从日期到日期使用c＃Datetimepicker验证进行验证

问题描述：

private void dateTimePickerHolidayToDate_ValueChanged(object sender, EventArgs e)
        {
DateTime fromdate = Convert.ToDateTime(dateTimePickerFromDate.Text);
DateTime todate1 = Convert.ToDateTime(dateTimePickerToDate.Text);               
                if (fromdate1 <= todate1)
                {
                    TimeSpan daycount = todate1.Subtract(fromdate1);
                    int dacount1 = Convert.ToInt32(daycount.Days) + 1;
                    txtDay.Text = Convert.ToString(dacount1);                    
                }
                else
                {                    
                   MessageBox.Show("From Date Must be Less Than To Date");
                }
        }

HI祝每个人下午好，在Windows应用程序我使用两个datetimepicker从日期和到日期...选择到日期后，我需要计算从日期和到日期天数之间的天数，为此我使用上面的代码...但是当我将to datetimepicker移动到小于from datetimepicker时，它执行无限次显示消息框。如何只显示一次该消息框...

HI frnds Good Afternoon to every one,In windows application i am using two datetimepicker for "from date" and "to date" ...After choosing "to date" i need to count number of days in between "from date" and "to date" days count ,for that i used above code...but when move my "to datetimepicker" less than "from datetimepicker" it executing infinite times of showing message box.How to show only one time that message box...

答

而不是 dateTimePicker2_ValueChanged

使用 dateTimePicker2_CloseUp 事件，所以你的最终代码将是

Instead of dateTimePicker2_ValueChanged
Use dateTimePicker2_CloseUpevent , so your final code will be

private void dateTimePicker2_CloseUp(object sender, EventArgs e)
{
    DateTime fromdate = Convert.ToDateTime(dateTimePicker1.Text);
    DateTime todate1 = Convert.ToDateTime(dateTimePicker2.Text);
    if (fromdate <= todate1)
    {
        TimeSpan daycount = todate1.Subtract(fromdate);
        int dacount1 = Convert.ToInt32(daycount.Days) + 1;
        MessageBox.Show(Convert.ToString(dacount1));
    }
    else
    {
        MessageBox.Show("From Date Must be Less Than To Date");
    }
}

CloseUp 仅当用户最终选择值时才触发事件。 ValueChanged 当您更改月份时也会触发事件。

我已更正您的变量名称在代码:)运行在我的本地方框

标记为解决方案如果这解决了你的问题

谢谢......

CloseUp event is triggered only when the user finally selects a value. ValueChanged event will fire when you change the month also that was your issue.

I have corrected your variable names in code :) to run in my local box

mark it as solution if this resolved your issue

Thanks...

DateTime selectedDate = Convert.ToDateTime(dtpExpireDate.Value);
DateTime todayDate = Convert.ToDateTime(DateTime.Now);
if (selectedDate < todayDate)
{
    MessageBox.Show("Selected date Must be greater then Today's date");
}

我认为在来自fromDate的ClosUp事件中你可以配置类似的东西：

I think that in ClosUp event from "fromDate" you could configure something like:

dateTimePicker2.MinDate = dateTimePicker1.Value

这样，用户只能选择数据等于或在第一个日期之后。

This way, user can only choose a data equal or after the first date.

从日期到日期使用c＃Datetimepicker验证进行验证

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