教你一招 - 如何给nopcommerce增加新闻类别模块

nopcommerce的新闻模块一直都没有新闻类别，但是很多情况下都会使用到类别，怎么办呢，自己动手吧。

1、首先创建新闻类别表，脚本如下：

CREATE TABLE [dbo].[NewsCategory](
	[Id] [int] IDENTITY(1,1) NOT NULL,
	[Name] [nvarchar](400) NOT NULL,
	[Description] [nvarchar](max) NOT NULL,
	[ParentCategoryId] [int] NOT NULL,
	[Published] [bit] NOT NULL,
	[Deleted] [bit] NOT NULL,
	[DisplayOrder] [int] NOT NULL,
	[CreatedOn] [datetime] NOT NULL,
	[UpdatedOn] [datetime] NOT NULL,
 CONSTRAINT [PK_NewsCategory] PRIMARY KEY CLUSTERED 
(
	[Id] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]

GO

2、\Libraries\Nop.Core\Domain\News下面增加实体类，代码如下：

using System;
using System.Collections.Generic;
using Nop.Core.Domain.Localization;

namespace Nop.Core.Domain.News
{
    /// <summary>
    /// Represents a news category
    /// </summary>
    public partial class NewsCategory : BaseEntity
    {
        /// <summary>
        /// Gets or sets the name
        /// </summary>
        public virtual string Name { get; set; }

        /// <summary>
        /// Gets or sets the description
        /// </summary>
        public virtual string Description { get; set; }

        /// <summary>
        /// Gets or sets the parent category identifier
        /// </summary>
        public virtual int ParentCategoryId { get; set; }

        /// <summary>
        /// Gets or sets a value indicating whether the entity is published
        /// </summary>
        public virtual bool Published { get; set; }

        /// <summary>
        /// Gets or sets a value indicating whether the entity has been deleted
        /// </summary>
        public virtual bool Deleted { get; set; }

        /// <summary>
        /// Gets or sets the display order
        /// </summary>
        public virtual int DisplayOrder { get; set; }

        /// <summary>
        /// Gets or sets the date and time of instance creation
        /// </summary>
        public virtual DateTime CreatedOn { get; set; }

        /// <summary>
        /// Gets or sets the date and time of instance update
        /// </summary>
        public virtual DateTime UpdatedOn { get; set; }
    }
}

3、\Libraries\Nop.Data\Mapping\News下面增加新闻类别映射类，因为nopcommerce使用Entity Framework (EF) Code-First方法，
允许你在nopcommerce代码中定义实体 (所有的核心实体类都在Nop.Core中定义)，所以必须在此添加映射类，代码如下：

using System.Data.Entity.ModelConfiguration;
using Nop.Core.Domain.News;

namespace Nop.Data.Mapping.News
{
    public partial class NewsCategoryMap : EntityTypeConfiguration<NewsCategory>
    {
        public NewsCategoryMap()
        {
            this.ToTable("NewsCategory");
            this.HasKey(bp => bp.Id);
            this.Property(bp => bp.Name).IsRequired().IsMaxLength();
            this.Property(bp => bp.Description).IsRequired().IsMaxLength();
        }
    }
}

4、\Libraries\Nop.Services\News下面的INewsService.cs和NewsService.cs增加新闻类别相关操作。
INewsService.cs整理后代码如下：

using System;
using System.Collections.Generic;
using Nop.Core;
using Nop.Core.Domain.News;

namespace Nop.Services.News
{
    /// <summary>
    /// News service interface
    /// </summary>
    public partial interface INewsService
    {
        #region news

        /// <summary>
        /// Deletes a news
        /// </summary>
        /// <param name="newsItem">News item</param>
        void DeleteNews(NewsItem newsItem);

        /// <summary>
        /// Gets a news
        /// </summary>
        /// <param name="newsId">The news identifier</param>
        /// <returns>News</returns>
        NewsItem GetNewsById(int newsId);

        /// <summary>
        /// Gets all news
        /// </summary>
        /// <param name="languageId">Language identifier; 0 if you want to get all records</param>
        /// <param name="dateFrom">Filter by created date; null if you want to get all records</param>
        /// <param name="dateTo">Filter by created date; null if you want to get all records</param>
        /// <param name="pageIndex">Page index</param>
        /// <param name="pageSize">Page size</param>
        /// <param name="showHidden">A value indicating whether to show hidden records</param>
        /// <returns>News items</returns>
        IPagedList<NewsItem> GetAllNews(int languageId,
            DateTime? dateFrom, DateTime? dateTo, int pageIndex, int pageSize, bool showHidden = false);

