主题：请教复选框筛选

With e.Form.Controls("是否采购")
    If Filter > "" Then
        Filter = Filter & " And "
    End If
    If .checked Then
        Filter = Filter & "是否采购 = true "
    Else
        Filter = Filter & "(是否采购 = false or 是否采购 is null)"
    End If
End With