private static HttpContext GetHttpContext(HttpRequestMessage request)
{
var context = request.GetProperty <HttpContext>(nameof(HttpContext));
if (context == null)
{
var message = ShimResources.FormatHttpRequestMessage_MustHaveHttpContext(
nameof(HttpRequestMessage),
"HttpRequestMessageHttpContextExtensions.GetHttpRequestMessage");
throw new InvalidOperationException(message);
}
return(context);
}
/// <summary>
/// Helper method that creates a <see cref="HttpResponseMessage"/> with an <see cref="ObjectContent{T}"/>
/// instance containing the provided <paramref name="value"/>. The given <paramref name="mediaType"/> is used
/// to find an instance of <see cref="MediaTypeFormatter"/>.
/// </summary>
/// <typeparam name="T">The type of the value.</typeparam>
/// <param name="request">The request.</param>
/// <param name="statusCode">The status code of the created response.</param>
/// <param name="value">The value to wrap. Can be <c>null</c>.</param>
/// <param name="mediaType">
/// The media type used to look up an instance of <see cref="MediaTypeFormatter"/>.
/// </param>
/// <returns>A response wrapping <paramref name="value"/> with <paramref name="statusCode"/>.</returns>
public static HttpResponseMessage CreateResponse <T>(
this HttpRequestMessage request,
HttpStatusCode statusCode,
T value,
MediaTypeHeaderValue mediaType)
{
if (request == null)
{
throw new ArgumentNullException(nameof(request));
}
if (value == null)
{
throw new ArgumentNullException(nameof(value));
}
if (mediaType == null)
{
throw new ArgumentNullException(nameof(mediaType));
}
var context = GetHttpContext(request);
// Get the default formatters from options
var options = context.RequestServices.GetRequiredService <IOptions <WebApiCompatShimOptions> >();
var formatters = options.Value.Formatters;
var formatter = formatters.FindWriter(typeof(T), mediaType);
if (formatter == null)
{
var message = ShimResources.FormatHttpRequestMessage_CouldNotFindMatchingFormatter(
mediaType.ToString(),
value.GetType());
throw new InvalidOperationException(message);
}
return(request.CreateResponse(statusCode, value, formatter, mediaType));
}
