исправление тупой ошибки

SushiBar/SushiBarDatabaseImplement/Models/Shop.cs

@@ -28,8 +28,18 @@ namespace SushiBarDatabaseImplement.Models
             {
                 if (_shopSushi == null)
                 {
-                    _shopSushi = ListSushiFk
-                            .ToDictionary(recPC => recPC.SushiId, recPC => (recPC.Sushi as ISushiModel, recPC.Count));
+                    _shopSushi = new();
+                    ListSushiFk.ForEach(x =>
+                    {
+                        if (_shopSushi.ContainsKey(x.SushiId))
+                        {
+                            _shopSushi[x.SushiId] = (x.Sushi as ISushiModel, _shopSushi[x.SushiId].Item2 + x.Count);
+                        }
+                        else
+                        {
+                            _shopSushi[x.SushiId] = (x.Sushi as ISushiModel, x.Count);
+                        }
+                    });
                 }
                 return _shopSushi;
             }