修改

TeamAAS-VM/ViewModels/Product/ProductHomeViewModel.cs

@@ -261,6 +261,9 @@ namespace TeamAAS_VP.ViewModels.Product
             if (!(product is ProductModel))
                 return;
             NavigationParameters parameters = new NavigationParameters();
+            Products = new ObservableCollection<ProductModel>(_productService.GetAllProducts());
+            SelectProduct = Products.FirstOrDefault(p => p.ID == ((ProductModel)product).ID);
+            if (SelectProduct == null) return;
             parameters.Add("SelectProduct", SelectProduct);
             _regionManager.RequestNavigate("ProductRegionContext", "ProductDescription", parameters);
         }