IceCreamShop/IceCreamShopContracts/BindingModels/OrderBindingModel.cs

@@ -13,7 +13,7 @@ namespace IceCreamShopContracts.BindingModels
     {
         public int Id { get; set; }
         public int IceCreamId { get; set; }
-		public int ImplementerId { get; set; }
+        public int? ImplementerId { get; set; } = null;
 		public int ClientId { get; set; }
         public int Count { get; set; }
         public double Sum { get; set; }

IceCreamShop/IceCreamShopContracts/ViewModels/OrderViewModel.cs

@@ -16,7 +16,7 @@ namespace IceCreamShopContracts.ViewModels
         public int Id { get; set; }
         public int IceCreamId { get; set; }
         public int ClientId { get; set; }
-        public int ImplementerId { get; set; }
+        public int? ImplementerId { get; set; } = null;
         [DisplayName("Клиент")]
         public string ClientFIO { get; set; } = string.Empty;
         [DisplayName("Мороженное")]

IceCreamShop/IceCreamShopDataModels/IOrderModel.cs

@@ -11,7 +11,7 @@ namespace IceCreamShopDataModels.Models
     {
         int IceCreamId { get; }
         int ClientId { get; }
-        int ImplementerId { get; }
+        int? ImplementerId { get; }
         int Count { get; }
         double Sum { get; }
         OrderStatus Status { get; }

IceCreamShop/IceCreamShopDatabaseImplement/Models/Order.cs

@@ -29,9 +29,9 @@ namespace IceCreamShopDatabaseImplement.Models
         [Required]
         public int ClientId { get; private set; }
         public virtual Client Client { get; private set; }
-		[Required]
-		public int ImplementerId { get; private set; }
-		public virtual Implementer Implementer { get; private set; }
+        [Required]
+        public int? ImplementerId { get; private set; } = null;
+		public virtual Implementer? Implementer { get; private set; }
 		public static Order? Create(IceCreamShopDataBase context, OrderBindingModel model)
         {
             if (model == null)
@@ -78,7 +78,7 @@ namespace IceCreamShopDatabaseImplement.Models
             IceCreamName = IceCream.IceCreamName,
             Id = Id,
             ClientFIO = Client.ClientFIO,
-            ImplementerFIO = Implementer.ImplementerFIO
+            ImplementerFIO = (Implementer != null ? Implementer.ImplementerFIO : string.Empty)
         };
 
     }

IceCreamShop/IceCreamShopFileImplement/Models/Order.cs

@@ -15,7 +15,7 @@ namespace IceCreamShopFileImplement.Models
     {
         public int Id { get; private set; }
         public int IceCreamId { get; private set; }
-		public int ImplementerId { get; private set; }
+        public int? ImplementerId { get; private set; } = null;
 		public int ClientId { get; private set; }
         public int Count { get; private set; }
         public double Sum { get; private set; }

IceCreamShop/IceCreamShopListImplement/Models/Order.cs

@@ -18,7 +18,7 @@ namespace IceCreamShopListImplement.Models
         public int Id { get; private set; }
         public int IceCreamId { get; private set; }
         public int ClientId { get; private set; }
-		public int ImplementerId { get; private set; }
+		public int? ImplementerId { get; private set; }
 		public int Count { get; private set; }
         public double Sum { get; private set; }
         public OrderStatus Status { get; private set; }