oap_labs/Model/JsonDataProvider.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.Text;
using System.Threading.Tasks;
using System.Runtime.Serialization.Json;
using System.IO;

namespace exam.Model
{
    public class JsonDataProvider : IDataProvider
    {
        private List<Clothes> clothes;
        public JsonDataProvider()
        {
            var serializer = new DataContractJsonSerializer(typeof(Clothes[]));
            using(var sr = new StreamReader("./clothes.json"))
            {
                clothes = ((Clothes[])serializer.ReadObject(sr.BaseStream)).ToList();
            }
        }
        public IEnumerable<Clothes> GetClothes()
        {
            return clothes;
        }
        public IEnumerable<ClothesBrand> GetClothesBrands()
        {
            return clothes.DistinctBy(b => b.Brand).Select(b=>new ClothesBrand {Title = b.Title});
        }
        public IEnumerable<ClothesCategory> GetClothesCategories()
        {
            return clothes.DistinctBy(b => b.Category).Select(b => new ClothesCategory { Title = b.Title});
        }
        public IEnumerable<ClothesPrice> GetClothesPrices()
        {
            return new ClothesPrice[]
            {
                new ClothesPrice{Title = "До 10.000", PriceFrom = 0, PriceTo = 10000},
                new ClothesPrice{Title = "От 10.000 до 30.000", PriceFrom = 10000, PriceTo = 30000},
                new ClothesPrice{Title = "От 30.000 до 70.000", PriceFrom = 30000, PriceTo = 80000},
                new ClothesPrice{Title = "Дороже 70.000", PriceFrom = 70000, PriceTo = 300000}
            };
        }
    }
}