網絡編程-關於BeginGetResponse的問題

關於BeginGetResponse的問題

public class A{
public void SetJsonSource(string _Uri)
{
WebRequest req = WebRequest.Create(_Uri);
req.Method = "GET";
req.BeginGetResponse(ResponseCallback, req);

    }
            private void ResponseCallback(IAsyncResult result)
    {
        string JsonSource = "";
        HttpWebRequest httpwenReq = (HttpWebRequest)result.AsyncState;
        WebResponse webResponse = httpwenReq.EndGetResponse(result);
        using (Stream stream = webResponse.GetResponseStream())
        using (StreamReader reader = new StreamReader(stream))
        {
            JsonSource = reader.ReadToEnd();
        }  

    }

}
public class B{
void GetSource(){
A a =new A();
a.SetJsonSource("****");
}
}
問題是怎麼樣得到ResponseCallback裡面的JsonSource?

最佳回答：

定義一個委托或函數，然後在ResponseCallback調用就可以了