c# - 无法隐式转换类型，但已经转换

Question

无法隐式转换类型问题。但在这里它被转换和分配。谁能告诉我这里有什么问题？在这里，我发布了完整的代码。

 [HttpGet]
    public ActionResult AddProduct(int? id)
    {
        Models.ProductsModels.Products product = new Models.ProductsModels.Products();

        ViewBag.ListOfCategories = new SelectList(_cat.GetCategory(), "CategoryId", "CategoryName");
        ViewBag.ListOfBrands = new SelectList(_brad.GetAllBrands(), "BrandId", "BrandName");

        int productId = id ?? 0;

        if (id.HasValue)
        {
            ICS.Data.Product _prod = new ICS.Data.Product();
            product = (new ProductController()).GetProductById(productId);
            product.ProductId = _prod.ProductId;
            product.ProductName = _prod.ProductName;
            product.CategoryId = _prod.Category_CategoryId;
            product.BrandId = _prod.Brand_BrandId;
            product.PriceSettings = _prod.IsFixed;
            product.PurchasePrice = (float)_prod.PurchasePrice;
            product.ItemPrice = (float)_prod.ItemPrice;
            product.Vat = (double)_prod.Vat;
            product.WholeSalePrice = (float)_prod.WholeSalePrice;
            product.RetailPrice = (float)_prod.RetailPrice;
            product.Comments = _prod.Comments;         
        }

        return View(product);
    }

最后回到产品视图。

Answer 1

在你的代码中改变它：

_prod = (new ProductController()).GetProductById(productId);

完整代码：

[HttpGet]
    public ActionResult AddProduct(int? id)
    {
        Models.ProductsModels.Products product = new Models.ProductsModels.Products();

        ViewBag.ListOfCategories = new SelectList(_cat.GetCategory(), "CategoryId", "CategoryName");
        ViewBag.ListOfBrands = new SelectList(_brad.GetAllBrands(), "BrandId", "BrandName");

        int productId = id ?? 0;

        if (id.HasValue)
        {
            ICS.Data.Product _prod = (new ProductController()).GetProductById(productId);
            product.ProductId = _prod.ProductId;
            product.ProductName = _prod.ProductName;
            product.CategoryId = _prod.Category_CategoryId;
            product.BrandId = _prod.Brand_BrandId;
            product.PriceSettings = _prod.IsFixed;
            product.PurchasePrice = (float)_prod.PurchasePrice;
            product.ItemPrice = (float)_prod.ItemPrice;
            product.Vat = (double)_prod.Vat;
            product.WholeSalePrice = (float)_prod.WholeSalePrice;
            product.RetailPrice = (float)_prod.RetailPrice;
            product.Comments = _prod.Comments;         
        }

        return View(product);
    }