        /// <summary>
        /// Inserts a news item
        /// </summary>
        /// <param name="news">News item</param>
        void InsertNews(NewsItem news);

        /// <summary>
        /// Updates the news item
        /// </summary>
        /// <param name="news">News item</param>
        void UpdateNews(NewsItem news);
        #endregion

        #region news category

        /// <summary>
        /// Deletes a news category
        /// </summary>
        /// <param name="category">News Category item</param>
        void DeleteNewsCategory(NewsCategory category);

        /// <summary>
        /// Gets a news category
        /// </summary>
        /// <param name="categoryId">The news category identifier</param>
        /// <returns>NewsCategory</returns>
        NewsCategory GetNewsCategoryById(int categoryId);

        /// <summary>
        /// Gets all news category
        /// </summary>
        /// <param name="pageIndex">Page index</param>
        /// <param name="pageSize">Page size</param>
        /// <param name="showHidden">A value indicating whether to show hidden records</param>
        /// <returns>News Category items</returns>
        IPagedList<NewsCategory> GetAllNewsCategory(int pageIndex, int pageSize, bool showHidden = false);

        /// <summary>
        /// Gets all news category
        /// </summary>
        /// <param name="showHidden">A value indicating whether to show hidden records</param>
        /// <returns>News Category items</returns>
        IList<NewsCategory> GetAllNewsCategory(bool showHidden = false);

        /// <summary>
        /// Inserts a news category item
        /// </summary>
        /// <param name="category">News Category item</param>
        void InsertNewsCategory(NewsCategory category);

        /// <summary>
        /// Updates the news category item
        /// </summary>
        /// <param name="category">News Category item</param>
        void UpdateNewsCategory(NewsCategory category);

        #endregion
    }
}
NewsService.cs整理后代码如下：

using System;
using System.Collections.Generic;
using System.Linq;
using Nop.Core;
using Nop.Core.Caching;
using Nop.Core.Data;
using Nop.Core.Domain.News;
using Nop.Core.Events;

namespace Nop.Services.News
{
    /// <summary>
    /// News service
    /// </summary>
    public partial class NewsService : INewsService
    {
        #region Constants
        private const string NEWS_BY_ID_KEY = "Nop.news.id-{0}";
        private const string NEWS_PATTERN_KEY = "Nop.news.";
        private const string NEWSCATEGORY_BY_ID_KEY = "Nop.newscategory.id-{0}";
        private const string NEWSCATEGORY_PATTERN_KEY = "Nop.newscategory.";
        #endregion

        #region Fields

        private readonly IRepository<NewsItem> _newsItemRepository;
        private readonly IRepository<NewsCategory> _newsCategoryRepository;
        private readonly ICacheManager _cacheManager;
        private readonly IEventPublisher _eventPublisher;

        #endregion

        #region Ctor

        public NewsService(IRepository<NewsItem> newsItemRepository, IRepository<NewsCategory> newsCategoryRepository, ICacheManager cacheManager, IEventPublisher eventPublisher)
        {
            _newsItemRepository = newsItemRepository;
            _newsCategoryRepository = newsCategoryRepository;
            _cacheManager = cacheManager;
            _eventPublisher = eventPublisher;
        }

        #endregion

        #region Methods

        #region news
        
        /// <summary>
        /// Deletes a news
        /// </summary>
        /// <param name="newsItem">News item</param>
        public virtual void DeleteNews(NewsItem newsItem)
        {
            if (newsItem == null)
                throw new ArgumentNullException("newsItem");

            _newsItemRepository.Delete(newsItem);

            _cacheManager.RemoveByPattern(NEWS_PATTERN_KEY);

            //event notification
            _eventPublisher.EntityDeleted(newsItem);
        }

        /// <summary>
        /// Gets a news
        /// </summary>
        /// <param name="newsId">The news identifier</param>
        /// <returns>News</returns>
        public virtual NewsItem GetNewsById(int newsId)
        {
            if (newsId == 0)
                return null;

            string key = string.Format(NEWS_BY_ID_KEY, newsId);
            return _cacheManager.Get(key, () =>
            {
                var n = _newsItemRepository.GetById(newsId);
                return n;
            });
        }

