添加分类和标签，级联数据

第一步定义类

 /// <summary>
    /// 控制面板中 商品分类
    /// ZKCloud.Shop.Product.Domain.CallBacks.ProductCalssRelation
    /// </summary>
    [ClassProperty("商品分类", Icon = "fa-diamond", Description = "商品分类", PageType = ViewPageType.List, Mark = 1)]
    public class ProductClassRelation : IRelation {

    }
    /// <summary>

    /// <summary>
    /// 支付测试
    /// </summary>
    [ClassProperty("运费模板", Icon = "fa fa-eraser", Url = "/Admin/DeliveryTemplate/list", Description = "运费模板", SortOrder = 21)]
    public class CMSControl : IControl {

    }

第二步：在视图中使用TagHelper引用

  <recursive for="Classes" filter="ZKCloud.Shop.Product.Domain.CallBacks.ProductClassRelation"
                   root="0" mode="Tree"></recursive>

<recursive for="Tags" filter="ZKCloud.Shop.Product.Domain.CallBacks.ProductTagRelation"
                   root="0" mode="Tag"></recursive>

第三步：在服务中保存数据 （使用事物）

   Resolve<IRelationIndexService>().AddUpdateOrDelete<ProductClassRelation>(product.Id, request.Form["Classes"].ToStr());
   Resolve<IRelationIndexService>().AddUpdateOrDelete<ProductTagRelation>(product.Id, request.Form["Tags"].ToStr());

 var context = Repository<ProductRepository>().RepositoryContext;
            context.BeginTransaction();
            try {

                List<RelationIndex> relationIndexAddList = new List<RelationIndex>();
                //商品添加
                if (product.Id == 0) {
                    result = Add(product);
                    product.Id = result.Id.ToInt64();
                }
                else {
                    result = Update(product);
                }
                //添加商品分类和标签
                Resolve<IRelationIndexService>().AddUpdateOrDelete<ProductClassRelation>(product.Id, request.Form["Classes"].ToStr());
                Resolve<IRelationIndexService>().AddUpdateOrDelete<ProductTagRelation>(product.Id, request.Form["Tags"].ToStr());

               
                context.SaveChanges();
                context.CommitTransaction();
            }
            catch (Exception ex) {
                context.RollbackTransaction();
                return ServiceResult.FailedWithMessage("更新失败:" + ex.Message);
            }
            finally {
                context.DisposeTransaction();
            }