c# - ActiveX 控件 '6bf52a52-394a-11d3-b153-00c04f79faa6' 无法实例化，因为当前线程不在单线程单元中

Question

我有一个 C# 主窗口窗体，它监听 UDP 端口以获取消息。收到所需消息后，它将启动另一个表单(视频表单)。这个视频表单由一个 axWindowsMediaPlayer1 组成，它将播放视频。

但是每当它收到启动视频表单的消息时，它就会收到一个 UDP 错误“ActiveX 控件 '6bf52a52-394a-11d3-b153-00c04f79faa6' 无法实例化，因为当前线程不在单线程单元中。”

    private void initCommunication()
    {
        CheckForIllegalCrossThreadCalls = false;
        try
        {                

            // For receiving messages
            //We are using UDP sockets
            serverSocket = new Socket(AddressFamily.InterNetwork,
                SocketType.Dgram, ProtocolType.Udp);

            //Assign the any IP of the machine and listen on port number 
            IPEndPoint ipEndPoint2 = new IPEndPoint(IPAddress.Any, listeningPort);

            //Bind this address to the server
            serverSocket.Bind(ipEndPoint2);

            IPEndPoint ipeSender = new IPEndPoint(IPAddress.Any, 0);
            //The epSender identifies the incoming clients
            EndPoint epSender = (EndPoint)ipeSender;

            //Start receiving data
            serverSocket.BeginReceiveFrom(byteData, 0, byteData.Length,
                SocketFlags.None, ref epSender, new AsyncCallback(OnReceive), epSender);

        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message, "UDP Error",
                MessageBoxButtons.OK, MessageBoxIcon.Error);
        }
    }

    #region UDP OnReceive
    private void OnReceive(IAsyncResult ar)
    {
        try
        {
            IPEndPoint ipeSender = new IPEndPoint(IPAddress.Any, 0);
            EndPoint epSender = (EndPoint)ipeSender;

            serverSocket.EndReceiveFrom(ar, ref epSender);

            //Transform the array of bytes received from the user into an
            //intelligent form of object Data
            Data msgReceived = new Data(byteData);

            switch (msgReceived.strMessage)
            {
                case "1":
                    btnPlayVideo_Click(null,null);
                    break;                    
            }               

            txtLog.Text += msgReceived.strName + " : " + msgReceived.strMessage + "\r\n";
            txtLog.SelectionStart = txtLog.Text.Length;
            txtLog.ScrollToCaret();
            serverSocket.BeginReceiveFrom(byteData, 0, byteData.Length, SocketFlags.None, ref epSender,
                    new AsyncCallback(OnReceive), epSender);

        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message, "UDP OnReceive Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
        }
    }
    #endregion

错误在这一行中抛出
axWindowsMediaPlayer1 = new AxWMPLib.AxWindowsMediaPlayer();

我在网上搜索过，如何创建 STA？

Answer 1

添加 [STAThread]归因于您的 Main方法。