如何在VB.NET中将Date变量设置为null

Question

我想将DOB变量指定为null.

Dim DOB As Date = DTPSdob.Value
Dim datestring As String = DOB.ToString("d")
If chkSdob.Checked = False Then
      DOB = 'I want to assign here DOB variable as null'
Else
      DOB = datestring
End If

Answer 1

使用可空的日期时间

    Dim DOB As Nullable(Of Date) = Date.Now
    Dim datestring As String = DOB.Value.ToString("d")
    DOB = Nothing