举个栗子,获取新闻详情的案例。

public ActionResult NewsView(int newsId)
{
var news = _newsService.GetNewsById(newsId); // 获取数据
NewsModel newsItem = new NewsModel(); // 新建模型存储数据
if (null != news)
{
newsItem.Id = news.Id;
newsItem.Title = news.Title;
newsItem.Short = news.Short;
newsItem.Full = news.Full;
newsItem.AllowComments = news.AllowComments;
newsItem.CommentCount = news.CommentCount;
newsItem.PrizeCount = news.PrizeCount;
newsItem.ClickCount = news.ClickCount + 1;
newsItem.CreatedOn = news.CreatedOn.ToString("yyyy-MM-dd HH:mm:ss"); // 处理日期
newsItem.IsPrize = null != news.NewsComments.FirstOrDefault(m => m.IsPrize);
if (news.NewsPictures.Count > 0) // 处理新闻图片
{
foreach (var itemp in news.NewsPictures.OrderBy(m => m.DisplayOrder))
{
newsItem.CoverImgUrls.Add(_pictureService.GetPictureUrl(itemp.PictureId));
}
}
news.ClickCount++;
_newsService.UpdateNews(news); // 更新点击数量
}
return View(newsItem); // 将数据传入界面端
}

再谈_newsService如何获取数据。

using Nop.Core;
using Nop.Core.Data;
using Nop.Core.Domain.News;
using Nop.Services.Events;
using System;
using System.Collections.Generic;
using System.Linq; namespace Nop.Services.News
{
/// <summary>
/// News service
/// </summary>
public partial class NewsService : INewsService
{
#region Fields
private readonly IRepository<NewsItem> _newsItemRepository;
private readonly IRepository<NewsComment> _newsCommentRepository;
private readonly IRepository<NewsPicture> _newsPictureRepository;
private readonly IEventPublisher _eventPublisher; #endregion #region Ctor public NewsService(IRepository<NewsItem> newsItemRepository,
IRepository<NewsComment> newsCommentRepository,
IRepository<NewsPicture> newsPictureRepository,
IEventPublisher eventPublisher)
{
this._newsItemRepository = newsItemRepository;
this._newsCommentRepository = newsCommentRepository;
this._newsPictureRepository = newsPictureRepository;
this._eventPublisher = eventPublisher;
} #endregion #region Methods /// <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); //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; return _newsItemRepository.GetById(newsId);
} /// <summary>
/// Gets all news
/// </summary>
/// <param name="languageId">Language identifier; 0 if you want to get all records</param>
/// <param name="storeId">Store identifier; 0 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 = 0, int storeId = 0,
int pageIndex = 0, int pageSize = int.MaxValue, bool showHidden = false)
{
var query = _newsItemRepository.Table;
if (!showHidden)
{
query = query.Where(n => n.Published);
}
query = query.OrderByDescending(n => n.CreatedOn); 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); //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); //event notification
_eventPublisher.EntityUpdated(news);
} /// <summary>
/// Gets news
/// </summary>
/// <param name="newsIds">The news identifiers</param>
/// <returns>News</returns>
public virtual IList<NewsItem> GetNewsByIds(int[] newsIds)
{
var query = _newsItemRepository.Table;
return query.Where(p => newsIds.Contains(p.Id)).ToList();
} /// <summary>
/// Gets all comments
/// </summary>
/// <param name="customerId">Customer identifier; 0 to load all records</param>
/// <returns>Comments</returns>
public virtual IList<NewsComment> GetAllComments(int customerId)
{
var query = from c in _newsCommentRepository.Table
orderby c.CreatedOn
where (customerId == 0 || c.CustomerId == customerId)
select c;
var content = query.ToList();
return content;
} /// <summary>
/// Gets a news comment
/// </summary>
/// <param name="newsCommentId">News comment identifier</param>
/// <returns>News comment</returns>
public virtual NewsComment GetNewsCommentById(int newsCommentId)
{
if (newsCommentId == 0)
return null; return _newsCommentRepository.GetById(newsCommentId);
} /// <summary>
/// Get news comments by identifiers
/// </summary>
/// <param name="commentIds">News comment identifiers</param>
/// <returns>News comments</returns>
public virtual IList<NewsComment> GetNewsCommentsByIds(int[] commentIds)
{
