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 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,
});
}
