难题, 跨线程窗口调用!

Question

在给客户做的一个程序中附带一个聊天程序, 若先在主窗口创建聊天窗口, 一切正常, 但消息触发创建的窗口, 主程序在调用时, 出现跨线程控件调用错误, 怎么处理, 谢谢拉!!!!!

Answer 1

// 源代码1.ClientMessageManagerusing System;
using System.ComponentModel;
namespace ESAPP.Net
{
    public delegate void EmptyMethod();    public class ClientMessageManager
    {
        IAppServer server;
        AppEventRepeater repeater;
        ChatRoom chatRoom;        public ClientMessageManager(IAppServer server, AppEventRepeater repeater)
        {
            this.server = server;
            this.repeater = repeater;
            
            repeater.MessageReceived += new MessageEventHandler(repeater_MessageReceived);           
        }        void worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            ChatRoom room = CreateChatRoom();
            room.Show();
            room.WindowState = System.Windows.Forms.FormWindowState.Normal;
            room.BringToFront();
        }        
        public ChatRoom CreateChatRoom()
        {          
            if (chatRoom == null)
            {
                chatRoom = new ChatRoom(repeater.UserID, repeater.UserName, server);
                chatRoom.Disposed += new EventHandler(chatRoom_Disposed);
            }
            return chatRoom; 
        }        void chatRoom_Disposed(object sender, EventArgs e)
        {
            this.chatRoom = null;
            server.RemoveRepeater(this.repeater);
        }
        public void ShowChatRoom()
        {
            ChatRoom room = CreateChatRoom();            if (room.InvokeRequired)
            {
                EmptyMethod m = new EmptyMethod(room.Show);
                //room.Invoke(m);  用此方法调用, 程序没有响应
                m.Invoke();  // 用此方法调用, 出现跨线程调用控件错误
                               EmptyMethod m2 = new EmptyMethod(room.BringToFront);
                ////room.Invoke(m2); 
                room.Invoke(m2);
            }
            else
            {
                room.Show();
                room.WindowState = System.Windows.Forms.FormWindowState.Normal;
                room.BringToFront();
            }            
        }
        #region 接收/处理消息
        void repeater_MessageReceived(object sender, MessageEventArgs e)
        {
            if (e.Message.Type == MessageType.Chat)
            {
                SendMsgToChatRoom(e);
            }
        }              void SendMsgToChatRoom( MessageEventArgs e)
        {
            if (chatRoom == null)
            {
                this.CreateChatRoom();
                chatRoom.Show();                chatRoom.WindowState = System.Windows.Forms.FormWindowState.Minimized;
            }            MessageEventHandler handler = new MessageEventHandler(chatRoom.OnMessageReceived);
            handler.Invoke(null, e);
        }        #endregion
    }
}

Answer 2

源代码2.  ChatRoom, 没有问题using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;namespace ESAPP.Net
{
    public partial class ChatRoom : Form
    {
        private Icon m_Icon1;
        private Icon m_Icon2;
        private bool m_bFlag;    
        private IAppServer server;
      
        string userID;       
        string userName;        delegate void SetTextCallback(string text);
                
        public ChatRoom(string userID, string userName, IAppServer server)
        {            InitializeComponent();            this.userID = userID;
            this.userName = userName;            this.listBox1.Items.Add("所有人");            this.server = server;
            try
            {
                server.UserAdded += new AppUserEventHanlder(server_UserAdded);
                server.UserRemoved += new AppUserEventHanlder(server_UserRemoved);
                server.UserInterrupted += new AppUserEventHanlder(server_UserInterrupted);
            }
            catch (Exception ex)
            {
                System.Diagnostics.Debug.Fail(ex.ToString());
            }            ErrorList errors = new ErrorList();            SimpleUserInfoList infos =  server.GetSimpleUserInfos(errors);
            if (errors.Count == 0)
            {
                foreach (SimpleUserInfo info in infos)
                {
                    if (info.UserID != userID)
                    {
                        this.listBox1.Items.Add(info);
                    }
                }
            }
            else
            {
                MessageBox.Show("错误: "  + errors.ToString(), "获取用户列表", MessageBoxButtons.OK, MessageBoxIcon.Warning);
            }
           
            m_bFlag = true;            //导入图标文件
            try
            {
                m_Icon1 = new Icon("Icon1.ico");
                m_Icon2 = new Icon("Icon2.ico");
            }
            catch (Exception e)
            {
                MessageBox.Show("错误: " + e.Message, "即时通信");
            }
        }              
        void server_UserInterrupted(object sender, AppUserEventArgs e)
        {
            if (e.UserID != userID)
            {
                this.SetUserRemoved(e.UserID);
            }
            
