异步总结

 

异步委托调用方法示例

ThreadPool.QueueUserWorkItem((obj) => {
if (InvokeRequired && IsHandleCreated) {
this.BeginInvoke(new Action<object>(delegate(object arg) {
// Threads();
setText();
}), new object[] { null });
}

});

public void setText() {
this.textBox1.Text = "45";

}

 

   ExecEventHandler((obj, args) =>
                            {
                                ExecProcDomainJX(Month, falg);
                            }, 500);


   private void ExecProcDomainJX(string Month, int flag)
        {
            string StrSql_1 = "EXEC PLMS_AInsertTB_DomainJX N'" + SessionAuth.UserName + "',N'" + Month + "'," + flag + "";
            MyStyleControl.Win.MyWinSrv.ExecuteNonQuery(StrSql_1, new object[] { });
        }

 时间倒计时功能 以前有用过Timer定时器来执行,每隔一秒执行,个人认为这样会增加程序开销,最近做公司的考试模块答题时需要显示倒计时,网上搜索了下,觉得下面这个方法比较好,如下:

   ThreadPool.QueueUserWorkItem((arg) =>
            {
                TimeSpan TS = endDate - WinSrv.ServerDateTime;
                while (true)
                {
                    Thread.Sleep(1000);
                    if (TS.TotalSeconds >= 0)
                    {
                        if (!this.IsHandleCreated) return;

                        this.BeginInvoke((EventHandler)delegate
                        {
                            lblTime.Text = quesMsg + string.Format("; 剩余{0}天{1}时{2}分{3}秒", TS.Days, TS.Hours, TS.Minutes, TS.Seconds);
                            this.panel.focus();//当前panel重新获取焦点 要不然每次倒计时的时候 界面会回滚到最前面
                        });
                    }
                    if (TS.TotalSeconds == 0) //考试时间到 自动提交
                    {
                        this.Invoke((EventHandler)delegate
                      {
                          this.btn_Submit_Click(null, null);
                      });
                    }
                    TS = AddSeconds(TS, -1);
                    
                }
            });

private static TimeSpan AddSeconds(TimeSpan ts, int seconds)
{
return ts.Add(new TimeSpan(0, 0, seconds));
}

时间倒计时