主题：筛选代码能否简化

Dim Filter As String
With e.Form.Controls("cmbProduct")
    If .Value IsNot Nothing Then
        Filter = "产品 = '" & .Value & "'"
    End If
End With
With e.Form.Controls("cmbCustomer")
    If .Value IsNot Nothing Then
        If Filter > "" Then
            Filter = Filter & " And "
        End If
        Filter = Filter & "客户 = '" & .Value & "'"
    End If
End With
With e.Form.Controls("cmbEmployee")
    If .Value IsNot Nothing Then
        If Filter >"" Then
            Filter = Filter & " And "
        End If
        Filter = Filter & "雇员 = '" & .Value & "'"
    End If
End With
With e.Form.Controls("StartDate")
    If .Value IsNot Nothing Then
        If Filter >"" Then
            Filter = Filter & " And "
        End If
        Filter = Filter & "日期 >= #" & .Value & "#"
    End If
End With
With e.Form.Controls("EndDate")
    If .Value IsNot Nothing Then
        If Filter >"" Then
            Filter = Filter & " And "
        End If
        Filter = Filter & "日期 <= #" & .Value & "#"
    End If
End With
If e.Form.Controls("rdoYifu").Checked = True ' 如果付款状态选择了"已付"
    If Filter >"" Then
        Filter = Filter & " And "
    End If
    Filter = Filter & "已付款 = True"
End If
If e.Form.Controls("rdoWeifu").Checked = True ' 如果付款状态选择了"未付"
    If Filter >"" Then
        Filter = Filter & " And "
    End If
    Filter = Filter & "已付款 = False Or 已付款 Is Null"
End If
If Filter > "" Then
    Tables("订单").Filter = Filter
End If

帮助文件中窗口筛选的代码，如果把窗口中的控件的名称和表中对应列的名称设置成一样的，能不能把这段代码简化一下。比如用FOR EACH语句实现。最好是能把这段写成一段通用的内部函数就更好了。请老师指导一下