        }        void server_UserRemoved(object sender, AppUserEventArgs e)
        {
            if (e.UserID != userID)
            {
                this.SetUserRemoved(e.UserID);
            }
        }        void server_UserAdded(object sender, AppUserEventArgs e)
        {
            if (e.UserID != userID)
            {
                this.SetUserAdded(e.UserID);
            }
        }
        public void OnMessageReceived(object sender, MessageEventArgs e)
        {
            if (e.Message.Type != MessageType.Chat)
            {
                return;
            }            if (this.isShown == false)
            {
                this.WindowState = System.Windows.Forms.FormWindowState.Minimized;
                this.Show();
            }            if (this.WindowState == FormWindowState.Minimized)
            {                
                try
                {
                    timer1.Start();
                }
                catch (Exception ex)
                {
                    System.Diagnostics.Debug.Fail(ex.ToString());
                }
            }
            this.SetText(string.Format("{0} 对你说: {1}" , e.Message.SenderName , e.Message.Message));        }
        private void SetText(string text)
        {
            if (this.txtMessage.InvokeRequired)
            {
                SetTextCallback d = new SetTextCallback(SetText);
                this.Invoke(d, new object[] { text });
            }
            else
            {
                this.txtMessage.Text += text + Environment.NewLine;
            }
        }
        private void SetUserAdded(string userID)
        {
            if (this.listBox1.InvokeRequired)
            {
                SetTextCallback d = new SetTextCallback(SetUserAdded);
                this.Invoke(d, new object[] { userID });
            }
            else
            {
                this.listBox1.OnUserAdded(userID);
            }
        }        private void SetUserRemoved(string userID)
        {
            if (this.listBox1.InvokeRequired)
            {
                SetTextCallback d = new SetTextCallback(SetUserRemoved);
                this.Invoke(d, new object[] { userID });
            }
            else
            {
                this.listBox1.OnUserRemoved(userID);
            }
        }
        bool isShown = false;
        protected override void OnShown(EventArgs e)
        {
            isShown = true;
            base.OnShown(e);
        }        private void ChatRoom_Resize(object sender, EventArgs e)
        {
            if (this.WindowState == FormWindowState.Minimized)
            {
                this.Hide();
                this.notifyIcon1.Icon = m_Icon1;
                m_bFlag = true;
            }
            else
            {
                this.timer1.Stop();
                this.notifyIcon1.Icon = m_Icon1;
                m_bFlag = true;
            }
        }        private void notifyIcon1_MouseDoubleClick(object sender, MouseEventArgs e)
        {
            if (this.Visible)
            {
                return;
            }            timer1.Stop();
            notifyIcon1.Icon = m_Icon1;
            m_bFlag = true;            this.Visible = true;
            this.WindowState = FormWindowState.Normal;
        }        private void timer1_Tick(object sender, EventArgs e)
        {
            if (m_Icon1 != null && m_Icon2 != null) //如果两个图标文件都被正确载入
            {
                if (m_bFlag == true)
                {
                    this.notifyIcon1.Icon = m_Icon2;
                    m_bFlag = false;
                }
                else
                {
                    this.notifyIcon1.Icon = m_Icon1;
                    m_bFlag = true;
                }
            }
        }        private void btnSend_Click(object sender, EventArgs e)
        {
            string msg = txtNewMsg.Text.Trim();            if (msg == "")
            {
                return;
            }            string receiverID = null;
            if (listBox1.SelectedIndex > 0)
            {
                receiverID = (this.listBox1.SelectedItem as SimpleUserInfo).UserID;
            }            AppMessage m = new AppMessage();
            m.Message = msg;
            m.SenderID = userID;
            m.SenderName = userName;
            m.ReceiverID = receiverID;            server.MsgService.SendMessage(m);
            
        }        private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            int index = listBox1.SelectedIndex;            string name = (index == 0) ? "所有人" : (this.listBox1.SelectedItem as SimpleUserInfo).UserName;
            this.txtReceiver.Text = name;
        }
       
