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我正在开发一个移动应用程序，从中我将包含用于用户身份验证的 XML 的 HTTP POST 请求发送到基于 PHP 的 Web 服务。

在方法中接收来自 Web 服务的响应GetResponseCallback(IAsyncResult asynchronousResult)。

请参阅下面给出的代码的某些部分以发送请求。

class XMLHttpRequestHandler
{
    private HttpWebRequest vWebRequestObj;
    private string vXMLString;
    private string vResponse;

    public void SendXMLHttpRequest(string pXMLString)
    {
        vWebRequestObj = (HttpWebRequest)HttpWebRequest.CreateHttp("https://test.mydomain.com/mywebservice.php");
        vWebRequestObj.Method = "PUT";
        vWebRequestObj.ContentType = "text/xml; charset=utf-8";


        // initialize the XML string
        vXMLString = pXMLString;

        // Convert the string into a byte array and calculate the length. 
        vWebRequestObj.ContentLength = Encoding.UTF8.GetBytes(vXMLString).Length;

         // start the asynchronous operation
         vWebRequestObj.BeginGetRequestStream(new AsyncCallback(GetRequestStreamCallback), vWebRequestObj);
    }

    private void GetRequestStreamCallback(IAsyncResult asynchronousResult)
    {
         // create the WebRequestObject
         HttpWebRequest vWebRequestObj = (HttpWebRequest)asynchronousResult.AsyncState;

         // End the operation and get the stream for writing the XML.
         Stream postStream = vWebRequestObj.EndGetRequestStream(asynchronousResult);

         // Convert the string into a byte array. 
         byte[] byteArray = Encoding.UTF8.GetBytes(vXMLString);

         // Write to the request stream.
         postStream.Write(byteArray, 0, byteArray.Length);
         postStream.Close();

         // Start the asynchronous operation to get the response
         vWebRequestObj.BeginGetResponse(new AsyncCallback(GetResponseCallback), vWebRequestObj);
     }

     private void GetResponseCallback(IAsyncResult asynchronousResult)
     {
         // create the WebRequestObject
         HttpWebRequest vWebRequestObj = (HttpWebRequest)asynchronousResult.AsyncState;

         // End the operation
         HttpWebResponse vWebResponseObj = (HttpWebResponse)vWebRequestObj.EndGetResponse(asynchronousResult);

         // get the response stream
         Stream ResponseStream = vWebResponseObj.GetResponseStream();

         // create the stream reader object
         StreamReader ResponseStreamReader = new StreamReader(ResponseStream);

         // read the stream
         vResponse = ResponseStreamReader.ReadToEnd();

         // output the stream
         System.Diagnostics.Debug.WriteLine(vResponse);

        // Close the stream object
        ResponseStream.Close();
        ResponseStreamReader.Close();

        // Release the HttpWebResponse
        vWebResponseObj.Close();
    }
}

我正在SendXMLHttpRequest(string pXMLString)像这样从我的项目中的其他类调用该方法

string XMLString = "<testxml><username>abcd</username><password>xyz</password></testxml>";

// send the XML HTTP request
XMLHttpRequestHandler ob = new XMLHttpRequestHandler();
string webserviceresponse = ob.SendXMLHttpRequest(XMLString);

我面临的问题是我无法弄清楚如何webserviceresponse在调用代码的变量中接收响应字符串。我该如何解决这个问题？

4

1 回答 1

1

在您的类 XMLHttpRequestHandler 中创建一个动作：

class XMLHttpRequestHandler

{
public Action<string> CallbackComplete;
}

如果已设置，则在您的方法 GetResponseCallback 中调用该操作。

if(CallbackComplete != null){CallbackComplete(vResponse);}

在您的调用者类中，您设置了一个在发生这种情况时调用的方法（您得到响应）：

private void OnObCallbackComplete(string str)
{
//Do stuff
}

ob.CallbackComplete = OnObCallbackComplete;

于 2013-08-28T11:03:09.280 回答