我该如何用日期检查null?这是我尝试的..
Dim playDate As Date =
order.SelectPlayDate(Guid.Parse(returnedItem.orderID))
If playDate Not IsNull Then
calendar1.SelectedDate = playDate
End If
更新:
错误,因为您声明为plateDate的值可以返回null。您应该首先检查此" order.selectplaydate(guid.parse(recthItem.orderID((">
也许喜欢(未测试(:
If order.SelectPlayDate(Guid.Parse(returnedItem.orderID)) <> Nothing Then
calendar1.SelectedDate = order.SelectPlayDate(Guid.Parse(returnedItem.orderID))
End If
或首先声明。取决于您。