VB.NET校验字符串函数

VB.NET校验字符串是否是日期

'Validate for a date
Shared Function checkdate(ByVal thisvalue As String) As String
 If Not IsDate(thisvalue) Then
 checkdate = "NULL"
 Else
 checkdate = "'" & thisvalue & "'"
 End If
 Return checkdate
End Function ' END checkdate

VB.NET检查字符串是否是数字

'~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
'Used to submit values to the database, check for empty value, replace w/ "NULL"
'~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
Shared Function checkNumber(ByVal thisvalue As String) As String
 If IsDBNull(thisvalue) Or Len(thisvalue) = 0 Or Not IsNumeric(thisvalue) Then
 checkNumber = "NULL"
 Else
 checkNumber = thisvalue
 End If
 Return checkNumber
End Function ' END checkNumber

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