async Task InitializeUpdateAsync()
{
var result = await ProductGateway.GetProductByIdWithCategoriesAndAttributes(ProductId);
if (result.IsValid)
{
var(product, categories, attributes) = result.Success;
Categories = categories;
Attributes = attributes.ToList();
Product = product;
EditContext = new EditContext(Product);
}
IsValid = result.IsValid;
}