c# Thread 不会将 Row 添加到 DataGridView CrossThreadError

Question

我正在学习 c#，我想知道为什么我的代码不会在 ReceivePacket 区域向我的 DataGridView 添加一行。它在 SendPacket 中有效，但在另一个中无效。目的是简单地将 UDP 数据包发送到机器，在此先感谢。这是我的代码:

private void btnSend_Click(object sender, EventArgs e)
        {
            SendPacket();
        }
        private void btnReceiving_Click(object sender, EventArgs e)
        {
            Thread thread = new Thread(new ThreadStart(reciev));
            thread.Start();
        }    

UdpClient client = new UdpClient();

        public void SendPacket()
        {
            byte[] packet = Encoding.ASCII.GetBytes(DateTime.Now.ToString("HH:mm:ss:ff"));
            client.Send(packet, packet.Length, tbIP.Text, 444);
            dgvSend.Rows.Add(DateTime.Now.ToString("HH:mm:ss:ff"));
        }

        public void ReceivePacket(byte[] packet)
        {// it goes wrong here, because it gives a crossthread error
            dgvReceiv.Rows.Add(Encoding.ASCII.GetString(packet), DateTime.Now.ToString("HH:mm:ss:ff"));
        }

        public void reciev()
        {
            UdpClient client = new UdpClient(444);
            while (true)
            {
                IPEndPoint server = new IPEndPoint(IPAddress.Any, 0);
                byte[] packet = client.Receive(ref server);
                ReceivePacket(packet);
            }
        }

我使用这行代码而不是正常的(通过调用 :) )修复了它:

dgvReceiv.Invoke(new MethodInvoker(delegate { dgvReceiv.Rows.Add(Encoding.ASCII.GetString(packet), DateTime.Now.ToString("HH:mm:ss:ff")); }));

Answer 1

这里是使用委托(delegate)从其他线程调用在主线程上创建的控件上的操作的示例。

http://msdn.microsoft.com/en-us/library/zyzhdc6b.aspx