[转]教你一招 - 如何给nopcommerce增加新闻类别模块

本文转自：http://www.nopchina.net/post/nopchina-teach-newscategory.html

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：

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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：

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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：

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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：

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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：

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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：

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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：

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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：

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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：

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//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：

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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：

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#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。