protected virtual object CreateModel(IndexModelBindingContext bindingContext)
{
if (bindingContext == null)
{
throw new ArgumentNullException(nameof(bindingContext));
}
if (_modelCreator == null)
{
var modelTypeInfo = bindingContext.ModelType.GetTypeInfo();
if (modelTypeInfo.IsAbstract || modelTypeInfo.GetConstructor(Type.EmptyTypes) == null)
{
if (bindingContext.IsTopLevelObject)
{
throw new InvalidOperationException($"{modelTypeInfo.FullName} - NoParameterlessConstructor-TopLevelObject");
}
throw new InvalidOperationException($"{modelTypeInfo.FullName},{bindingContext.ModelName},{bindingContext.ModelMetadata.ContainerType.FullName}, " +
$"NoParameterlessConstructor_ForProperty");
}
_modelCreator = Expression
.Lambda <Func <object> >(Expression.New(bindingContext.ModelType))
.Compile();
}
return(_modelCreator());
}
protected virtual bool CanBindProperty(IndexModelBindingContext bindingContext, ModelMetadata propertyMetadata)
{
var metadataProviderFilter = bindingContext.ModelMetadata.PropertyFilterProvider?.PropertyFilter;
if (metadataProviderFilter?.Invoke(propertyMetadata) == false)
{
return(false);
}
if (bindingContext.PropertyFilter?.Invoke(propertyMetadata) == false)
{
return(false);
}
if (!propertyMetadata.IsBindingAllowed)
{
return(false);
}
if (!CanUpdatePropertyInternal(propertyMetadata))
{
return(false);
}
return(true);
}
// Used when the ValueProvider contains the collection to be bound as multiple elements, e.g. foo[0], foo[1].
private Task <CollectionResult> BindComplexCollection(IndexModelBindingContext bindingContext)
{
var indexPropertyName = ModelNames.CreatePropertyModelName(bindingContext.ModelName, "index");
var valueProviderResultIndex = bindingContext.ValueProvider.GetValue(indexPropertyName);
var indexNames = GetIndexNamesFromValueProviderResult(valueProviderResultIndex);
return(BindComplexCollectionFromIndexes(bindingContext, indexNames));
}
private async Task BindModelCoreAsync(IndexModelBindingContext bindingContext)
{
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 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);
}
private bool CanValueBindAnyModelProperties(IndexModelBindingContext 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 Task BindModelAsync(IndexModelBindingContext bindingContext)
{
if (bindingContext == null)
{
throw new ArgumentNullException(nameof(bindingContext));
}
if (!CanCreateModel(bindingContext))
{
return(Task.CompletedTask);
}
return(BindModelCoreAsync(bindingContext));
}
protected virtual void SetProperty(
IndexModelBindingContext bindingContext,
string modelName,
ModelMetadata propertyMetadata,
ModelBindingResult result)
{
if (bindingContext == null)
{
throw new ArgumentNullException(nameof(bindingContext));
}
if (modelName == null)
{
throw new ArgumentNullException(nameof(modelName));
}
if (propertyMetadata == null)
{
throw new ArgumentNullException(nameof(propertyMetadata));
}
if (!result.IsModelSet)
{
return;
}
if (propertyMetadata.IsReadOnly)
{
return;
}
var value = result.Model;
try
{
propertyMetadata.PropertySetter(bindingContext.Model, value);
}
catch (Exception exception)
{
AddModelError(exception, modelName, bindingContext);
}
}
private static void AddModelError(
Exception exception,
string modelName,
IndexModelBindingContext bindingContext)
{
var targetInvocationException = exception as TargetInvocationException;
if (targetInvocationException?.InnerException != null)
{
exception = targetInvocationException.InnerException;
}
var modelState = bindingContext.ModelState;
var validationState = modelState.GetFieldValidationState(modelName);
if (validationState == ModelValidationState.Unvalidated)
{
modelState.AddModelError(modelName, exception, bindingContext.ModelMetadata);
}
}
internal async Task <CollectionResult> BindSimpleCollection(
IndexModelBindingContext 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
};
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(IndexModelBinderHelper.CastOrDefault <TElement>(boundValue));
}
}
}
return(new CollectionResult
{
Model = boundCollection
});
}
internal bool CanCreateModel(IndexModelBindingContext bindingContext)
{
var isTopLevelObject = bindingContext.IsTopLevelObject;
var bindingSource = bindingContext.BindingSource;
if (!isTopLevelObject && bindingSource != null && bindingSource.IsGreedy)
{
return(false);
}
