调用不起作用? [英] Invoking not working?

问题描述

想知道，如果方法不起作用，那么调用方法有什么意义呢?在过去的7个小时中，我一直努力使其正常运行，但是没有运气.我没有收到错误，只是根本行不通.这是我的代码.

Just wondering, what is the point in invoking a method if it does not work? I have spent the past 7 hours trying to get it to work but had no luck. I dont get an error, it just simply does not work. here is my code.

delegate void StringParameterDelegate(string value);

void UpdateStatus(string value)
        {
            if (InvokeRequired)
            {
                // We're not in the UI thread, so we need to call BeginInvoke
                BeginInvoke(new StringParameterDelegate(UpdateStatus), new object[] { value });
                return;
            }
            // Must be on the UI thread if we've got this far
            rtbChat.Text = value;

        }

void OnReceive(IAsyncResult ar)
 {
     String content = String.Empty;
     StateObject state = (StateObject)ar.AsyncState;
     Socket handler = state.workSocket;
     int bytesRead;
     if (handler.Connected)
     {
         // Read data from the client socket.
         try
         {
             bytesRead = handler.EndReceive(ar);
             if (bytesRead > 0)
             {
             state.sb.Remove(0, state.sb.Length);
                 state.sb.Append(Encoding.ASCII.GetString(state.buffer, 0, bytesRead));
                 // Display Text in Rich Text Box
                 content = state.sb.ToString();
                 UpdateStatus(content);
                 handler.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0, new AsyncCallback(OnReceive), state);
             }
         }

         catch (SocketException socketException)
         {
             if (socketException.ErrorCode == 10054 || ((socketException.ErrorCode != 10004) && (socketException.ErrorCode != 10053)))
             {
                 handler.Close();
             }
         }
     }
 }

我开始相信这是不可能的.无论我如何设置调用，它都不会更新我的richTextBox，如果我设置为将messageBoz.Show设置为更新状态，则它可以工作，但它永远不会更新richTextBox(rtbChat).

任何帮助将不胜感激.
在此先谢谢您.

I am beginning to believe that it is not possible. No matter how I set up the invoke it simply does not update my richTextBox, if I set put a messageBoz.Show in the update status it works, but it never updates the richTextBox(rtbChat).

Any help would be greatly appriciated.
Thanks in advance.

推荐答案

请尝试以下操作操作您的UpdateStatus函数；

Try the following for your UpdateStatus function;

private void UpdateStatus(string text)
{
   if (rtbChat.InvokeRequired)
   {
      StringParameterDelegate d = new StringParameterDelegate(UpdateStatus);
      this.Invoke(d, new object[] { text });
   }
   else
   {
      rtbChat.Text = text;
   }
}

或者不需要自定义委托:

Or without the need for a custom delegate:

void UpdateText(string value)
{
    if (InvokeRequired)
        Invoke(new MethodInvoker(delegate { UpdateText(value); }));
    else
        rtbChat.Text = value;
}

[添加]发表了有关此的提示，已引起一些替代方法和一些有趣的讨论

[Added] Posted a Tip about this which has attracted some alternative methods and some interesting discussion here[^].

这篇关于调用不起作用?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！