// 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
});
}
// 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,
});
}
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,
});
}