    }
}

Answer 3

错误出现在: 
public void ShowChatRoom()
        {
            ChatRoom room = CreateChatRoom();            if (room.InvokeRequired)
            {
                EmptyMethod m = new EmptyMethod(room.Show);
                //room.Invoke(m);  用此方法调用, 程序没有响应
                m.Invoke();  // 用此方法调用, 出现跨线程调用控件错误
                               EmptyMethod m2 = new EmptyMethod(room.BringToFront);
                ////room.Invoke(m2); 
                room.Invoke(m2);
            }
            else
            {
                room.Show();
                room.WindowState = System.Windows.Forms.FormWindowState.Normal;
                room.BringToFront();
            }            
        }怎么解决， 谢谢，谢谢， 再谢谢！！！！

Answer 4

错误出现在: 
public void ShowChatRoom()
        {
            ChatRoom room = CreateChatRoom();            if (room.InvokeRequired)
            {
                EmptyMethod m = new EmptyMethod(room.Show);
                //room.Invoke(m);  用此方法调用, 程序没有响应
                m.Invoke();  // 用此方法调用, 出现跨线程调用控件错误
                               EmptyMethod m2 = new EmptyMethod(room.BringToFront);
                ////room.Invoke(m2); 
                room.Invoke(m2);
            }
            else
            {
                room.Show();
                room.WindowState = System.Windows.Forms.FormWindowState.Normal;
                room.BringToFront();
            }            
        }怎么解决， 谢谢，谢谢， 再谢谢！！！！
尝试修改为：public void ShowChatRoom()
        {
            ChatRoom room = CreateChatRoom();            if (room.InvokeRequired)
            {
                EmptyMethod m = new EmptyMethod(room.Show);
                //room.Invoke(m);  用此方法调用, 程序没有响应
                this.Invoke();  // 用此方法调用, 出现跨线程调用控件错误
                               EmptyMethod m2 = new EmptyMethod(room.BringToFront);
                ////room.Invoke(m2); 
                this.Invoke(m2);
            }
            else
            {
                room.Show();
                room.WindowState = System.Windows.Forms.FormWindowState.Normal;
                room.BringToFront();
            }            
        }

Answer 5

尝试修改为：public void ShowChatRoom()
        {
            ChatRoom room = CreateChatRoom();            if (room.InvokeRequired)
            {
                EmptyMethod m = new EmptyMethod(room.Show);
                //room.Invoke(m);  用此方法调用, 程序没有响应
                this.Invoke(m);  // 用此方法调用, 出现跨线程调用控件错误
                               EmptyMethod m2 = new EmptyMethod(room.BringToFront);
                ////room.Invoke(m2); 
                this.Invoke(m2);
            }
            else
            {
                room.Show();
                room.WindowState = System.Windows.Forms.FormWindowState.Normal;
                room.BringToFront();
            }            
        }

Answer 6

wuyazhe(接单：wince应用软件/上位机(串口,usb)软件) 
由于: ShowChatRoom方法在类ClientMessageManager, 这个类负责接受消息并处理的, 不是一个Windows控件, 不能调用this.Invoke()我试试将从Control中继承, 调用this.Invoke(m)

Answer 7

只要你找到任意一个在主线程中创建的Control就可以用它的Invoke(m);如果找不到,人为生成一个也行,把它设置成Public Static,无论在哪里都能访问到,但关键一定要在主线程上生成它的实例.

Answer 8

你这里边还有一个问题:生成ChatRoom也需要在主线程上,也就是说 CreateChatRoom()也要在主线程上运行,这样改:public void ShowChatRoom()
{//myControl: 是一个主线程上生成的Control
/在这里实际上不用判断 if (room.InvokeRequired)
myControl.Invoke(new EmptyMethod(CreateChatRoom));}
//把Show(); 和 BringToFront(); 也加到这里边去.
public ChatRoom CreateChatRoom()
 {          
            if (chatRoom == null)
            {
                chatRoom = new ChatRoom(repeater.UserID, repeater.UserName, server);
                chatRoom.Disposed += new EventHandler(chatRoom_Disposed);
               chatRoom.Show(); 
                chatRoom.BringToFront();
            }
            return chatRoom; 
}

Answer 9

那就不要用show了。就这样
ChatRoom room = CreateChatRoom();
room.Show();
Application.Run(room);

Answer 10

if (this.InvokeRequired)
            {
                 EmptyMethod m = new EmptyMethod(room.Show);
                delegate void MessageReceiveHandler();
                MessageReceiveHandler handler = new MessageReceiveHandler(m);
                Invoke(handler, sender, e);
            }

Answer 11

把需要的资源作成全局的 就可以了或者用REF把对象传进去啊
这么简单的问题