'函數(shù)：空值測試 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
測試變量是否為空值，空值的含義包括：變量不存在/為空，對象為Nothing，0，空數(shù)組，字符串為空 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
