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I have a WPF application using the MVVM pattern and MVVM Light Tookkit that is accesing a MSSQL server. Below would be a sample database (the database I have is more complex):

Employee Table:
|Name          | ShipToLocation
---------------|--------------------
|John          | 1

ShipToLocation Table:
|Code | CityName 
------|------------------
| 1   | New York

I have used EntityFramwork to Create Objects out of my database tables. The problem I am having is in my program now, I am having to use a lot of IValueConverters like such:

    <ListBox Grid.Row="1" Grid.ColumnSpan="3" ItemsSource="{Binding Employees}" HorizontalContentAlignment="Stretch" SelectedItem="{Binding ThisEmployee}">
        <ListBox.ItemTemplate>
            <DataTemplate>
                    <TextBlock HorizontalAlignment="Center">
                        <TextBlock.Text>
                            <MultiBinding Converter="{StaticResource IntToShipTo}">
                                <Binding Path="VendorCode" Mode="OneWay"/>
                                <Binding RelativeSource="{RelativeSource Mode=FindAncestor, AncestorType={x:Type Window}}" Path="DataContext.ShipToLocations"/>
                            </MultiBinding>
                        </TextBlock.Text>
                    </TextBlock>
            </DataTemplate>
        </ListBox.ItemTemplate>
    </ListBox>

In my ViewModel there is a property called Employees that holds a list of Emplyoyee, and a property called ShipToLocations that has a list of all Ship To Locations. I have to use the RelativeSource in order to access the ShipToLocations Property since the ItemSource of the ListBox is set to "Employees", which is causing design time view problems

I have this kind of linking going on in alot of places, and I will need to make a converter for each one. This seems like alot of overhead, and a Unit Testing nightmare.

What I was wondering was, would it be bad practice to, in my Employee Table, add a column called ShipToFriendlyName, and then attach a trigger on the ShipToLocation field that will update the frienldy name when the int is changed. This would avoid the need to be doing database calls every time I need to find out what the friendly name of the Integer is. Thank you

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1 回答 1

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我想知道的是，这会是不好的做法吗...

是的，那将是非常糟糕的做法。

于 2013-09-17T18:56:17.757 回答