
indexNamesIsFinite = true;
}
else
{
indexNamesIsFinite = false;
var limit = _maxModelBindingCollectionSize == int.MaxValue ?
int.MaxValue :
_maxModelBindingCollectionSize + 1;
indexNames = Enumerable
.Range(0, limit)
.Select(i => i.ToString(CultureInfo.InvariantCulture));
}
var elementMetadata = bindingContext.ModelMetadata.ElementMetadata !;
var boundCollection = new List <TElement?>();
foreach (var indexName in indexNames)
{
var fullChildName = ModelNames.CreateIndexModelName(bindingContext.ModelName, indexName);
ModelBindingResult?result;
using (bindingContext.EnterNestedScope(
elementMetadata,
fieldName: indexName,
modelName: fullChildName,
model: null))
{
await ElementBinder.BindModelAsync(bindingContext);
result = bindingContext.Result;
}
var didBind = false;
object?boundValue = null;
if (result != null && result.Value.IsModelSet)
{
didBind = true;
boundValue = result.Value.Model;
}
// infinite size collection stops on first bind failure
if (!didBind && !indexNamesIsFinite)
{
break;
}
boundCollection.Add(ModelBindingHelper.CastOrDefault <TElement>(boundValue));
}
// Did the collection grow larger than the limit?
if (boundCollection.Count > _maxModelBindingCollectionSize)
{
// Look for a non-empty name. Both ModelName and OriginalModelName may be empty at the top level.
var name = string.IsNullOrEmpty(bindingContext.ModelName) ?
(string.IsNullOrEmpty(bindingContext.OriginalModelName) &&
bindingContext.ModelMetadata.MetadataKind != ModelMetadataKind.Type ?
bindingContext.ModelMetadata.Name :
bindingContext.OriginalModelName) : // This name may unfortunately be empty.
bindingContext.ModelName;
throw new InvalidOperationException(Resources.FormatModelBinding_ExceededMaxModelBindingCollectionSize(
name,
nameof(MvcOptions),
nameof(MvcOptions.MaxModelBindingCollectionSize),
_maxModelBindingCollectionSize,
bindingContext.ModelMetadata.ElementType));
}
return(new CollectionResult(boundCollection)
{
// If we're working with a fixed set of indexes then this is the format like:
//
// ?parameter.index=zero¶meter.index=one¶meter.index=two¶meter[zero]=0¶meter[one]=1¶meter[two]=2...
//
// We need to provide this data to the validation system so it can 'replay' the keys.
// But we can't just set ValidationState here, because it needs the 'real' model.
ValidationStrategy = indexNamesIsFinite ?
new ExplicitIndexCollectionValidationStrategy(indexNames) :
null,
});
}
// Internal for testing.
internal async Task <CollectionResult> BindComplexCollectionFromIndexes(
ModelBindingContext bindingContext,
IEnumerable <string> indexNames)
{
bool indexNamesIsFinite;
if (indexNames != null)
{
indexNamesIsFinite = true;
}
else
{
indexNamesIsFinite = false;
indexNames = Enumerable.Range(0, int.MaxValue)
.Select(i => i.ToString(CultureInfo.InvariantCulture));
}
var elementMetadata = bindingContext.ModelMetadata.ElementMetadata;
var boundCollection = new List <TElement>();
foreach (var indexName in indexNames)
{
var fullChildName = ModelNames.CreateIndexModelName(bindingContext.ModelName, indexName);
ModelBindingResult?result;
using (bindingContext.EnterNestedScope(
elementMetadata,
fieldName: indexName,
modelName: fullChildName,
model: null))
{
await ElementBinder.BindModelAsync(bindingContext);
result = bindingContext.Result;
}
var didBind = false;
object boundValue = null;
if (result != null && result.Value.IsModelSet)
{
didBind = true;
boundValue = result.Value.Model;
}
// infinite size collection stops on first bind failure
if (!didBind && !indexNamesIsFinite)
{
break;
}
boundCollection.Add(CastOrDefault <TElement>(boundValue));
}
return(new CollectionResult
{
Model = boundCollection,
// If we're working with a fixed set of indexes then this is the format like:
//
// ?parameter.index=zero¶meter.index=one¶meter.index=two¶meter[zero]=0¶meter[one]=1¶meter[two]=2...
//
// We need to provide this data to the validation system so it can 'replay' the keys.
// But we can't just set ValidationState here, because it needs the 'real' model.
