一个WinForm中的异步例子

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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;   namespace VS11 {     public partial class FrmLogin : Form     {         public delegate void Action();         public FrmLogin()         {             InitializeComponent();         }           private void btnLogin_Click(object sender, EventArgs e)         {             Action action = new Action(this.Login);             action.BeginInvoke(null, null);         }           private void btnExit_Click(object sender, EventArgs e)         {             this.Close();         }         private void Login()         {             this.btnLogin.Invoke(new Action(() => { this.btnLogin.Enabled = false; }));             this.txtUserName.Invoke(new Action(() => { this.txtUserName.Enabled = false; }));             this.txtPassWord.Invoke(new Action(() => { this.txtPassWord.Enabled = false; }));             this.libMessage.Invoke(new Action(() => { this.libMessage.Text = "正在链接数据库..."; }));             Thread.Sleep(1000);             this.libMessage.Invoke(new Action(() => { this.libMessage.Text = "正在查询用户表..."; }));             Thread.Sleep(1000);             this.libMessage.Invoke(new Action(() => { this.libMessage.Text = "正在验证用户名..."; }));             Thread.Sleep(1000);             this.libMessage.Invoke(new Action(() => { this.libMessage.Text = "正在验证密码..."; }));             Thread.Sleep(1000);             this.libMessage.Invoke(new Action(() => { this.libMessage.Text = "用户登录成功..."; }));             this.btnLogin.Invoke(new Action(() => { this.btnLogin.Enabled = true; }));             this.txtUserName.Invoke(new Action(() => { this.txtUserName.Enabled = true; }));             this.txtPassWord.Invoke(new Action(() => { this.txtPassWord.Enabled = true; }));         }     } }