WCF Post/WebRequest 工作 - WebClient 不

Question

我有一个 WCF 服务声明如下:

[OperationContract, XmlSerializerFormat]
[WebInvoke(UriTemplate = "ProessUpload",
   BodyStyle = WebMessageBodyStyle.Bare,
   RequestFormat = WebMessageFormat.Xml)]
void ProcessUpload(ProductConfig stream);

我正在尝试使用 WebClient 调用此服务，但我总是从服务器收到响应 400 (BadRequest)。但是，如果我使用 HttpWebRequest，WCF 会使用我的帖子并正确响应 200。我还能够使用 Fiddler 成功构建请求以调用 WCF 服务。

网络客户端代码

WebClient webClient = new WebClient();
webClient.Headers.Add("Content-Type", "application/xml");//; charset=utf-8
try
{
  string result = webClient.UploadString("http://jeff-laptop/SalesAssist.ImageService/Process", "POST", data2);
}
  catch (Exception ex)
{
  var e = ex.InnerException;
}

HttpWebRequest代码

HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://jeff-laptop/SalesAssist.ImageService/Process");
request.ContentType = "application/xml";
request.Method = "POST";
request.KeepAlive = true;

using (Stream requestStream = request.GetRequestStream())
{
  var bytes = Encoding.UTF8.GetBytes(data2);
  requestStream.Write(bytes, 0, bytes.Length);
  requestStream.Close();
}

var response = (HttpWebResponse)request.GetResponse();
var abc = new StreamReader(response.GetResponseStream()).ReadToEnd();

正在发送的 XML

var data2 = @"<Product><Sku>3327</Sku><NameProduct</Name><Category>Bumper</Category><Brand Id='3'><Collection>14</Collection></Brand></Product>";

为什么 HttpWebRequest 有效而 WebClient 无效？我看不到通过 Fiddler 发送的 header 有什么真正的区别。

Answer 1

尝试设置 Encoding在发送字符串之前 WebClient 上的属性。由于您没有指定它，我怀疑它默认为 ASCII。引用自 UploadString reference page .

Before uploading the string, this method converts it to a Byte array using the encoding specified in the Encoding property. This method blocks while the string is transmitted. To send a string and continue executing while waiting for the server's response, use one of the UploadStringAsync methods.

 webClient.Encoding = Encoding.UTF8;