// 将指定的商品归类到指定的商品分类中。
public ProductCategorization Categorize(Product product, Category category)
{
if(product == null)
throw new ArgumentNullException("product");
if(category == null)
throw new ArgumentNullException("category");
var productCategorization =
_productCategorizationRepository.GetBySpecification(
Specification<ProductCategorization>.Eval(c => c.ProductId == product.Id));
if (productCategorization == null)
{
productCategorization = ProductCategorization.CreateCategorization(product, category);
_productCategorizationRepository.Add(productCategorization);
}
else
{
productCategorization.CategoryId = category.Id;
_productCategorizationRepository.Update(productCategorization);
}
_repositoryContext.Commit();
return productCategorization;
}
public void Add(Category aggregateRoot)
{
throw new System.NotImplementedException();
}
// 将指定的商品从其所属的商品分类中移除
public void Uncategorize(Product product, Category category = null)
{
Expression<Func<ProductCategorization, bool>> specExpress = null
;
if (category == null)
specExpress = p => p.ProductId == product.Id;
else
specExpress = p => p.ProductId == product.Id && p.CategoryId == category.Id;
var productCategorization = _productCategorizationRepository.GetByExpression(specExpress);
if (productCategorization == null) return;
_productCategorizationRepository.Remove(productCategorization);
_repositoryContext.Commit();
}
// 通过商品对象和分类对象来创建商品分类对象
public static ProductCategorization CreateCategorization(Product product, Category category)
{
return new ProductCategorization(product.Id, category.Id);
}