if (commentIds == null || commentIds.Length == 0)
return new List<NewsComment>(); var query = from nc in _newsCommentRepository.Table
where commentIds.Contains(nc.Id)
select nc;
var comments = query.ToList();
//sort by passed identifiers
var sortedComments = new List<NewsComment>();
foreach (int id in commentIds)
{
var comment = comments.Find(x => x.Id == id);
if (comment != null)
sortedComments.Add(comment);
}
return sortedComments;
} /// <summary>
/// Deletes a news comments
/// </summary>
/// <param name="newsComments">News comments</param>
public virtual void DeleteNewsComments(IList<NewsComment> newsComments)
{
if (newsComments == null)
throw new ArgumentNullException("newsComments"); _newsCommentRepository.Delete(newsComments);
}
/// <summary>
/// 更新新闻评论
/// </summary>
/// <param name="newsComment"></param>
public virtual void UpdateNewsComment(NewsComment newsComment)
{
if (newsComment == null)
throw new ArgumentNullException("newsComment"); _newsCommentRepository.Update(newsComment); //event notification
_eventPublisher.EntityUpdated(newsComment);
}
/// <summary>
/// Deletes a news comment
/// </summary>
/// <param name="newsComment">News comment</param>
public virtual void DeleteNewsComment(NewsComment newsComment)
{
if (newsComment == null)
throw new ArgumentNullException("newsComment"); _newsCommentRepository.Delete(newsComment);
}
public virtual IList<NewsItem> GetNewsByCategoryId(int categoryId, int pageSize = 4)
{
var query = (from x in _newsItemRepository.Table
where x.NewsCategoryId == categoryId
&& x.Published
orderby x.CreatedOn descending
select x).Take(pageSize).ToList();
return query;
}
public virtual PagedList<NewsComment> GetNewsCommentsByNewsId(int newsId, int pageIndex = 1, int pageSize = 5)
{
var query = from x in _newsCommentRepository.Table
where x.NewsItemId == newsId
&& !x.IsScreen
&& !x.IsPrize
orderby x.CreatedOn descending
select x;
return new PagedList<NewsComment>(query, pageIndex - 1, pageSize);
}
public virtual void ChangePrize(int newsId, int customerId, bool isPrize = true)
{
var news = GetNewsById(newsId);
if (null != news)
{
var comments = (from x in news.NewsComments
where x.NewsItemId == newsId
&& x.CustomerId == customerId
&& x.IsPrize
orderby x.CreatedOn descending
select x).FirstOrDefault();
if (isPrize)
{
if (null == comments)
{
news.NewsComments.Add(new NewsComment
{
NewsItemId = newsId,
CustomerId = customerId,
CreatedOn = DateTime.Now,
IsPrize = true
});
news.PrizeCount++;
}
}
else
{
if (null != comments)
{
//news.NewsComments.Remove(comments);
DeleteNewsComment(comments);
news.PrizeCount--;
}
}
UpdateNews(news);
}
}
public virtual bool AddNewsComment(int newsId, int customerId, string text, out string msg)
{
bool result = false;
var news = GetNewsById(newsId);
if (null != news)
{
var comments = (from x in news.NewsComments
where x.CustomerId == customerId
&& !x.IsPrize
orderby x.CreatedOn descending
select x).FirstOrDefault();
if (null != comments && comments.CreatedOn > DateTime.Now.AddMinutes(-1))
msg = "评论过于频繁";
else
{
news.NewsComments.Add(new NewsComment
{
NewsItemId = newsId,
CustomerId = customerId,
CommentText = text,
CreatedOn = DateTime.Now,
IsPrize = false,
IsScreen=true
});
msg = "评论成功,等待审核";
result = true;
news.CommentCount++;
UpdateNews(news);
}
}
else
{
msg = "新闻不存在";
result = false;
}
return result;
} /// <summary>
/// 搜索所有的新闻
/// </summary>
/// <param name="dateFrom"></param>
/// <param name="dateTo"></param>
/// <param name="pageIndex"></param>
/// <param name="pageSize"></param>
/// <param name="showHidden"></param>
/// <returns></returns>
public virtual IPagedList<NewsItem> GetAllNews(DateTime? dateFrom = null, DateTime? dateTo = null,
int pageIndex = 0, int pageSize = int.MaxValue, bool showHidden = false)
{
var query = _newsItemRepository.Table;
if (dateFrom.HasValue)
query = query.Where(c => dateFrom.Value <= c.CreatedOn);
if (dateTo.HasValue)
query = query.Where(c => dateTo.Value >= c.CreatedOn);
if (!showHidden)
{
query = query.Where(n => n.Published);
