.net - 具有现在(日期)默认值的可选参数

Question

如何为可选参数分配默认日期时间 ( Now ) 值。

将 now 对象分配给以下错误的可选参数时

Constant expression is required

代码:

Public Sub ReminderMail(Optional ByVal ReminderMailDate As DateTime = Now)

// Code Block

End Sub 

Answer 1

尝试这个 :

Public Sub ReminderMail(Optional ByVal ReminderMailDate As DateTime = Nothing)

If ReminderMailDate = Nothing Then ReminderMailDate = Now

// Code Block

End Sub