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;
using System.Threading;namespace LoginIn
{public partial class Form1 : Form{delegate void MyDelegate(string name, string code);delegate void SetTipDelegate(string tip);public Form1(){InitializeComponent();}private void button1_Click(object sender, EventArgs e){string name = txtName.Text;string code = txtCode.Text;//调用委托，用新线程校验用户名、密码MyDelegate myDelegate = new MyDelegate(CheckUser);myDelegate.BeginInvoke(name, code, null, null);}void CheckUser(string name, string code){Thread.Sleep(2000);if (name == "1" && code == "1"){SetTip("成功");}else{SetTip("失败");}}void SetTip(string tip){//是否调用Invoke方法if (lbTip.InvokeRequired)//if(!从创建控件“lbTip”的线程访问它){//调用委托SetTipDelegate myDelegate = new SetTipDelegate(SetTip);Invoke(myDelegate, tip);}else{lbTip.Text = tip;}}private void timer1_Tick(object sender, EventArgs e){button1.Text = DateTime.Now.ToString();}}
}

protected void button1_Click(object sender,EventArgs e){string userName = txtName.Text;string userCode = txtCode.Text;Func<string ,string ,string> d1 = (name, code) =>           (name == "1" && code == "1") ? "成功" : "失败";                            d1.BeginInvoke(userName,userCode,ar=>{string result= d1.EndInvoke(ar);Action<string> action1=data=>label1.Text=data;Invoke(action1,result);},null);}