我是 C# 的新手，我正在尝试制作一个简单的客户端服务器聊天应用程序。

我的客户端窗口窗体上有 RichTextBox，我正在尝试从另一个类中的服务器更新该控件。当我尝试执行此操作时，出现错误:“跨线程操作无效:从创建它的线程以外的线程访问控制 textBox1”。

这是我的 Windows 窗体的代码:

private Topic topic;  
public RichTextBox textbox1;  
bool check = topic.addUser(textBoxNickname.Text, ref textbox1, ref listitems);

主题类:

public class Topic : MarshalByRefObject  
{  
    //Some code
 public  bool addUser(string user, ref RichTextBox textBox1, ref List<string> listBox1)  
 {  
     //here i am trying to update that control and where i get that exception  
     textBox1.Text += "Connected to server... \n";  
}

那怎么办呢？如何从另一个线程更新文本框控件？

我正在尝试使用 .net 远程处理制作一些基本的聊天客户端/服务器应用程序。 我想将 Windows 窗体客户端应用程序和控制台服务器应用程序作为单独的 .exe 文件。我在这里尝试从客户端调用服务器函数 AddUser，我想 AddUser 函数更新我的 GUI。我已经按照 Jon 的建议修改了代码，但现在我得到了这个异常而不是跨线程异常......“SerializationException:程序集中的类型主题未标记为可序列化”。

我将在下面发布我的全部代码，将尽量保持简单。
欢迎任何建议。非常感谢。

服务器:

  namespace Test
{
    [Serializable]
    public class Topic : MarshalByRefObject
    {
        public bool AddUser(string user, RichTextBox textBox1, List<string> listBox1)
        {
            //Send to message only to the client connected
            MethodInvoker action = delegate { textBox1.Text += "Connected to server... \n"; };
            textBox1.BeginInvoke(action);
            //...
            return true;
        }

        public class TheServer
        {
            public static void Main()
            {

                int listeningChannel = 1099;

                BinaryServerFormatterSinkProvider srvFormatter = new BinaryServerFormatterSinkProvider();
                srvFormatter.TypeFilterLevel = TypeFilterLevel.Full;

                BinaryClientFormatterSinkProvider clntFormatter = new BinaryClientFormatterSinkProvider();

                IDictionary props = new Hashtable();
                props["port"] = listeningChannel;

                HttpChannel channel = new HttpChannel(props, clntFormatter, srvFormatter);
                // Register the channel with the runtime            
                ChannelServices.RegisterChannel(channel, false);
                // Expose the Calculator Object from this Server
                RemotingConfiguration.RegisterWellKnownServiceType(typeof(Topic),
                                                    "Topic.soap",
                                                    WellKnownObjectMode.Singleton);
                // Keep the Server running until the user presses enter
                Console.WriteLine("The Topic Server is up and running on port {0}", listeningChannel);
                Console.WriteLine("Press enter to stop the server...");
                Console.ReadLine();
            }
        }
    }

}  

Windows 窗体客户端:

// Create and register a channel to communicate to the server
        // The Client will use the port passed in as args to listen for callbacks

        BinaryServerFormatterSinkProvider srvFormatter = new BinaryServerFormatterSinkProvider();
        srvFormatter.TypeFilterLevel = TypeFilterLevel.Full;
        BinaryClientFormatterSinkProvider clntFormatter = new BinaryClientFormatterSinkProvider();
        IDictionary props = new Hashtable();
        props["port"] = 0;

        channel = new HttpChannel(props, clntFormatter, srvFormatter);
        //channel = new HttpChannel(listeningChannel);

        ChannelServices.RegisterChannel(channel, false);
        // Create an instance on the remote server and call a method remotely
        topic = (Topic)Activator.GetObject(typeof(Topic), // type to create
        "http://localhost:1099/Topic.soap" // URI
        );


        private Topic topic;
        public RichTextBox textbox1;
        bool check = topic.addUser(textBoxNickname.Text,textBox1, listitems);