返回在WCF的Web API與HTTPResponseMessage「允許」實體頭

Question

我想響應消息中返回的「允許」實體頭，我不斷收到以下消息：

{「不能添加頁眉。確保請求頭到HttpRequestMessage，響應頭到HttpResponseMessage和內容頭添加到HttpContent對象「}

下面的代碼片段：

[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); 
      } 
     } 

任何意見將是非常有益的。

感謝，

多爾曼

Answer 1

嘗試response.Content.Headers代替。