WinForm零散的记录<2>

1.datetimepicker 比较前后 （valuechange是不行的,会出现弹出循环)

        
private void dtpStartDate_CloseUp(object sender, EventArgs e)
        {
            myCommBll.CheckStartAndEndDate(dtpStartDate, dtpEndDate);
        }

 public void CheckStartAndEndDate(DateTimePicker dtpStartDate, DateTimePicker dtpEndDate)
{
            dtpStartDate.MinDate = DateTime.Parse(DateTime.Now.AddYears(-1).ToShortDateString());
            dtpEndDate.MaxDate = DateTime.Parse(DateTime.Now.ToShortDateString());

            DateTime StartDate = dtpStartDate.Value.Date, EndDate = dtpEndDate.Value.Date;
            TimeSpan dateDif = EndDate.Subtract(StartDate);

            int dateDay = dateDif.Days;
                try
                {
                    if (dateDay<0)
                    {
                        MessageBox.Show("起始日期必须小于等于终止日期", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
                        dtpStartDate.Value = EndDate;
                        return;
                    }
                  
                }
                catch
                {
                    return;
                }
}