如何检查给定值或字符串是否为datetime？ [英] How to check give value or string is datetime or not ?

问题描述

Hi
如何在vb中检查给定值或字符串是否为datetime

例如：用户可以给出这样的值100-10-6-1，实际上是100- 10-6-1是序列号，所以如何使用vb在asp.net中检查这是否是日期时间。

Hi How to check given value or string is datetime or not in vb.
E.g:User can give value like this 100-10-6-1,actually "100-10-6-1" is serial no,so how to check this is datetime or not in asp.net using vb.

'Below all not working correctly

 Dim value1 As String = "100-10-6-1"
 Dim inta As DateTime
 If (Not DateTime.TryParse(value1, inta)) Then
 ShowMessage("This is not date field !")
 Exit Sub
 End If
'--------------------------------------
  Dim value1 As String = "100-10-6-1" 'Here if give "11-11-11" also goes else part
 If stringSplit(inti).[GetType]() Is GetType(DateTime) Then
  ShowMessage("This is  date field !")
  Else
  ShowMessage("This is not date field !")
 End If

我尝试过：



http://stackoverflow.com/questions/3998685/how-to-determine-if-an-object-is-a-datetime-in-vb-net



我试试这个链接，但是显示错误

http://prntscr.com/a4rwsk









问候

Aravind

What I have tried:

http://stackoverflow.com/questions/3998685/how-to-determine-if-an-object-is-a-datetime-in-vb-net

I try this link ,but it show error
http://prntscr.com/a4rwsk




Regards
Aravind

推荐答案

Stack Overflow解决方案不适合您，因为您的数据类型无论如何都是字符串。您应该确定这样的字符串是否是 DataTime 值的有效表示。 Fopr的目的是你可以使用 DateTime.TryParse方法（系统） [ ^ ]或日期时间.TryParseExact方法（系统） [ ^ ]。

The Stack Overflow solution doesn't work for you, because your data type is anyway a string. You should establish if such a string is a valid representation of a DataTime value. Fopr the purpose you may use either the DateTime.TryParse Method (System)[^] or DateTime.TryParseExact Method (System)[^].

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