oap_labs/Model/PhoneClass.cs

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

namespace wpf_template.Model
{
    public class Product
    {
        public string Title { get; set; }
        public string Company { get; set; }    
        public int Price { get; set; }
        public string Category { get; set; }
        public string Photo { get; set; }
    }

    public class ProductCategory
    {
        public string title { get; set; }
    }

    public class ProductPrice
    {
        public string title { get; set; }
        public int priceFrom { get; set; }
        public int priceTo { get; set; }
    }

    public class ProductCompany
    {
        public string title { get; set; }
    }

    interface IDataProvider
    {
        IEnumerable<Product> GetProducts();
        IEnumerable<ProductCategory> GetCategories();
        IEnumerable<ProductPrice> GetPrices();
        IEnumerable<ProductCompany> GetCompanies();
    }

    public class LocalDataProvider : IDataProvider
    {
        public IEnumerable<Product> GetProducts()
        {
            return new Product[]{
            new Product
            {
                Category = "Смартфон",
                Company = "Apple",
                Title = "13 Pro Max",
                Price = 84999
            },
            new Product
            {
                Category = "Смартфон",
                Company = "Samsung",
                Title = "S23",
                Price = 89999
            },
            new Product
            {
                Category = "Смартфон",
                Company = "Huawei",
                Title = "Nova Y61",
                Price = 9999
            },
            new Product
            {
                Category = "Смартфон",
                Company = "POCO",
                Title = "C51",
                Price = 5599
            },
            new Product
            {
                Category = "Ноутбук",
                Company = "Xiaomi",
                Title = "RedmiBook 15",
                Price = 49999
            },
            new Product
            {
                Category = "Ноутбук",
                Company = "Asus",
                Title = "Vivobook Go 15",
                Price = 25999
            },
            new Product
            {
                Category = "Ноутбук",
                Company = "Lenovo",
                Title = "IdeaPad 1",
                Price = 24999
            },
            new Product
            {
                Category = "Ноутбук",
                Company = "Asus",
                Title = "ExpertBook B1502",
                Price = 32999
            },
            new Product
            {
                Category = "Смарт-Часы",
                Company = "Apple",
                Title = "SE 2023",
                Price = 30599
            },
            new Product
            {
                Category = "Смарт-Часы",
                Company = "Xiaomi",
                Title = "Smart Band 8",
                Price = 3999
            },
            new Product
            {
                Category = "Смарт-Часы",
                Company = "Huawei",
                Title = "Watch GT 4",
                Price = 13999
            },

            };
        }

        public IEnumerable<ProductCategory> GetCategories()
        {
            return new ProductCategory[]
            {
                new ProductCategory {title = "Смартфон"},
                new ProductCategory {title = "Ноутбук"},
                new ProductCategory {title = "Смарт-Часы"},
                new ProductCategory {title = "Монитор"}
            };
        }

        public IEnumerable<ProductPrice> GetPrices()
        {
            return new ProductPrice[]
            {
                new ProductPrice{title="Все цены", priceFrom = 0, priceTo = 999999},
                new ProductPrice{title="До 10.000", priceFrom = 0, priceTo = 10000},
                new ProductPrice{title="От 10.000 до 20.000", priceFrom = 10000, priceTo = 20000},
                new ProductPrice{title="От 20.000 до 50.000", priceFrom = 20000, priceTo = 50000},
                new ProductPrice{title="Дороже 50.000", priceFrom = 50000, priceTo = 999999 }
            };
        }
        public IEnumerable<ProductCompany> GetCompanies()
        {
            return new ProductCompany[]
            {
                new ProductCompany{title = "Apple"},
                new ProductCompany{title = "Xiaomi"},
                new ProductCompany{title = "Huawei"},
                new ProductCompany{title = "POCO"},
                new ProductCompany{title = "Asus"},
                new ProductCompany{title = "Lenovo"},
                new ProductCompany{title = "Samsung"}
            };
        }
            
    }
}