        /// <summary>
        /// Gets all news
        /// </summary>
        /// <param name="languageId">Language identifier; 0 if you want to get all records</param>
        /// <param name="dateFrom">Filter by created date; null if you want to get all records</param>
        /// <param name="dateTo">Filter by created date; null if you want to get all records</param>
        /// <param name="pageIndex">Page index</param>
        /// <param name="pageSize">Page size</param>
        /// <param name="showHidden">A value indicating whether to show hidden records</param>
        /// <returns>News items</returns>
        public virtual IPagedList<NewsItem> GetAllNews(int languageId,
            DateTime? dateFrom, DateTime? dateTo, int pageIndex, int pageSize, bool showHidden = false)
        {
            var query = _newsItemRepository.Table;
            if (dateFrom.HasValue)
                query = query.Where(n => dateFrom.Value <= n.CreatedOnUtc);
            if (dateTo.HasValue)
                query = query.Where(n => dateTo.Value >= n.CreatedOnUtc);
            if (languageId > 0)
                query = query.Where(n => languageId == n.LanguageId);
            if (!showHidden)
                query = query.Where(n => n.Published);
            query = query.OrderByDescending(b => b.CreatedOnUtc);

            var news = new PagedList<NewsItem>(query, pageIndex, pageSize);
            return news;
        }
        /// <summary>
        /// Inserts a news item
        /// </summary>
        /// <param name="news">News item</param>
        public virtual void InsertNews(NewsItem news)
        {
            if (news == null)
                throw new ArgumentNullException("news");

            _newsItemRepository.Insert(news);

            _cacheManager.RemoveByPattern(NEWS_PATTERN_KEY);

            //event notification
            _eventPublisher.EntityInserted(news);
        }

        /// <summary>
        /// Updates the news item
        /// </summary>
        /// <param name="news">News item</param>
        public virtual void UpdateNews(NewsItem news)
        {
            if (news == null)
                throw new ArgumentNullException("news");

            _newsItemRepository.Update(news);

            _cacheManager.RemoveByPattern(NEWS_PATTERN_KEY);

            //event notification
            _eventPublisher.EntityUpdated(news);
        }

        #endregion

        #region news category

        /// <summary>
        /// Deletes a news category
        /// </summary>
        /// <param name="category">News Category item</param>
        public virtual void DeleteNewsCategory(NewsCategory category)
        {
            if (category == null)
                throw new ArgumentNullException("category");

            _newsCategoryRepository.Delete(category);

            _cacheManager.RemoveByPattern(NEWSCATEGORY_PATTERN_KEY);

            //event notification
            _eventPublisher.EntityDeleted(category);
        }

        /// <summary>
        /// Gets a news category
        /// </summary>
        /// <param name="categoryId">The news category identifier</param>
        /// <returns>NewsCategory</returns>
        public virtual NewsCategory GetNewsCategoryById(int categoryId)
        {
            if (categoryId == 0)
                return null;

            string key = string.Format(NEWSCATEGORY_BY_ID_KEY, categoryId);
            return _cacheManager.Get(key, () =>
            {
                var n = _newsCategoryRepository.GetById(categoryId);
                return n;
            });
        }

        /// <summary>
        /// Gets all news category
        /// </summary>
        /// <param name="pageIndex">Page index</param>
        /// <param name="pageSize">Page size</param>
        /// <param name="showHidden">A value indicating whether to show hidden records</param>
        /// <returns>News Category items</returns>
        public virtual IPagedList<NewsCategory> GetAllNewsCategory(int pageIndex, int pageSize, bool showHidden = false)
        {
            var categories = GetAllNewsCategory(showHidden);
            return new PagedList<NewsCategory>(categories, pageIndex, pageSize);
        }

        /// <summary>
        /// Gets all news category
        /// </summary>
        /// <param name="showHidden">A value indicating whether to show hidden records</param>
        /// <returns>News Category items</returns>
        public virtual IList<NewsCategory> GetAllNewsCategory(bool showHidden = false)
        {
            var query = _newsCategoryRepository.Table;
            if (!showHidden)
                query = query.Where(n => n.Published);
            query = query.OrderBy(b => b.DisplayOrder);

            var unsortedCategories = query.ToList();

