'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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