当用户选择超过 1 天然后单击半天的复选框时如何显示错误消息？

Question

我有两个日期选择器，分别是 datepickerFrom 和 datepickerto。我想在用户选择超过 1 天并选中半天复选框然后单击按钮提交时显示错误消息，它将显示错误消息。

例如：A 选择 1/6/2022 - 3/6/2022，然后点击复选框选择半天。当 A 单击提交按钮时，它会显示一条错误消息，例如“抱歉，半天不能选择超过 1 个日期！”

这是我检查错误的代码

Private Function ErrorFree() As Boolean 

If datepickerFrom.Date > datepickerto.Date Then 
   If chkHalfDay.Checked = True Then 
       DisplayMessage("error", "ERROR", "Sorry, You can't pick more than 1 date for half day!")
   Return False
   Exit Function
   End If
End If
Return True
End Function

Answer 1

终于找到答案了！所以这是代码。然后我调用 datepickerFrom_DateChanged 和 datepickerto_DateChanged 中的函数。

    Private Function CalculateDaysBetweenDates() As Integer
        Dim dateFrom As DateTime = Convert.ToDateTime(datepickerFrom.Date)
        Dim dateTo As DateTime = Convert.ToDateTime(datepickerto.Date)
        Dim ts As TimeSpan = dateTo.Subtract(dateFrom)
        If Convert.ToInt32(ts.Days) > 0 Then

            radHalfday.Enabled = False
        Else
            radHalfday.Enabled = True
        End If
        Return 1
    End Function

当用户选择超过 1 天然后单击半天的复选框时如何显示错误消息？

How to display error message when user pick more than 1 day then click the checkbox for halfday?

vb.net

checkbox

datepicker

visual-studio