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// Copyright (c) Microsoft Corporation. All rights reserved. See License.txt in the project root for license information.
using System.ComponentModel;
using System.Web.Http;
namespace System.Net.Http
{
[EditorBrowsable(EditorBrowsableState.Never)]
public static class HttpResponseMessageExtensions
{
/// <summary>
/// Attempts to retrieve a strongly-typed value from a <paramref name="response"/>.
/// </summary>
/// <remarks>
/// If <see cref="HttpResponseMessage.Content"/> is an instance of <see cref="ObjectContent"/>
/// attempts to retrieve the <see cref="ObjectContent.Value"/> if it is compatible with <typeparamref name="T"/>.
/// If it is it returns <c>true</c> and sets <paramref name="value"/>. If not it returns <c>false</c> and
/// sets <paramref name="value"/> to the default instance of <typeparamref name="T"/>.
/// </remarks>
/// <typeparam name="T">The type of the value to retrieve.</typeparam>
/// <param name="response">The response.</param>
/// <param name="value">Will contain the retrieved value if this method succeeds.</param>
/// <returns>Returns <c>true</c> if the response has a content with a value that can be cast to <typeparamref name="T"/>,
/// <c>false</c> otherwise.</returns>
public static bool TryGetContentValue<T>(this HttpResponseMessage response, out T value)
{
if (response == null)
{
throw Error.ArgumentNull("response");
}
ObjectContent content = response.Content as ObjectContent;
if (content != null)
{
if (content.Value is T)
{
value = (T)content.Value;
return true;
}
}
value = default(T);
return false;
}
/// <summary>
/// Attaches the given <paramref name="request"/> to the <paramref name="response"/> if the response does not already
/// have a pointer to a request.
/// </summary>
/// <param name="response">The response.</param>
/// <param name="request">The request.</param>
internal static void EnsureResponseHasRequest(this HttpResponseMessage response, HttpRequestMessage request)
{
if (response != null && response.RequestMessage == null)
{
response.RequestMessage = request;
}
}
}
}
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