            //sort categories
            var sortedCategories = unsortedCategories.SortCategoriesForTree(0);
            return sortedCategories;
        }

        /// <summary>
        /// Inserts a news category item
        /// </summary>
        /// <param name="category">News Category item</param>
        public virtual void InsertNewsCategory(NewsCategory category)
        {
            if (category == null)
                throw new ArgumentNullException("category");

            _newsCategoryRepository.Insert(category);

            _cacheManager.RemoveByPattern(NEWSCATEGORY_PATTERN_KEY);

            //event notification
            _eventPublisher.EntityInserted(category);
        }

        /// <summary>
        /// Updates the news category item
        /// </summary>
        /// <param name="category">News Category item</param>
        public virtual void UpdateNewsCategory(NewsCategory category)
        {
            if (category == null)
                throw new ArgumentNullException("category");

            _newsCategoryRepository.Update(category);

            _cacheManager.RemoveByPattern(NEWSCATEGORY_PATTERN_KEY);

            //event notification
            _eventPublisher.EntityUpdated(category);
        }

        #endregion

        #endregion
    }
}

另外需要增加NewsExtensions.cs，主要用于新闻类别的排序（对无限极分类的排序等等），代码如下：

using System;
using System.Collections.Generic;
using System.Linq;
using Nop.Core.Domain.News;

namespace Nop.Services.News
{
    /// <summary>
    /// Extensions
    /// </summary>
    public static class NewsExtensions
    {
        /// <summary>
        /// Sort news categories for tree representation
        /// </summary>
        /// <param name="source">Source</param>
        /// <param name="parentId">Parent category identifier</param>
        /// <returns>Sorted categories</returns>
        public static IList<NewsCategory> SortCategoriesForTree(this IList<NewsCategory> source, int parentId)
        {
            var result = new List<NewsCategory>();

            var temp = source.ToList().FindAll(c => c.ParentCategoryId == parentId);
            foreach (var cat in temp)
            {
                result.Add(cat);
                result.AddRange(SortCategoriesForTree(source, cat.Id));
            }
            return result;
        }

        public static string GetCategoryNameWithPrefix(this NewsCategory category, INewsService newsService)
        {
            string result = string.Empty;

            while (category != null)
            {
                if (String.IsNullOrEmpty(result))
                    result = category.Name;
                else
                    result = "--" + result;
                category = newsService.GetNewsCategoryById(category.ParentCategoryId);
            }
            return result;
        }

        public static string GetCategoryBreadCrumb(this NewsCategory category, INewsService newsService)
        {
            string result = string.Empty;

            while (category != null && !category.Deleted)
            {
                if (String.IsNullOrEmpty(result))
                    result = category.Name;
                else
                    result = category.Name + " >> " + result;

                category = newsService.GetNewsCategoryById(category.ParentCategoryId);

            }
            return result;
        }

    }
}

5、到此底层的数据操作已经基本完成，开始修改后台管理部分。
Nop.Admin\Models\News\增加新闻类别页面所需要的ViewModel，代码如下：

using System;
using System.Collections.Generic;
using System.Web.Mvc;
using FluentValidation.Attributes;
using Nop.Admin.Validators.News;
using Nop.Web.Framework;
using Nop.Web.Framework.Mvc;

namespace Nop.Admin.Models.News
{
    [Validator(typeof(NewsCategoryValidator))]
    public class NewsCategoryModel : BaseNopEntityModel
    {
        public NewsCategoryModel()
        {
            AvailableCategories = new List<SelectListItem>();
        }

        [NopResourceDisplayName("Admin.ContentManagement.News.NewsCategoryItems.Fields.Name")]
        public string Name { get; set; }

        [NopResourceDisplayName("Admin.ContentManagement.News.NewsCategoryItems.Fields.Description")]
        [AllowHtml]
        public string Description { get; set; }

        [NopResourceDisplayName("Admin.ContentManagement.News.NewsCategoryItems.Fields.ParentName")]
        public int ParentCategoryId { get; set; }

        [NopResourceDisplayName("Admin.ContentManagement.News.NewsCategoryItems.Fields.ParentName")]
        public string ParentCategoryName { get; set; }

        [NopResourceDisplayName("Admin.ContentManagement.News.NewsCategoryItems.Fields.Published")]
        public bool Published { get; set; }

