/// <summary>
/// 设置产品分类
/// </summary>
/// <param name="product"></param>
/// <param name="category"></param>
/// <returns></returns>
public ProductCategorization Categorize(Product product, Category category)
{
if (product == null)
{
throw new ArgumentNullException("product");
}
if (category == null)
{
throw new ArgumentNullException("category");
}
var prdCategorization = _productCategorizationRepository.GetBySpecification(
Specification <ProductCategorization> .Eval(c => c.ProductId == product.Id));
/*对比这两个方法*/
var test = _productCategorizationRepository.GetByExpression(c => c.ProductId == product.Id);
if (prdCategorization == null)
{
prdCategorization = ProductCategorization.CreateCategorization(product, category);
_productCategorizationRepository.Add(prdCategorization);
}
else
{
prdCategorization.CategoryId = category.Id;
_productCategorizationRepository.Update(prdCategorization);
}
_repositoryContext.Commit();
return(prdCategorization);
}
// 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();
}