[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。