Question

vb.net DateTimePicker默认值可以为空吗?

Answer 1

Public Class Form1

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
DateTimePicker1.Format = DateTimePickerFormat.Custom
DateTimePicker1.CustomFormat = " "

End Sub

Private Sub DateTimePicker1_CloseUp(ByVal sender As Object, ByVal e As System.EventArgs) Handles DateTimePicker1.CloseUp
DateTimePicker1.Format = DateTimePickerFormat.Long
End Sub

End Class

Answer 2

要实现为空,请把DateTimePicker的CheckBox显示出来,未选中(Checked=False)就表示是空的,选中才能值,
效果应该能实现你的要求.

Answer 3

DateTimePicker默认值必须是一个确定的日期