主题：[求助]切换用户

代码无空值判断,而表内那么多空值的表名列名, 不出错就有鬼了吧- -

For Each t As Table In Tables '显示所有表和列
    t.Visible = True
    t.AllowEdit = True
    For Each c As Col In t.Cols
        c.Visible = True
        c.AllowEdit = True
    Next
Next
Tables("授权表").Visible = (User.Type <> UserTypeEnum.User )
If  User.Type = UserTypeEnum.User Then
    For Each dr As DataRow In DataTables("授权表").Select("用户名 = '" & User.Name & "'" )
   If dr("窗口不可见") = 0 Then
              Forms(dr("窗口名")).Show()
Else
              Forms(dr("窗口名")).Close()
End If    

If dr.IsNull("列名") Then
            Tables(dr("表名")).Visible = Not dr("不可见")
            Tables(dr("表名")).AllowEdit = Not dr("不可编辑")
        Else if dr.IsNull("表名") = false then

            Tables(dr("表名")).Cols(dr("列名")).Visible = Not dr("不可见")
            Tables(dr("表名")).Cols(dr("列名")).AllowEdit = Not dr("不可编辑")            
        End If
    Next
End If