Filter for enum values don't use specified converters in drop down (equals, not equals)

[Christian]

Hello everyone,

we have a simple RadGridView with one column bound to a enum property of a view model with a converter:

<telerik:GridViewDataColumn DataMemberBinding="{Binding SomeValue, Converter={StaticResource TestConverter}}" />

ViewModel:

public class TestViewModel {
    public TestEnum SomeValue { get; set; }
}
public enum TestEnum {
    A,
    B,
    C
}

And the converter code simply translates the bound enum value to a more readable text:

public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) {
    var test = (TestEnum)value;
    switch (test) {
        case TestEnum.A: return "TestEnum with Value A";
        case TestEnum.B: return "TestEnum with Value B";
        case TestEnum.C: return "TestEnum with Value C";
    }
    throw new NotImplementedException();
}

The grid is rendered correctly ("TestEnum with Value A"), but all drop downs located in the extended filter are using the raw values ("A", "B", "C") of our enum and not the transformed values for our converter.

Is there a way to work around this issue (beside translating the values prior to binding, i.e. coding a seconding property and doing the translation without a converter)?

Version: RadControls for WPF Q1 2011

FYI - I can provide a simple c# test project in order to reproduce the issue if needed.

Your sincerely,

Christian

[Rossen Hristov]

Hello Christian,

Unfortunately, the combo can't respect the IValueConverter.

But...

If you add a Description attribute to each Enum value it will be respected by the combo. So if you add Descriptions with the same strings as the ones in the value converter you should see them in the combo.

You can even re-write your converter to read the Description of each enum value and return its value. In this way you will have the string only at one place, i.e. in the Description attribute.

I hope this helps.

Kind regards,
Ross
the Telerik team

[Christian]

Hi Ross,

thanks! But that's not an option (at least in that case), because our converter is a language converter, which means it's runtime depend which value is returned:

<telerik:GridViewDataColumn  DataMemberBinding="{Binding Type, Converter={StaticResource LanguageConverter}" />

LanguageConverter takes the value of "Type" and looks it up in a .NET resource file depending on the current culture of the user. As far as I know a DescriptionAttribute(string text) is only a compile time attribute and thus cannot be changed by the runtime :-(.

Christian

[Rossen Hristov]

Hi Christian,

Then your only option would be to build your very own filtering control and do anything that you want inside it.

I hope this helps.

Kind regards,
Ross
the Telerik team

[Christian]

Hi Ross,

oh cool, didn't think of that!

But I guess I stick to translating the property in my viewmodel and then binding to an already translated value.

Christian