C# 委托delegate 例子

        private delegate void ShowStatusMessage(string vinfo);//代理
        private void SetLabelMesssage(string vinfo)
        {
            //判断是否有其它线程调用控件
            if (this.InvokeRequired)
            {
                ShowStatusMessage setpos = new ShowStatusMessage(SetLabelMesssage);
                this.Invoke(setpos, new object[] { vinfo });
            }
            else
            {
                lblExpress.Text = vinfo;
                if (NowCount == ExpressCount)
                {
                    lblExpress.Text = "";
                    DevExpress.XtraEditors.XtraMessageBox.Show(string.Format("预约结束! 成功数{0}笔，失败数{1}!", sCount, dCount), AppMessage.MSG0000);
                    GetDataSale();
                }
            }
        }