oap_labs/WpfApp2/model/IDataProvider.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace WpfApp2.model
{
    class Globals
    {
        public static IDataProvider dataProvider;

        IEnumerable<ClientPrice> getClientPrice()
        {
            return new ClientPrice[] {
                new ClientPrice{title="Все цены", PriceFrom=500, PriceTo=30000},
                new ClientPrice{title="Низкая цена", PriceFrom=500, PriceTo=3000},
                new ClientPrice{title="Средняя цена", PriceFrom=3000, PriceTo = 15000},
                new ClientPrice{title="Высокая цена", PriceFrom=15000, PriceTo=30000},
            };
        }

        IEnumerable<ClientCategory> getClientCategory()
        {
            return new ClientCategory[]
            {
                    new ClientCategory { title = "По России" },
                    new ClientCategory { title = "За границей" },
            };
        }

    }
}