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我试图获取并设置 Json，但在“endgetresponse”上有一个例外：

   public void GetSetJsonString (string message)
        {
        this.message = message; 
        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(myurl);
        request.ContentType = "application/json; charset=utf-8";
        request.Accept = "application/json";
        request.Method = "POST";
        request.CookieContainer = new CookieContainer();
        request.CookieContainer.Add(myurl, myfirstcookie);
        request.CookieContainer.Add(myurl, mysecondcookie);
        request.BeginGetRequestStream(new AsyncCallback(GetRequestStreamCallback), request);

    }
    private void GetRequestStreamCallback(IAsyncResult asynchronousResult)
    {
        HttpWebRequest request = (HttpWebRequest)asynchronousResult.AsyncState;
        Stream postStream = request.EndGetRequestStream(asynchronousResult);
        byte[] byteArray = Encoding.UTF8.GetBytes(message);
        postStream.Write(byteArray, 0, byteArray.Length);
        postStream.Close();
        request.BeginGetResponse(new AsyncCallback(GetResponseCallback), request);
    }

    private void GetResponseCallback(IAsyncResult asynchronousResult)
    {
        HttpWebRequest request = (HttpWebRequest)asynchronousResult.AsyncState;
        HttpWebResponse response = (HttpWebResponse)request.EndGetResponse(asynchronousResult);
        Stream streamResponse = response.GetResponseStream();
        StreamReader streamRead = new StreamReader(streamResponse);
        string answer = streamRead.ReadToEnd();
        streamResponse.Close();
        streamRead.Close();
    }
}

就行了 HttpWebResponse response = (HttpWebResponse)request.EndGetResponse(asynchronousResult);

我得到了这个例外：

{System.Net.WebException：远程服务器返回错误：NotFound。---> System.Net.WebException：远程服务器返回错误：NotFound。在 System.Net.Browser.ClientHttpWebRequest.InternalEndGetResponse(IAsyncResult asyncResult) 在 System.Net.Browser.ClientHttpWebRequest.<>c_ DisplayClasse.b _d(Object sendState) 在 System.Net.Browser.AsyncHelper.<>c_ DisplayClass1.b _0 (Object sendState) --- 内部异常堆栈跟踪结束 --- 在 System.Net.Browser.AsyncHelper.BeginOnUI(SendOrPostCallback beginMethod, Object state) 在 System.Net.Browser.ClientHttpWebRequest.EndGetResponse(IAsyncResult asyncResult) 在项目。 System.Net.Browser.ClientHttpWebRequest.<>c_DisplayClass1d 处的 GetSetJson.GetResponseCallback(IAsyncResult asynchronousResult) 。_1b（对象状态2）}

奇怪的是，当我作为错误发送的 Json 消息时，我没有出现异常，并且我收到了来自服务器的错误消息。

您知道我为什么会出现此异常以及如何解决此问题吗？

非常坦克你！

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