從非建立控制項的線程訪問控制項

類testThread

 

using System;
using System.Collections.Generic;
using System.Text;
namespace testThread
{
    public class MessageSendEventArgs : EventArgs
    {
        public String Message;
        public MessageSendEventArgs(string message)
        {
            this.Message = message;
        }
    }
    class SubThread
    {
        public delegate void MessageSendEventHandler(object sender, MessageSendEventArgs e);
        //定義事件
        public event MessageSendEventHandler MessageSend;
        protected virtual void OnMessageSend(MessageSendEventArgs e)
        {
            if (MessageSend != null)
                MessageSend(this, e);
        }
        //定義一個線程
        public System.Threading.Thread sendthread;
        public void Sendding()
        {
            while(true)
            {
                System.Threading.Thread.Sleep(500);
                this.OnMessageSend(new MessageSendEventArgs(DateTime.Now.ToString()));
            }
        }
        //開始線程函數
        public void StartSend()
        {
            sendthread = new System.Threading.Thread(new System.Threading.ThreadStart(Sendding));
            sendthread.Start();
        }
        //結束線程函數
        public void EndSend()
        {
            sendthread.Abort();
        }
    }
}

 

那麼在主表單內，使用 Control.CheckForIllegalCrossThreadCalls = false;

可以回到.net1.1預設可以從非主線程修改控制項。也可以使用invoke方法。

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace testThread
{
    public partial class Form1 : Form
    {

        public delegate void MessageHandler(MessageSendEventArgs e);
        SubThread _subthread;                                                      //定義一個線程

        public Form1()
        {
            InitializeComponent();
           // Control.CheckForIllegalCrossThreadCalls = false;
            this._subthread = new SubThread();                                     //建立線程執行個體
            this._subthread.MessageSend += this._subthread_MessageSend;
            //this._subthread.MessageSend += this._subthread_MessageSend;            //訂閱事件
        }
        public void MessageAdd(MessageSendEventArgs e)
        {
            listBox1.Items.Add(e.Message);
        }

        private  void _subthread_MessageSend(object sender, MessageSendEventArgs e)
        {
             //執行個體化代理
              MessageHandler handler = new MessageHandler(MessageAdd);
             ////調用Invoke
            this.Invoke(handler, new object[] { e });
             //listBox1.Items.Add(e.Message);
        }

        private void button1_Click(object sender, EventArgs e)
        {
            this._subthread.StartSend();
            this.listBox1.Items.Add("開始....");
        }

        private void button2_Click(object sender, EventArgs e)
        {
            this._subthread.EndSend();
            this.listBox1.Items.Add("停止");
        }

    }
}