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// Copyright (c) Microsoft Corporation. All rights reserved. See License.txt in the project root for license information.
using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
using System.Linq;
using System.Web.Http.ModelBinding.Binders;
using System.Web.Http.Properties;
using System.Web.Http.ValueProviders;
namespace System.Web.Http.ModelBinding
{
/// <summary>
/// Specify this parameter uses a model binder. This can optionally specify the specific model binder and
/// value providers that drive that model binder.
/// Derived attributes may provide convenience settings for the model binder or value provider.
/// </summary>
[SuppressMessage("Microsoft.Design", "CA1019:DefineAccessorsForAttributeArguments", Justification = "want constructor argument shortcut")]
[SuppressMessage("Microsoft.Performance", "CA1813:AvoidUnsealedAttributes", Justification = "part of a class hierarchy")]
[AttributeUsage(AttributeTargets.Class | AttributeTargets.Parameter, Inherited = true, AllowMultiple = false)]
public class ModelBinderAttribute : Attribute
{
public ModelBinderAttribute()
: this(null)
{
}
public ModelBinderAttribute(Type binderType)
{
BinderType = binderType;
}
/// <summary>
/// Sets the type of the model binder.
/// This type must be a subclass of <see cref="ModelBinderProvider"/>
/// If null, uses the default from the configuration.
/// </summary>
public Type BinderType { get; set; }
/// <summary>
/// Gets or sets the name to consider as the parameter name during model binding
/// </summary>
public string Name { get; set; }
public bool SuppressPrefixCheck { get; set; }
// This will get called by a parameter binding, which will cache the results.
public ModelBinderProvider GetModelBinderProvider(HttpConfiguration configuration)
{
if (BinderType != null)
{
object value = configuration.DependencyResolver.GetService(BinderType)
?? Activator.CreateInstance(BinderType);
if (value != null)
{
VerifyBinderType(value.GetType());
ModelBinderProvider result = (ModelBinderProvider)value;
return result;
}
}
// Create default over config
IEnumerable<ModelBinderProvider> providers = configuration.Services.GetModelBinderProviders();
if (providers.Count() == 1)
{
return providers.First();
}
return new CompositeModelBinderProvider(providers);
}
/// <summary>
/// Value providers that will be fed to the model binder.
/// </summary>
public virtual IEnumerable<ValueProviderFactory> GetValueProviderFactories(HttpConfiguration configuration)
{
// By default, just get all registered value provider factories
return configuration.Services.GetValueProviderFactories();
}
private static void VerifyBinderType(Type attemptedType)
{
Type required = typeof(ModelBinderProvider);
if (!required.IsAssignableFrom(attemptedType))
{
throw Error.InvalidOperation(SRResources.ValueProviderFactory_Cannot_Create, required.Name, attemptedType.Name, required.Name);
}
}
}
}
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