        [NopResourceDisplayName("Admin.ContentManagement.News.NewsCategoryItems.Fields.DisplayOrder")]
        public int DisplayOrder { get; set; }

        [NopResourceDisplayName("Admin.ContentManagement.News.NewsCategoryItems.Fields.CreatedOn")]
        public DateTime CreatedOn { get; set; }

        public IList<SelectListItem> AvailableCategories { get; set; }
    }
}

Nop.Admin\Validators\News\增加类别的验证类NewsCategoryValidator.cs，主要用于后台添加时候的非空字数限制等等，代码如下：

using FluentValidation;
using Nop.Admin.Models.News;
using Nop.Services.Localization;

namespace Nop.Admin.Validators.News
{
    public class NewsCategoryValidator : AbstractValidator<NewsCategoryModel>
    {
        public NewsCategoryValidator(ILocalizationService localizationService)
        {
            RuleFor(x => x.Name)
                .NotNull()
                .WithMessage(localizationService.GetResource("Admin.ContentManagement.News.NewsCategoryItems.Fields.Name.Required"));

            RuleFor(x => x.Description)
                .NotNull()
                .WithMessage(localizationService.GetResource("Admin.ContentManagement.News.NewsCategoryItems.Fields.Description.Required"));
        }
    }
}

修改Nop.Admin/MappingExtensions.cs文件，增加新闻类别相关内容，这几个方法主要是NewsCategory和NewsCategoryModel之间的相互转换，代码如下：

//news category items
        public static NewsCategoryModel ToModel(this NewsCategory entity)
        {
            return Mapper.Map<NewsCategory, NewsCategoryModel>(entity);
        }

        public static NewsCategory ToEntity(this NewsCategoryModel model)
        {
            return Mapper.Map<NewsCategoryModel, NewsCategory>(model);
        }

        public static NewsCategory ToEntity(this NewsCategoryModel model, NewsCategory destination)
        {
            return Mapper.Map(model, destination);
        }

修改Nop.Admin/Infrastructure/AutoMapperStartupTask.cs文件，增加相关映射规则，如果不加的话会出错的哦，
AutoMapper是基于对象到对象约定的映射工具，常用于（但并不仅限制于）把复杂的对象模型转为DTO，一般用于ViewModel模式和跨服务范畴。
AutoMapper给用户提供了便捷的配置API，就像使用约定来完成自动映射那样。
代码如下：

Mapper.CreateMap<NewsCategory, NewsCategoryModel>()
                .ForMember(dest => dest.AvailableCategories, mo => mo.Ignore())
                .ForMember(dest => dest.ParentCategoryName, mo => mo.Ignore())
                .ForMember(dest => dest.CreatedOn, mo => mo.Ignore());
            Mapper.CreateMap<NewsCategoryModel, NewsCategory>()
                .ForMember(dest => dest.CreatedOn, mo => mo.Ignore());

最后修改Nop.Admin\Controllers\NewsController.cs，增加新闻类别的增删改查操作，如下：

#region News category items
        public ActionResult CategoryList()
        {
            if (!_permissionService.Authorize(StandardPermissionProvider.ManageNews))
                return AccessDeniedView();

            var news = _newsService.GetAllNewsCategory(0, _adminAreaSettings.GridPageSize, true);
            var gridModel = new GridModel<NewsCategoryModel>
            {
                Data = news.Select(x =>
                {
                    var m = x.ToModel();
                    m.CreatedOn = _dateTimeHelper.ConvertToUserTime(x.CreatedOn, DateTimeKind.Utc);
                    m.Name = x.GetCategoryBreadCrumb(_newsService);
                    m.Published = x.Published;
                    m.DisplayOrder = x.DisplayOrder;
                    return m;
                }),
                Total = news.TotalCount
            };
            return View(gridModel);
        }

        [HttpPost, GridAction(EnableCustomBinding = true)]
        public ActionResult CategoryList(GridCommand command)
        {
            if (!_permissionService.Authorize(StandardPermissionProvider.ManageNews))
                return AccessDeniedView();

            var news = _newsService.GetAllNewsCategory(0, _adminAreaSettings.GridPageSize, true);
            var gridModel = new GridModel<NewsCategoryModel>
            {
                Data = news.Select(x =>
                {
                    var m = x.ToModel();
                    m.CreatedOn = _dateTimeHelper.ConvertToUserTime(x.CreatedOn, DateTimeKind.Utc);
                    m.Name = x.GetCategoryBreadCrumb(_newsService);
                    m.Published = x.Published;
                    m.DisplayOrder = x.DisplayOrder;
                    return m;
                }),
                Total = news.TotalCount
            };
            return new JsonResult
            {
                Data = gridModel
            };
        }

        public ActionResult CategoryCreate()
        {
            if (!_permissionService.Authorize(StandardPermissionProvider.ManageNews))
                return AccessDeniedView();

            var model = new NewsCategoryModel();
            //default values
            model.Published = true;

