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(); } } }
2015年8月3日 16:49:27,更新简写版
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); }