ValidationStrategy = indexNamesIsFinite ?
new ExplicitIndexCollectionValidationStrategy(indexNames) :
null,
});
}
public async Task BindModelAsync(ModelBindingContext bindingContext)
{
if (bindingContext == null)
{
throw new ArgumentNullException(nameof(bindingContext));
}
var itemName = bindingContext.FieldName;
// check if we can get the item from the RouteData
var rvd = bindingContext.ActionContext.RouteData.Values;
if (rvd.ContainsKey(itemName) &&
bindingContext.ModelType.IsAssignableFrom(rvd[itemName].GetType()))
{
bindingContext.Model = rvd[itemName];
if (this.propertyBinders == null || bindingContext.BindingSource != BindingSource.Body)
{
// we aren't meant to bind request data onto the value from RouteData
bindingContext.Result = ModelBindingResult.Success(bindingContext.Model);
return;
}
// Check whether the underlying type of the data is different from the model type
if (rvd[itemName].GetType() != bindingContext.ModelType)
{
// if so recurse on model binding with the underlying model type
var servProv = bindingContext.ActionContext.HttpContext.RequestServices;
var metadataProvider = servProv.GetRequiredService <IModelMetadataProvider>();
var modelMetadata = metadataProvider.GetMetadataForType(bindingContext.Model.GetType());
bindingContext.ModelMetadata = modelMetadata;
var modelBinderFactory = servProv.GetRequiredService <IModelBinderFactory>();
var factoryContext = new ModelBinderFactoryContext()
{
Metadata = modelMetadata,
BindingInfo = new BindingInfo()
{
BinderModelName = modelMetadata.BinderModelName,
BinderType = modelMetadata.BinderType,
BindingSource = modelMetadata.BindingSource,
PropertyFilterProvider = modelMetadata.PropertyFilterProvider,
},
// We're using the model metadata as the cache token here so that TryUpdateModelAsync calls
// for the same model type can share a binder. This won't overlap with normal model binding
// operations because they use the ParameterDescriptor for the token.
CacheToken = modelMetadata
};
var underlyingBinder = modelBinderFactory.CreateBinder(factoryContext);
await underlyingBinder.BindModelAsync(bindingContext);
return;
}
}
if (bindingContext.IsTopLevelObject)
{
// We know we are editing the data, so we empty all collections, as if there
// are no collection items present in the posted data, this means the collection is empty
new ContentBindingPreparer().Visit(bindingContext.Model);
bindingContext.ModelName = "";
}
if (!CanCreateModel(bindingContext))
{
return;
}
//Create model first(if necessary) to avoid reporting errors about properties when activation fails.
//if (bindingContext.Model == null)
//{
// bindingContext.Model = CreateModel(bindingContext);
//}
foreach (var property in bindingContext.ModelMetadata.Properties)
{
if (!CanBindProperty(bindingContext, property))
{
continue;
}
// Pass complex (including collection) values down so that binding system does not unnecessarily
// recreate instances or overwrite inner properties that are not bound. No need for this with simple
// values because they will be overwritten if binding succeeds. Arrays are never reused because they
// cannot be resized.
object propertyModel = null;
if (property.PropertyGetter != null &&
property.IsComplexType &&
!property.ModelType.IsArray)
{
propertyModel = property.PropertyGetter(bindingContext.Model);
}
var fieldName = property.BinderModelName ?? property.PropertyName;
var modelName = ModelNames.CreatePropertyModelName(bindingContext.ModelName, fieldName);
ModelBindingResult result;
using (bindingContext.EnterNestedScope(
modelMetadata: property,
fieldName: fieldName,
modelName: modelName,
model: propertyModel))
{
await BindProperty(bindingContext);
result = bindingContext.Result;
}
if (result.IsModelSet)
{
SetProperty(bindingContext, modelName, property, result);
}
else if (property.IsBindingRequired)
{
var message = property.ModelBindingMessageProvider.MissingBindRequiredValueAccessor(fieldName);
bindingContext.ModelState.TryAddModelError(modelName, message);
}
}
bindingContext.Result = ModelBindingResult.Success(bindingContext.Model);
}
/// <inheritdoc />
public override async Task BindModelAsync(ModelBindingContext bindingContext)
{
if (bindingContext == null)
{
throw new ArgumentNullException(nameof(bindingContext));
}
await base.BindModelAsync(bindingContext);
if (bindingContext.Result == null || !bindingContext.Result.Value.IsModelSet)
{
// No match for the prefix at all.
return;
}
var result = bindingContext.Result.Value;
Debug.Assert(result.Model != null);
var model = (IDictionary <TKey, TValue>)result.Model;
if (model.Count != 0)
{
// ICollection<KeyValuePair<TKey, TValue>> approach was successful.