            //categories
            model.AvailableCategories.Add(new SelectListItem() { Text = _localizationService.GetResource("Admin.Common.All"), Value = "0" });
            foreach (var c in _newsService.GetAllNewsCategory(true))
                model.AvailableCategories.Add(new SelectListItem() { Text = c.GetCategoryNameWithPrefix(_newsService), Value = c.Id.ToString() });

            return View(model);
        }
        [HttpPost, FormValueExists("save", "save-continue", "continueEditing")]
        public ActionResult CategoryCreate(NewsCategoryModel model, bool continueEditing)
        {
            if (!_permissionService.Authorize(StandardPermissionProvider.ManageNews))
                return AccessDeniedView();

            if (ModelState.IsValid)
            {
                var newsItem = model.ToEntity();
                newsItem.CreatedOn = DateTime.UtcNow;
                newsItem.UpdatedOn = DateTime.UtcNow;
                _newsService.InsertNewsCategory(newsItem);

                SuccessNotification(_localizationService.GetResource("Admin.ContentManagement.News.NewsCategoryItems.Added"));
                return continueEditing ? RedirectToAction("CategoryEdit", new { id = newsItem.Id }) : RedirectToAction("CategoryList");
            }

            return View(model);
        }

        public ActionResult CategoryEdit(int id)
        {
            if (!_permissionService.Authorize(StandardPermissionProvider.ManageNews))
                return AccessDeniedView();

            var newsItem = _newsService.GetNewsCategoryById(id);
            if (newsItem == null)
                //No news item found with the specified id
                return RedirectToAction("CategoryList");

            var model = newsItem.ToModel();
            //categories
            model.AvailableCategories.Add(new SelectListItem() { Text = _localizationService.GetResource("Admin.Common.All"), Value = "0" });
            foreach (var c in _newsService.GetAllNewsCategory(true))
                model.AvailableCategories.Add(new SelectListItem() { Text = c.GetCategoryNameWithPrefix(_newsService), Value = c.Id.ToString() });

            return View(model);
        }

        [HttpPost, FormValueExists("save", "save-continue", "continueEditing")]
        public ActionResult CategoryEdit(NewsCategoryModel model, bool continueEditing)
        {
            if (!_permissionService.Authorize(StandardPermissionProvider.ManageNews))
                return AccessDeniedView();

            var newsItem = _newsService.GetNewsCategoryById(model.Id);
            if (newsItem == null)
                //No news item found with the specified id
                return RedirectToAction("CategoryList");

            if (ModelState.IsValid)
            {
                newsItem = model.ToEntity(newsItem);
                newsItem.UpdatedOn = DateTime.UtcNow;
                _newsService.UpdateNewsCategory(newsItem);

                SuccessNotification(_localizationService.GetResource("Admin.ContentManagement.News.NewsCategoryItems.Updated"));
                return continueEditing ? RedirectToAction("CategoryEdit", new { id = newsItem.Id }) : RedirectToAction("List");
            }

            return View(model);
        }

        [HttpPost, ActionName("DeleteCategory")]
        public ActionResult DeleteCategoryConfirmed(int id)
        {
            if (!_permissionService.Authorize(StandardPermissionProvider.ManageNews))
                return AccessDeniedView();

            var newsItem = _newsService.GetNewsCategoryById(id);
            if (newsItem == null)
                //No news item found with the specified id
                return RedirectToAction("CategoryList");

            _newsService.DeleteNewsCategory(newsItem);

            SuccessNotification(_localizationService.GetResource("Admin.ContentManagement.News.NewsCategoryItems.Deleted"));
            return RedirectToAction("CategoryList");
        }

        #endregion

6、接下来就是页面View了，代码太多，这里不再具体列出，不熟悉MVC机制的可以先补充一下MVC相关知识。
稍后整理提供下载。

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