Question

我正在使用“发布”方法，因此我可以发送自定义对象。但是我一直在request.BeginGetResponse（）：

上得到以下异常

{System.Net.ProtocolViolationException：由于对象的当前状态，操作无效。在System.Net.Browser.BrowserHttpWebRequest.BeginGetResponseImplementation（）}

public void Send()
    {
        HttpWebRequest client = WebRequest.Create(new Uri(BaseUrl)) as HttpWebRequest;
        client.Method = "POST";
        client.ContentLength = MaxSerializationSize;
        client.BeginGetRequestStream(new AsyncCallback(RequestProceed), client);
    }

    private void RequestProceed(IAsyncResult asuncResult)
    {
        HttpWebRequest request = (HttpWebRequest) asuncResult.AsyncState;

        StreamWriter postDataWriter = new StreamWriter(request.EndGetRequestStream(asuncResult));
        MemoryStream ms = new MemoryStream();
        DataContractJsonSerializer ser = new     DataContractJsonSerializer(typeof(MyCustomClass));
        ser.WriteObject(ms, MyCustomClassObject);
        postDataWriter.Write(ms);
        postDataWriter.Close();

        request.BeginGetResponse(new AsyncCallback(ResponceProceed), request);

    }

    private void ResponceProceed(IAsyncResult asuncResult)
    {
        var request = (HttpWebRequest) asuncResult.AsyncState;

        using (var resp = (HttpWebResponse) request.EndGetResponse(asuncResult))
        {
            using (var stream = resp.GetResponseStream())
            {
            }
        }
    }

我已经尝试了很多方法让它发挥作用。希望有人能告诉我哪里出错了。谢谢。

Answer 1

您需要关闭请求流。您只是关闭StreamWriter而不是基础请求流。当你在它时，消除了超级MemoryStream并让DataContractJsonSerializer直接写入请求流。

 HttpWebRequest request = (HttpWebRequest) asuncResult.AsyncState;

 using (Stream outStream = request.EndGetRequestStream(asyncResult));
 {
      DataContractJsonSerializer ser = new     DataContractJsonSerializer(typeof(MyCustomClass));           
      ser.WriteObject(outStream, MyCustomClassObject);
      outStream.Flush();
      outStream.Close();
 }

 request.BeginGetResponse(new AsyncCallback(ResponceProceed), request);

也摆脱这一行： -

 client.ContentLength = MaxSerializationSize;

在不关闭AllowWriteStreamBuffering的情况下（只有在ClientHTTP实施时才可以），无需设置ContentLength，这是为您完成的。

Silverlight - 尝试POST到webservice时出现异常

1 个答案: