即使在我单击要显示的日期后，DateTimePicker也不显示数据

Question

我的WinForm上有一个DateTimePicker控件，启用了CheckBox属性。 在运行时，当我想选择一个日期时它没有在datetimepicker文本框中显示它，我知道我的代码是正确的，因为相同的代码正在处理我有的另一种形式，但不是在这一个！

下面是我的代码的快照，任何帮助都将不胜感激：

Private Sub btnInsert_Click(sender As Object, e As EventArgs) Handles btnInsert.Click
DateTimePicker1.Enabled = True
DateTimerPicker1.Checked = False
If DateTimePicker1.Checked = False Then
        DateTimePicker1.CustomFormat = " "
        DateTimePicker1.Format = DateTimePickerFormat.Custom
    Else
        DateTimePicker1.Format = DateTimePickerFormat.Short
    End If
End Sub

Answer 1

要处理该复选框的更改，您可以使用ValueChanged事件：

Private Sub DateTimePicker1_ValueChanged(sender As Object, e As EventArgs) _
    Handles DateTimePicker1.ValueChanged

    If Me.DateTimePicker1.Checked=True Then
       Me.DateTimePicker1.Format = DateTimePickerFormat.Short
    Else
       Me.DateTimePicker1.Format = DateTimePickerFormat.Custom
       Me.DateTimePicker1.CustomFormat = " "
     End If
End Sub

在您的代码中，您告诉它不要使用DateTimePicker1.CustomFormat = " "显示日期。

请参阅我在下面的代码中添加的评论：

DateTimerPicker1.Checked = False '<==== You set Checked to false
If DateTimePicker1.Checked = False Then  '<==== You told if not checked (it's not checked)
    DateTimePicker1.CustomFormat = " "  '<==== Show space
    DateTimePicker1.Format = DateTimePickerFormat.Custom
....