if (isTopLevelObject)
{
return(true);
}
if (CanValueBindAnyModelProperties(bindingContext))
{
return(true);
}
return(false);
}
public Task BindModelAsync(IndexModelBindingContext bindingContext)
{
return(Inner.BindModelAsync(bindingContext));
}
public Task BindModelAsync(IndexModelBindingContext bindingContext)
{
return(Task.CompletedTask);
}
public NestedScope(IndexModelBindingContext context)
{
_context = context;
}
public Task BindModelAsync(IndexModelBindingContext bindingContext)
{
if (bindingContext == null)
{
throw new ArgumentNullException(nameof(bindingContext));
}
var valueProviderResult = bindingContext.ValueProvider.GetValue(bindingContext.ModelName);
if (valueProviderResult == ValueProviderResult.None)
{
// no entry
return(Task.CompletedTask);
}
bindingContext.ModelState.SetModelValue(bindingContext.ModelName, valueProviderResult);
try
{
var value = valueProviderResult.FirstValue;
object model;
if (bindingContext.ModelType == typeof(string))
{
if (bindingContext.ModelMetadata.ConvertEmptyStringToNull && string.IsNullOrWhiteSpace(value))
{
model = null;
}
else
{
model = value;
}
}
else if (string.IsNullOrWhiteSpace(value))
{
model = null;
}
else
{
model = _typeConverter.ConvertFrom(
context: null,
culture: valueProviderResult.Culture,
value: value);
}
if (model == null && !bindingContext.ModelMetadata.IsReferenceOrNullableType)
{
bindingContext.ModelState.TryAddModelError(
bindingContext.ModelName,
bindingContext.ModelMetadata.ModelBindingMessageProvider.ValueMustNotBeNullAccessor(
valueProviderResult.ToString()));
return(Task.CompletedTask);
}
else
{
bindingContext.Result = ModelBindingResult.Success(model);
return(Task.CompletedTask);
}
}
catch (Exception exception)
{
var isFormatException = exception is FormatException;
if (!isFormatException && exception.InnerException != null)
{
exception = ExceptionDispatchInfo.Capture(exception.InnerException).SourceException;
}
bindingContext.ModelState.TryAddModelError(
bindingContext.ModelName,
exception,
bindingContext.ModelMetadata);
return(Task.CompletedTask);
}
}
internal async Task <CollectionResult> BindComplexCollectionFromIndexes(
IndexModelBindingContext 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);
var didBind = false;
object boundValue = null;
ModelBindingResult?result;
using (bindingContext.EnterNestedScope(
elementMetadata,
fieldName: indexName,
modelName: fullChildName,
model: null))
{
await ElementBinder.BindModelAsync(bindingContext);
result = bindingContext.Result;
}
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(IndexModelBinderHelper.CastOrDefault <TElement>(boundValue));
}
return(new CollectionResult
{
Model = boundCollection,
ValidationStrategy = indexNamesIsFinite ?
new ExplicitIndexCollectionValidationStrategy(indexNames) :
null,
});
}
public virtual async Task BindModelAsync(IndexModelBindingContext bindingContext)
{
if (bindingContext == null)
{
throw new ArgumentNullException(nameof(bindingContext));
}
var model = bindingContext.Model;
if (!bindingContext.ValueProvider.ContainsPrefix(bindingContext.ModelName))
{
if (bindingContext.IsTopLevelObject)
{
if (model == null)
{
model = CreateEmptyCollection(bindingContext.ModelType);
}
bindingContext.Result = ModelBindingResult.Success(model);
}
return;
}
var valueProviderResult = bindingContext.ValueProvider.GetValue(bindingContext.ModelName);
CollectionResult result;
if (valueProviderResult == ValueProviderResult.None)
{
result = await BindComplexCollection(bindingContext);
}
else
{
result = await BindSimpleCollection(bindingContext, valueProviderResult);
}
var boundCollection = result.Model;
if (model == null)
{
model = ConvertToCollectionType(bindingContext.ModelType, boundCollection);
}
else
{
CopyToModel(model, boundCollection);
}
Debug.Assert(model != null);
if (result.ValidationStrategy != null)
{
bindingContext.ValidationState.Add(model, new ValidationStateEntry()
{
Strategy = result.ValidationStrategy,
});
}
if (valueProviderResult != ValueProviderResult.None)
{
bindingContext.ModelState.SetModelValue(
bindingContext.ModelName,
valueProviderResult);
}
bindingContext.Result = ModelBindingResult.Success(model);
}
protected virtual Task BindProperty(IndexModelBindingContext bindingContext)
{
var binder = _propertyBinders[bindingContext.ModelMetadata];
return(binder.BindModelAsync(bindingContext));
}
