Binding column filter to converted value

Question

 So there is a data model with 2 properties: first name and last name.

I'm using custom converter to present this value "last name, first name" with logic behind it, that whenever one of the properties is null, converter returns null.
In this situation i also want a telerik filter on column but there is a problem bacause don't bind to converted value but to raw data.

Is there any way to handle this, and have both converted string and filter that is bind to it?

Here's code xaml/silverlight:

<RadGridView ItemsSource="{Binding PersonCollection}">

<telerik:GridViewDataColumn Header="Name" DataMemberBinding="{Binding Converter={StaticResource FirstLastNameConverter}}" /> 

</RadGridView>

Default telerik is not shown because binding here is to whole person object

And Person model (cannot change that or make wrapper around it):

public class Person
{
  public string FirstName { get; set; }
  public string LastName { get; set; }
}

And how would such a ColumnFilter look like in markup? I know (and loathe) some of the telerik controls but nerver used or seen the columnFilter you are mentioning. — Martin
@Martin By saying telerik filter i mean the standard default one from radgridview pic of that filter — UnderNotic
Well and how would you declare in the xaml markup that such a filter shall be visible for your DataColumn "Name"? — Martin
@Martin I don't have to declare it, it's enabled by default but there is a property FilterMemberPath, where i can bind filtering to specific binding, but this doesn't solve a problem because i want to filter not only to first name or last but on both. — UnderNotic
You could add a third property to your item type that combines firstName and lastName in the way your converter does now. — Martin

Martin Martin · Accepted Answer · 2015-07-28T12:17:01

You can use a converter to wrap each item in a custom PersonWrapper type:

<RadGridView ItemsSource="{Binding PersonCollection,
    Converter={StaticResource ItemWrappingConverter}}">...</...>

and code

public class ItemWrappingConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object param, CultureInfo cultur)
    {
        var persons = value as IEnumerable<Person>;
        if (persons == null) return null;
        return persons.Select(person => new PersonWrapper()
        {
            Person = person,
            FullName = GetFullName(person.FirstName, person.LastName)
        } );
    }

    public object ConvertBack(object value, Type targetT, object param, CultureInfo culture)
    { throw new NotSupportedException(); }
}

public class PersonWrapper
{
    public Person Person { get; set; }
    public string FullName { get; set; }
}

Binding column filter to converted value

2 Answers