/// <summary>
/// 将指定的商品从其所属的商品分类中移除。
/// </summary>
/// <param name="product">商品。</param>
/// <param name="category">分类，若为NULL，则表示从所有分类中移除。</param>
public void Uncategorize(Product product, Category category = null)
{
Expression<Func<Categorization, bool>> specExpression;
if (category == null)
// ReSharper disable ImplicitlyCapturedClosure
specExpression = p => p.ProductID == product.ID;
// ReSharper restore ImplicitlyCapturedClosure
else
specExpression = p => p.ProductID == product.ID && p.CategoryID == category.ID;
var categorization = _categorizationRepository.Find(Specification<Categorization>.Eval(specExpression));
if (categorization != null)
_categorizationRepository.Remove(categorization);
_repositoryContext.Commit();
}
/// <summary>
/// 将指定的商品归类到指定的商品分类中。
/// </summary>
/// <param name="product">需要归类的商品。</param>
/// <param name="category">商品分类。</param>
/// <returns>用以表述商品及其分类之间关系的实体。</returns>
public Categorization Categorize(Product product, Category category)
{
if (product == null)
throw new ArgumentNullException("product");
if (category == null)
throw new ArgumentNullException("category");
var categorization = _categorizationRepository.Find(Specification<Categorization>.Eval(c => c.ProductID == product.ID));
if (categorization == null)
{
categorization = Categorization.CreateCategorization(product, category);
_categorizationRepository.Add(categorization);
}
else
{
categorization.CategoryID = category.ID;
_categorizationRepository.Update(categorization);
}
_repositoryContext.Commit();
return categorization;
}
/// <summary>
/// 创建商品与分类之间的关系。
/// </summary>
/// <param name="product">商品实体。</param>
/// <param name="category">分类实体。</param>
/// <returns>描述商品与分类之间关系的实体。</returns>
public static Categorization CreateCategorization(Product product, Category category)
{
return new Categorization(product.ID, category.ID);
}
/// <summary>
/// 将指定的商品从其所属的商品分类中移除。
/// </summary>
/// <param name="product">商品。</param>
/// <param name="category">分类，若为NULL，则表示从所有分类中移除。</param>
public void Uncategorize(Product product, Category category = null)
{
Expression<Func<Categorization, bool>> specExpression = null;
if (category == null)
specExpression = p => p.ProductID == product.ID;
else
specExpression = p => p.ProductID == product.ID && p.CategoryID == category.ID;
var categorization = categorizationRepository.Find(Specification<Categorization>.Eval(specExpression));
if (categorization != null)
categorizationRepository.Remove(categorization);
repositoryContext.Commit();
}