return;
}
var enumerableValueProvider = bindingContext.ValueProvider as IEnumerableValueProvider;
if (enumerableValueProvider == null)
{
// No IEnumerableValueProvider available for the fallback approach. For example the user may have
// replaced the ValueProvider with something other than a CompositeValueProvider.
return;
}
// Attempt to bind dictionary from a set of prefix[key]=value entries. Get the short and long keys first.
var keys = enumerableValueProvider.GetKeysFromPrefix(bindingContext.ModelName);
if (keys.Count == 0)
{
// No entries with the expected keys.
return;
}
// Update the existing successful but empty ModelBindingResult.
var elementMetadata = bindingContext.ModelMetadata.ElementMetadata;
var valueMetadata = elementMetadata.Properties[nameof(KeyValuePair <TKey, TValue> .Value)];
var keyMappings = new Dictionary <string, TKey>(StringComparer.Ordinal);
foreach (var kvp in keys)
{
// Use InvariantCulture to convert the key since ExpressionHelper.GetExpressionText() would use
// that culture when rendering a form.
var convertedKey = ModelBindingHelper.ConvertTo <TKey>(kvp.Key, culture: null);
using (bindingContext.EnterNestedScope(
modelMetadata: valueMetadata,
fieldName: bindingContext.FieldName,
modelName: kvp.Value,
model: null))
{
await _valueBinder.BindModelAsync(bindingContext);
var valueResult = bindingContext.Result;
// Always add an entry to the dictionary but validate only if binding was successful.
model[convertedKey] = ModelBindingHelper.CastOrDefault <TValue>(valueResult.Value.Model);
keyMappings.Add(kvp.Key, convertedKey);
}
}
bindingContext.ValidationState.Add(model, new ValidationStateEntry()
{
Strategy = new ShortFormDictionaryValidationStrategy <TKey, TValue>(keyMappings, valueMetadata),
});
}
private bool CanValueBindAnyModelProperties(ModelBindingContext bindingContext)
{
// If there are no properties on the model, there is nothing to bind. We are here means this is not a top
// level object. So we return false.
if (bindingContext.ModelMetadata.Properties.Count == 0)
{
return false;
}
// We want to check to see if any of the properties of the model can be bound using the value providers,
// because that's all that MutableObjectModelBinder can handle.
//
// However, because a property might specify a custom binding source ([FromForm]), it's not correct
// for us to just try bindingContext.ValueProvider.ContainsPrefixAsync(bindingContext.ModelName),
// because that may include other value providers - that would lead us to mistakenly create the model
// when the data is coming from a source we should use (ex: value found in query string, but the
// model has [FromForm]).
//
// To do this we need to enumerate the properties, and see which of them provide a binding source
// through metadata, then we decide what to do.
//
// If a property has a binding source, and it's a greedy source, then it's not
// allowed to come from a value provider, so we skip it.
//
// If a property has a binding source, and it's a non-greedy source, then we'll filter the
// the value providers to just that source, and see if we can find a matching prefix
// (see CanBindValue).
//
// If a property does not have a binding source, then it's fair game for any value provider.
//
// If any property meets the above conditions and has a value from valueproviders, then we'll
// create the model and try to bind it. OR if ALL properties of the model have a greedy source,
// then we go ahead and create it.
//
var hasBindableProperty = false;
var isAnyPropertyEnabledForValueProviderBasedBinding = false;
foreach (var propertyMetadata in bindingContext.ModelMetadata.Properties)
{
if (!CanBindProperty(bindingContext, propertyMetadata))
{
continue;
}
hasBindableProperty = true;
// This check will skip properties which are marked explicitly using a non value binder.
var bindingSource = propertyMetadata.BindingSource;
if (bindingSource == null || !bindingSource.IsGreedy)
{
isAnyPropertyEnabledForValueProviderBasedBinding = true;
var fieldName = propertyMetadata.BinderModelName ?? propertyMetadata.PropertyName;
var modelName = ModelNames.CreatePropertyModelName(
bindingContext.ModelName,
fieldName);
using (bindingContext.EnterNestedScope(
modelMetadata: propertyMetadata,
fieldName: fieldName,
modelName: modelName,
model: null))
{
// If any property can return a true value.
if (CanBindValue(bindingContext))
{
return true;
}
}
}
}
if (hasBindableProperty && !isAnyPropertyEnabledForValueProviderBasedBinding)
{
// All the properties are marked with a non value provider based marker like [FromHeader] or
// [FromBody].
return true;
}
return false;
}
