返回“允许” WCF Web API 中带有 HTTPResponseMessage 的实体标头

Question

我试图在响应消息中返回“允许”实体标头，但不断收到以下消息：

{“无法添加标头。请确保将请求标头添加到 HttpRequestMessage，将响应标头添加到 HttpResponseMessage，将内容标头添加到HttpContent 对象。"}

这是代码片段：

 [WebInvoke(UriTemplate = "{id}", Method = "DELETE")]
        public HttpResponseMessage<Order> DeleteOrder(int id)
        {
            HttpResponseMessage<Order> response = null;

            try
            {
                if (id <= 0)
                {
                    response = new HttpResponseMessage<Order>(HttpStatusCode.BadRequest);
                }
                else
                {
                    // For brevity, I'm assuming that order - 123456 was already served and logged. Hence it cannot
                    // be deleted. Order 12345, however, can be deleted.
                    // Note: The code doesn't actual delete anything. This is just a demonstration of
                    // the DELETE verb
                    if (id == 12345)
                    {                      
                        return new HttpResponseMessage<Order>(HttpStatusCode.NoContent);
                    }

                    if (id == 123456)
                    {                       
                        response = new HttpResponseMessage<Order>(HttpStatusCode.MethodNotAllowed);
                        response.Headers.AddWithoutValidation("Allow", "PUT");
                    }

                    // return '404 - Not Found' status code
                    response = new HttpResponseMessage<Order>(HttpStatusCode.NotFound);

                }

                return response;
            }
            catch (Exception ex)
            {
                return response = new HttpResponseMessage<Order>(HttpStatusCode.InternalServerError);
            }
        }

任何建议都会非常有帮助。

谢谢，

多尔曼

Answer 1

尝试使用response.Content.Headers 代替。