Question

我正在使用Rest API更新force.com上的db表。我发布json数据来更新这样的db表。

     // preparing webrequest
      HttpWebRequest request = (HttpWebRequest)WebRequest.Create(uri);

      // adding request headers
      request.ContentType = "application/json";
      request.Headers["Authorization"] = "OAuth " + token;
      request.Headers["X-PrettyPrint"] = "1";
      // request method
      request.Method = "PATCH";
       // start the asynchronous operation
                request.BeginGetRequestStream(new AsyncCallback(SaveBeginGetRequestStreamCallBack), request);


 private void SaveBeginGetRequestStreamCallBack(IAsyncResult ar)
        {

            HttpWebRequest webRequest = (HttpWebRequest)ar.AsyncState;

            Stream postStream = webRequest.EndGetRequestStream(ar);

            (using (StreamWriter sw = new StreamWriter(postStream))
            {
                 sw.Write(postData);
                // postData is in json format like: {"Name":"Michel"}  
            }

           postStream.close(); 
            webRequest.BeginGetResponse(new AsyncCallback(SaveBeginGetResponseCallback), webRequest);
        }

        private void SaveBeginGetResponseCallback(IAsyncResult ar)
        {

            try
            {
                HttpWebRequest webRequest = (HttpWebRequest)ar.AsyncState;
                HttpWebResponse response;

                // End the get response operation
                response = (HttpWebResponse)webRequest.EndGetResponse(ar);
                Stream streamResponse = response.GetResponseStream();
                StreamReader streamReader = new StreamReader(streamResponse);
                string Response = streamReader.ReadToEnd();
                streamResponse.Close();
                streamReader.Close();
                response.Close();

            }
            catch (WebException e)
            {
                MessageBox.Show(e.Message);
                // Error treatment

            }

但它显示错误的请求错误。这是通过http请求发送json格式的正确方法。

Answer 1

在调用BeginGetResponse ...

之前，您没有关闭/处置postStream

另外，请致电

sw.Write(data);

由于数据是一个字符串。您的调用（传递偏移量和计数）适用于字节数组。您实际上正在调用格式化重载http://msdn.microsoft.com/en-us/library/fd857wct(v=VS.96).aspx

使用来自WP7的webReuest，使用Rest APi POST json

1 个答案: