从另一个类修改 TextBox 时遇到问题

Question

我遇到了一个问题，我希望能够修改另一个类的文本框。

我尝试过搜索和测试解决方案，但似乎没有一个能胜任。 （调用一个例子..）

cThread 类的代码：

        class cThread
        {

            public bool closed = false;
            private TcpClient client;
            private StreamReader ins;
            private StreamWriter ots;
            Form1 meow = new Form1();

            public cThread(TcpClient client, StreamReader ins, StreamWriter ots)
            {
                this.client = client;
                this.ins = ins;
                this.ots = ots;
            }

            public void run()
            {
                try
                {
                    string responseLine;

                    responseLine = meow.bunifuCustomTextbox2.Text;

                    while ((responseLine = ins.ReadLine()) != null)
                    {

                        Console.WriteLine(responseLine);

                        meow.bunifuCustomTextbox3.Text = responseLine + " test";

                        if (responseLine.IndexOf("*** Adios") != -1)
                        {
                            break;
                        }
                    }
                    closed = true;
                }
                catch (Exception e)
                {
                    MessageBox.Show(e.ToString());
                }
                Environment.Exit(0);
            }
        }

这会导致错误：Cross-Thread operation not valid: accessed from a thread other than the thread it was created on.

我也试过这个解决方案：

            public void run()
            {
                try
                {
                    string responseLine;

                    meow.bunifuCustomTextbox2.Invoke(new MethodInvoker(delegate { responseLine = meow.bunifuCustomTextbox2.Text; }));

                    while ((responseLine = ins.ReadLine()) != null)
                    {

                        Console.WriteLine(responseLine);

                        meow.bunifuCustomTextbox3.Invoke(new MethodInvoker(delegate { meow.bunifuCustomTextbox3.Text = meow.bunifuCustomTextbox2.Text; }));

                        meow.bunifuCustomTextbox3.Text = responseLine + " test";

                        if (responseLine.IndexOf("*** Adios") != -1)
                        {
                            break;
                        }
                    }
                    closed = true;
                }
                catch (Exception e)
                {
                    MessageBox.Show(e.ToString());
                }
                Environment.Exit(0);
            }
        }

这也不起作用。同样的错误。

我期望发生的是，当用户在 bunifuCustomTextbox2 中输入消息时，它将被设置为我希望由 bunifuCustomTextbox3 更新的 responseLine。

因为这将是一个多人聊天，我正在将此代码从控制台应用程序转换为 winforms..

对不起，我是个笨蛋:(

Answer 1

当您从另一个线程访问 UI 资源时，您应该拥有 Dispatcher 线程句柄：

Dispatcher.Invoke(() => { /* UI changes */ });