How to access the value of the DisplayMemberPath of a ComboBox Column from a calculated field

[Jonx]

Hello,

I base my question on the following help entry to illustrate my problem:

http://www.telerik.com/help/silverlight/radgridview-columns-column-types-combobox-column.html

I'm using RIA WCF Services in case it helps...

You got the following grid:

Country, wth the combobox, FirstName, LastName, Origin.

What I want is display in the Origin column the result of a computed value.

For exemple, I would display "Fernando Alonso is from Spain" once I selected spain in the first column using the combobox.

This should work local, no server roundtrip...

I'm using Presentation Model. My Class on the server is for example:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.ServiceModel.DomainServices.Server;
using System.ComponentModel.DataAnnotations;

namespace MyWeb
{
    public class MyPresentationModel
    {
        [Key]
        public int MyID { get; set; }

        public string FirstName { get; set; }

        public string LastName { get; set; }
    }
}

And on my local silverlight project I add the calculated field:

using System;
using System.Collections.Generic;
using System.Linq;
using System.ServiceModel.DomainServices.Client;

namespace MyWeb
{
    public partial class MyPresentationModel : Entity
    {
        public string Origin
        {
            get
            {
                string country = ???; //how to get the country from the country ID???
                string origin = String.Format("{0} {1} is from {2}.", this.FirstName, this.LastName, country);
                return origin;
            }
        }
    }
}

Of course this is just a simple sample to illustrate my problem. My object is much more complicated.

But short said, this is my problem. How to access to those values... Hoppefully there is a simple solution as I've been struggling with this for a couple of days now...

Thank you for your help...

John.

[Pavel Pavlov]

Hello John,

I am afraid this would be hard to achieve. RadGridView makes all the lookup conversion from Value to DisplayValue at the UI level .

Having a reference in your business object( e.g. MyWEeb)  to RadGridView would not be a nice solution.
I would recommend to write your own method in the MyWeb object to convert from value to display value without refering to the RadGridView.

Best wishes,
Pavel Pavlov
the Telerik team

[Jonx]

ok, thank you for your insight, I'll try to do that... I wished there was an easier way...

thanks again.