c# - 跨线程操作无效

Question

我调试的时候一直报如下错误。

Cross-thread operation not valid: Control 'richTextBoxReceivedMsg' accessed from a thread other than the thread it was created on.

这是它指向的代码:

public void OnDataReceived(IAsyncResult asyn)
{
    try
{
    SocketPacket socketData = (SocketPacket)asyn.AsyncState;

    int iRx  = 0;

        // Complete the BeginReceive() asynchronous call by EndReceive() method
        // which will return the number of characters written to the stream by the client
        iRx = socketData.m_currentSocket.EndReceive (asyn);

        char[] chars = new char[iRx +  1];
        System.Text.Decoder d = System.Text.Encoding.UTF8.GetDecoder();
        int charLen = d.GetChars(socketData.dataBuffer, 0, iRx, chars, 0);
        System.String szData = new System.String(chars);
        richTextBoxReceivedMsg.AppendText(szData);

        // Continue the waiting for data on the Socket
        WaitForData( socketData.m_currentSocket);
    }
    catch (ObjectDisposedException)
    {
        System.Diagnostics.Debugger.Log(0,"1","\nOnDataReceived: Socket has been closed\n");
    }
    catch (SocketException se)
    {
        MessageBox.Show(se.Message);
    }
}

有人可以帮我解决这个问题吗？

Answer 1

你需要替换这个:

richTextBoxReceivedMsg.AppendText(szData);

用类似的东西

Invoke(new Action(() => richTextBoxReceivedMsg.AppendText(szData)));

原因是 Windows 窗体并非真正设计用于跨不同线程工作。 Invoke 方法将运行您在 UI 线程中传递给它的委托(delegate)。如果您想通过其他线程操作 UI 元素，则必须在 UI 线程上运行实际操作。 InvokeRequired 属性会告诉您何时需要使用 Invoke 而不是直接调用该方法。