Ладно

Contracts/SearchModels/ProductSearchModel.cs

@@ -10,7 +10,9 @@ namespace Contracts.SearchModels
 	{
 		public Guid? Id { get; set; }
 		public string? Name { get; set; }
-		public double? Price { get; set; }
-		public double? Rate { get; set; }
+		public double? PriceFrom { get; set; }
+		public double? PriceTo { get; set; }
+		public double? RateFrom { get; set; }
+		public double? RateTo { get; set; }
 	}
 }

DatabaseImplement/Implements/ProductStorage.cs

@@ -0,0 +1,72 @@
+using Contracts.BindingModels;
+using Contracts.SearchModels;
+using Contracts.StorageContracts;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DatabaseImplement.Implements
+{
+	public class ProductStorage : IProductStorage
+	{
+		public ProductBindingModel? Delete(ProductSearchModel model)
+		{
+			if (model.Id is null && model.Name is null && model.Price is null && model.Rate is null)
+			{
+				return null;
+			}
+
+			var context = new Database();
+			var product = context.Products.FirstOrDefault(p =>
+				(model.Id.HasValue && p.Id == model.Id) || (!string.IsNullOrEmpty(p.Name) && p.Name.Contains(model.Name)));
+
+			if (product is null)
+			{
+				return null;
+			}
+			context.Remove(product);
+			context.SaveChanges();
+
+			return product.GetBindingModel();
+		}
+
+		public ProductBindingModel? GetElement(ProductSearchModel model)
+		{
+			if (model.Id is null && string.IsNullOrWhiteSpace(model.Name))
+			{
+				return null;
+			}
+			var context = new Database();
+			return context.Products
+				.FirstOrDefault(prod => (model.Id.HasValue && prod.Id == model.Id)
+					|| (!string.IsNullOrWhiteSpace(model.Name) && prod.Name.Contains(model.Name)))?.GetBindingModel();
+		}
+
+		public IEnumerable<ProductBindingModel> GetList(ProductSearchModel? model)
+		{
+			if (model.Id is null && string.IsNullOrWhiteSpace(model.Name) || model.RateFrom > model.RateTo)
+			{
+				return null;
+			}
+			var context = new Database();
+			return context.Products
+				.Where(prod => (model.Id.HasValue && prod.Id == model.Id)
+					|| (!string.IsNullOrWhiteSpace(model.Name) && prod.Name.Contains(model.Name))
+					|| ((model.RateFrom.HasValue && model.RateTo.HasValue) && ((model.RateFrom < prod.Rate && prod.Rate < model.RateTo)))
+					|| ((model.PriceFrom.HasValue && model.PriceTo.HasValue) && ((model.PriceFrom < prod.Price && prod.Price < model.PriceTo))))
+				.Select(r => r.GetBindingModel()); ;
+		}
+
+		public ProductBindingModel? Insert(ProductBindingModel model)
+		{
+			throw new NotImplementedException();
+		}
+
+		public ProductBindingModel? Update(ProductBindingModel model)
+		{
+			throw new NotImplementedException();
+		}
+	}
+}

DatabaseImplement/Implements/PurchaseStorage.cs

@@ -0,0 +1,39 @@
+using Contracts.BindingModels;
+using Contracts.SearchModels;
+using Contracts.StorageContracts;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DatabaseImplement.Implements
+{
+	public class PurchaseStorage : IPurchaseStorage
+	{
+		public PurchaseBindingModel? Delete(PurchaseSearchModel model)
+		{
+			throw new NotImplementedException();
+		}
+
+		public PurchaseBindingModel? GetElement(PurchaseSearchModel model)
+		{
+			throw new NotImplementedException();
+		}
+
+		public IEnumerable<PurchaseBindingModel> GetList(PurchaseSearchModel? model)
+		{
+			throw new NotImplementedException();
+		}
+
+		public PurchaseBindingModel? Insert(PurchaseBindingModel model)
+		{
+			throw new NotImplementedException();
+		}
+
+		public PurchaseBindingModel? Update(PurchaseBindingModel model)
+		{
+			throw new NotImplementedException();
+		}
+	}
+}

DatabaseImplement/Implements/SellStorage.cs

@@ -0,0 +1,39 @@
+using Contracts.BindingModels;
+using Contracts.SearchModels;
+using Contracts.StorageContracts;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DatabaseImplement.Implements
+{
+	public class SellStorage : ISellStorage
+	{
+		public SellBindingModel? Delete(SellSearchModel model)
+		{
+			
+		}
+
+		public SellBindingModel? GetElement(SellSearchModel model)
+		{
+			throw new NotImplementedException();
+		}
+
+		public IEnumerable<SellBindingModel> GetList(SellSearchModel? model)
+		{
+			throw new NotImplementedException();
+		}
+
+		public SellBindingModel? Insert(SellBindingModel model)
+		{
+			throw new NotImplementedException();
+		}
+
+		public SellBindingModel? Update(SellBindingModel model)
+		{
+			throw new NotImplementedException();
+		}
+	}
+}