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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.ComponentModel;
using System.Linq;
using System.Web.Http.Metadata;
using System.Web.Http.ModelBinding;
using System.Web.Http.Properties;
using System.Web.Http.Validation;
namespace System.Web.Http.Controllers
{
/// <summary>
/// Extension methods for <see cref="HttpActionContext"/>.
/// </summary>
[EditorBrowsable(EditorBrowsableState.Never)]
public static class HttpActionContextExtensions
{
/// <summary>
/// Gets the <see cref="ModelMetadataProvider"/> instance for a given <see cref="HttpActionContext"/>.
/// </summary>
/// <param name="actionContext">The context.</param>
/// <returns>An <see cref="ModelMetadataProvider"/> instance.</returns>
public static ModelMetadataProvider GetMetadataProvider(this HttpActionContext actionContext)
{
if (actionContext == null)
{
throw Error.ArgumentNull("actionContext");
}
return actionContext.ControllerContext.Configuration.Services.GetModelMetadataProvider();
}
/// <summary>
/// Gets the collection of registered <see cref="ModelValidatorProvider"/> instances.
/// </summary>
/// <param name="actionContext">The context.</param>
/// <returns>A collection of <see cref="ModelValidatorProvider"/> instances.</returns>
public static IEnumerable<ModelValidatorProvider> GetValidatorProviders(this HttpActionContext actionContext)
{
if (actionContext == null)
{
throw Error.ArgumentNull("actionContext");
}
return actionContext.ControllerContext.Configuration.Services.GetModelValidatorProviders();
}
/// <summary>
/// Gets the collection of registered <see cref="ModelValidator"/> instances.
/// </summary>
/// <param name="actionContext">The context.</param>
/// <param name="metadata">The metadata.</param>
/// <returns>A collection of registered <see cref="ModelValidator"/> instances.</returns>
public static IEnumerable<ModelValidator> GetValidators(this HttpActionContext actionContext, ModelMetadata metadata)
{
if (actionContext == null)
{
throw Error.ArgumentNull("actionContext");
}
IEnumerable<ModelValidatorProvider> validatorProviders = GetValidatorProviders(actionContext);
return validatorProviders.SelectMany(provider => provider.GetValidators(metadata, validatorProviders));
}
/// <summary>
/// Gets the <see cref="ModelBindingContext"/> for this <see cref="HttpActionContext"/>.
/// </summary>
/// <param name="actionContext">The action context.</param>
/// <param name="bindingContext">The binding context.</param>
/// <param name="binder">When this method returns, the value associated with the specified binding context, if the context is found; otherwise, the default value for the type of the value parameter.</param>
/// <returns><c>true</c> if <see cref="ModelBindingContext"/> was present; otherwise <c>false</c>.</returns>
public static bool TryGetBinder(this HttpActionContext actionContext, ModelBindingContext bindingContext, out IModelBinder binder)
{
if (actionContext == null)
{
throw Error.ArgumentNull("actionContext");
}
if (bindingContext == null)
{
throw Error.ArgumentNull("bindingContext");
}
binder = null;
ModelBinderProvider providerFromAttr;
if (ModelBindingHelper.TryGetProviderFromAttributes(bindingContext.ModelType, out providerFromAttr))
{
binder = providerFromAttr.GetBinder(actionContext, bindingContext);
}
else
{
binder = actionContext.ControllerContext.Configuration.Services.GetModelBinderProviders()
.Select(p => p.GetBinder(actionContext, bindingContext))
.Where(b => b != null)
.FirstOrDefault();
}
return binder != null;
}
/// <summary>
/// Gets the <see cref="ModelBindingContext"/> for this <see cref="HttpActionContext"/>.
/// </summary>
/// <param name="actionContext">The execution context.</param>
/// <param name="bindingContext">The binding context.</param>
/// <returns>The <see cref="ModelBindingContext"/>.</returns>
public static IModelBinder GetBinder(this HttpActionContext actionContext, ModelBindingContext bindingContext)
{
if (actionContext == null)
{
throw Error.ArgumentNull("actionContext");
}
IModelBinder binder;
if (TryGetBinder(actionContext, bindingContext, out binder))
{
return binder;
}
throw Error.InvalidOperation(SRResources.ModelBinderProviderCollection_BinderForTypeNotFound, bindingContext.ModelType);
}
}
}
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