asp 空值测试判断函数


复制代码 代码如下:

'函数:空值测试
Function inull(Val)
Dim tmp
tmp = False
If IsNull(Val) Then
tmp = True
ElseIf IsEmpty(Val) Then
tmp = True
ElseIf Trim(Val) = "" Then
tmp = True
End If
inull = tmp
End Function


测试变量是否为空值,空值的含义包括:变量不存在/为空,对象为Nothing,0,空数组,字符串为空
Function IsBlank(ByRef Var)
IsBlank = False
Select Case True
Case IsObject(Var)
If Var Is Nothing Then IsBlank = True
Case IsEmpty(Var), IsNull(Var)
IsBlank = True
Case IsArray(Var)
If UBound(Var) = 0 Then IsBlank = True
Case IsNumeric(Var)
If (Var = 0) Then IsBlank = True
Case Else
If Trim(Var) = "" Then IsBlank = True
End Select
End Function


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