C# 一个多线程操作控件的例子.#######

//多线程间 控件的操作例子
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Threading;
using System.Data.SqlClient;
using System.Collections;

namespace AutoMessager
{
    delegate void myDelegate();
    delegate void SetTextCallback(string text);

    public partial class frmAutoMsg : Form
    {
        event myDelegate myEvent;
        string connStr = string.Empty;
        Thread thd;
        //private Icon eyeIcon;        

        //private NotifyIconEx notifyIconA;
        //private NotifyIconEx notifyIconB;
        private bool canClosed = false; 

        public frmAutoMsg()
        {
            this.ShowInTaskbar = false;
            InitializeComponent();
            //eyeIcon = new Icon(GetType(), "EYE.ICO");
            notifyIcon1.ContextMenu = contextMenuB; 
        }

        private void SetText(string text)
        {
            // InvokeRequired required compares the thread ID of the
            // calling thread to the thread ID of the creating thread.
            // If these threads are different, it returns true.
            if (this.txtMsgStatus.InvokeRequired)
            {
                SetTextCallback d = new SetTextCallback(SetText);
                this.Invoke(d, new object[] { text });
            }
            else
            {
                this.txtMsgStatus.Text += text;
            }
        }


        private void frmAutoMsg_Load(object sender, EventArgs e)
        {            
            connStr = System.Configuration.ConfigurationManager.AppSettings["ConnString"];
            thd = new Thread(new ThreadStart(doEvent));
            thd.IsBackground = true;
            thd.Start();
            //doEvent();            
            //notifyIcon1.Visible = true;            
        }

        /// <summary>
        /// 员工合同到期提醒
        /// </summary>
        void UpUserState()
        {
            SqlConnection conn = null;
            DateTime now = DateTime.Now;
            SqlTransaction tran = null;
            SqlDataReader dr = null;
            try
            {
               //数据库操作部分省略

                SetText(" 系统提示: 职员合同消息更新成功! ");
               SetText("执行时间:" + now.ToString("yyyy-MM-dd HH:mm:ss") + " ");

               
            }
            catch (Exception ex)
            {
                dr.Close();
                tran.Rollback();
                SetText(" 系统错误: 职员合同消息更新错误:" + ex.Message + " ");
                SetText("执行时间:" + now.ToString("yyyy-MM-dd HH:mm:ss") + " ");
            }
            finally
            {
                dr.Close();
                conn.Close();
                conn.Dispose();             
            }
        }
        /// <summary>
        /// 采购及供货 到货提醒
        /// </summary>
        void UpCaiGou()
        {
            SqlConnection conn = null;
            DateTime now = DateTime.Now;
            SqlTransaction tran = null;
            SqlDataReader dr = null;
            try
            {
                //数据库操作部分省略

                SetText("系统提示: 合同采购消息更新成功! ");
                SetText("执行时间:" + now.ToString("yyyy-MM-dd HH:mm:ss") + " ");


            }
            catch (Exception ex)
            {
                dr.Close();
                tran.Rollback();
                SetText("系统错误: 合同采购消息更新错误:" + ex.Message + " ");
                SetText("执行时间:" + now.ToString("yyyy-MM-dd HH:mm:ss") + " ");
            }
            finally
            {
                dr.Close();
                conn.Close();
                conn.Dispose();
            }           
        }

        /// <summary>
        /// 供货收款情况提醒
        /// </summary>
        void GetMoney()
        {
            SqlConnection conn = null;
            DateTime now = DateTime.Now;
            try
            {
               //数据库操作部分省略
               SetText("系统提示: 供货付款消息更新成功! ");
               SetText("执行时间:" + now.ToString("yyyy-MM-dd HH:mm:ss") + " ");
            }
            catch (Exception ex)
            {
                SetText("系统错误: 供货付款消息更新错误:" + ex.Message + " ");
                SetText("执行时间:" + now.ToString("yyyy-MM-dd HH:mm:ss") + " ");
            }
            finally
            {
                conn.Close();
                conn.Dispose();
            }
        }

        void doEvent()
        {
            //int weather = int.Parse(weatherTime.Text);
            //int del = int.Parse(fileTime.Text);
            //            if(weather < 1 || weather > 24 || del < 1 || del > 24)
            //            {
            //                MessageBox.Show("时间输入有错！");
            //                button1.Enabled = true;
            //                return ;
            //            }
            while (true)
            {

                //DateTime now = DateTime.Now;
                int i = DateTime.Now.Hour;
                if (i > 2 && i < 4)
                {
                    myEvent = new myDelegate(UpUserState);
                    myEvent += new myDelegate(UpCaiGou);
                   // myEvent += new myDelegate(GetMoney);
                }
                //if (now.Hour == 3)
                //{
                //    myEventB = new myDelegate(deltemp);
                //}
                //if (myEventA != null) myEventA();
                //if (myEventB != null) myEventB();
                if (myEvent != null)
                {
                    myEvent();
                    myEvent = null;
                }
                Application.DoEvents();
                
                Thread.Sleep(6000000); //每100分钟检查一次时间
            }
        }

        private void frmAutoMsg_FormClosing(object sender, FormClosingEventArgs e)
        {
            if (canClosed == false)
            {
                e.Cancel = true;
                this.Hide();
                this.Visible = false;
                //this.
            } 
        }

        private void menuItem2_Click(object sender, EventArgs e)
        {
            this.ShowInTaskbar = true;
            this.Show();
            this.Visible = true; //恢复主窗体
        }

        private void menuItem1_Click(object sender, EventArgs e)
        {
            canClosed = true;
            Application.Exit();
        }

        private void notifyIcon1_MouseDoubleClick(object sender, MouseEventArgs e)
        {
            this.ShowInTaskbar = true;
            this.Show();
            if (this.Visible == false)
            {
                this.Visible = true;
            }

        }

        private void btnClear_Click(object sender, EventArgs e)
        {
            this.txtMsgStatus.Text = "";
        }

        private void btnUpMsg_Click(object sender, EventArgs e)
        {
            myEvent = new myDelegate(UpUserState);
            myEvent += new myDelegate(UpCaiGou);
            //myEvent += new myDelegate(GetMoney);

            if (myEvent != null)
                myEvent();
        }          
    }
}