ура работает!

Storehouse/StorehouseDatabaseImplement/Implements/SaleStorage.cs

@@ -4,6 +4,8 @@ using StorehouseContracts.SearchModels;
 using StorehouseContracts.StoragesContracts;
 using StorehouseContracts.ViewModels;
 using StorehouseDatabaseImplement.Models;
+using StorehouseDataModels.Models;
+using System.ComponentModel.DataAnnotations;
 
 namespace StorehouseDatabaseImplement.Implements
 {
@@ -41,12 +43,18 @@ namespace StorehouseDatabaseImplement.Implements
 
 		public SaleViewModel? Insert(SaleBindingModel model)
 		{
+			using var context = new StorehouseDatabase();
+			var product = context.Products.FirstOrDefault(p => p.Id == model.ProductId);
+			if (product == null || model.SaleNum > product.ProductNum)
+			{
+				return null;
+			}
 			var newSale = Sale.Create(model);
 			if (newSale == null)
 			{
 				return null;
 			}
-			using var context = new StorehouseDatabase();
+			product.ProductNum -= model.SaleNum;
 			context.Sales.Add(newSale);
 			context.SaveChanges();
 			return context.Sales.Include(x => x.Product).Include(x => x.Client).FirstOrDefault(x => x.Id == newSale.Id)?.GetViewModel;

Storehouse/StorehouseDatabaseImplement/Implements/SupplyStorage.cs

@@ -41,12 +41,18 @@ namespace StorehouseDatabaseImplement.Implements
 
 		public SupplyViewModel? Insert(SupplyBindingModel model)
 		{
+			using var context = new StorehouseDatabase();
+			var product = context.Products.FirstOrDefault(p => p.Id == model.ProductId);
+			if (product == null)
+			{
+				return null;
+			}
 			var newSupply = Supply.Create(model);
 			if (newSupply == null)
 			{
 				return null;
 			}
-			using var context = new StorehouseDatabase();
+			product.ProductNum += model.SupplyNum;
 			context.Supplys.Add(newSupply);
 			context.SaveChanges();
 			return context.Supplys.Include(x => x.Product).Include(x => x.Provider).FirstOrDefault(x => x.Id == newSupply.Id)?.GetViewModel;

Storehouse/StorehouseDatabaseImplement/Migrations/20240515071016_FirstMigration.Designer.cs

@@ -11,7 +11,7 @@ using StorehouseDatabaseImplement;
 namespace StorehouseDatabaseImplement.Migrations
 {
     [DbContext(typeof(StorehouseDatabase))]
-    [Migration("20240515061146_FirstMigration")]
+    [Migration("20240515071016_FirstMigration")]
     partial class FirstMigration
     {
         /// <inheritdoc />