}
query = query.OrderByDescending(n => n.CreatedOn); var news = new PagedList<NewsItem>(query, pageIndex, pageSize);
return news;
} /// <summary>
/// 搜索所有的新闻评论
/// </summary>
/// <param name="dateFrom"></param>
/// <param name="dateTo"></param>
/// <param name="pageIndex"></param>
/// <param name="pageSize"></param>
/// <param name="showHidden"></param>
/// <returns></returns>
public virtual IPagedList<NewsComment> GetAllComments(string commentContent=null,int pageIndex = 0, int pageSize = int.MaxValue)
{
var query = from c in _newsCommentRepository.Table
where (!string.IsNullOrEmpty(commentContent)&&c.CommentText.Contains(commentContent.Trim()))||(string.IsNullOrEmpty(commentContent))
orderby c.Id descending
select c; //if (!showHidden)
//{
// query = query.Where(n => n.Published);
//}
return new PagedList<NewsComment>(query, pageIndex, pageSize);
} #region News pictures /// <summary>
/// Deletes a news picture
/// </summary>
/// <param name="newsPicture">News picture</param>
public virtual void DeleteNewsPicture(NewsPicture newsPicture)
{
if (newsPicture == null)
throw new ArgumentNullException("newsPicture"); _newsPictureRepository.Delete(newsPicture); //event notification
_eventPublisher.EntityDeleted(newsPicture);
} /// <summary>
/// Gets a news pictures by newsItem identifier
/// </summary>
/// <param name="newsItemId">The news identifier</param>
/// <returns>News pictures</returns>
public virtual IList<NewsPicture> GetNewsPicturesByNewsItemId(int newsItemId)
{
var query = from np in _newsPictureRepository.Table
where np.NewsItemId == newsItemId
orderby np.DisplayOrder
select np;
var newsItemPictures = query.ToList();
return newsItemPictures;
} /// <summary>
/// Gets a newsItem picture
/// </summary>
/// <param name="newsItemIdPictureId">News picture identifier</param>
/// <returns>News picture</returns>
public virtual NewsPicture GetNewsPictureById(int newsPictureId)
{
if (newsPictureId == 0)
return null; return _newsPictureRepository.GetById(newsPictureId);
} /// <summary>
/// Inserts a newsItem picture
/// </summary>
/// <param name="newsPicture">News picture</param>
public virtual void InsertNewsPicture(NewsPicture newsPicture)
{
if (newsPicture == null)
throw new ArgumentNullException("newsPicture"); _newsPictureRepository.Insert(newsPicture); //event notification
_eventPublisher.EntityInserted(newsPicture);
} /// <summary>
/// Updates a newsItem picture
/// </summary>
/// <param name="newsPicture">News picture</param>
public virtual void UpdateNewsPicture(NewsPicture newsPicture)
{
if (newsPicture == null)
throw new ArgumentNullException("newsPicture"); _newsPictureRepository.Update(newsPicture); //event notification
_eventPublisher.EntityUpdated(newsPicture);
} /// <summary>
/// Get the IDs of all newsItem images
/// </summary>
/// <param name="NewsItemIds">News IDs</param>
/// <returns>All picture identifiers grouped by newsItem ID</returns>
public IDictionary<int, int[]> GetNewsItemsImagesIds(int[] newsItemsIds)
{
return _newsPictureRepository.Table.Where(p => newsItemsIds.Contains(p.NewsItemId))
.GroupBy(p => p.NewsItemId).ToDictionary(p => p.Key, p => p.Select(p1 => p1.PictureId).ToArray());
} #endregion #endregion
}
}

这上面都是自己写的一些常用的数据库交互方法。

系统最核心的还是它! ##IRepository

using System.Collections.Generic;
using System.Linq; namespace Nop.Core.Data
{
/// <summary>
/// Repository
/// </summary>
public partial interface IRepository<T> where T : BaseEntity
{
/// <summary>
/// Get entity by identifier
/// </summary>
/// <param name="id">Identifier</param>
/// <returns>Entity</returns>
T GetById(object id); /// <summary>
/// Insert entity
/// </summary>
/// <param name="entity">Entity</param>
void Insert(T entity); /// <summary>
/// Insert entities
/// </summary>
/// <param name="entities">Entities</param>
void Insert(IEnumerable<T> entities); /// <summary>
/// Update entity
/// </summary>
/// <param name="entity">Entity</param>
void Update(T entity); /// <summary>
/// Update entities
/// </summary>
/// <param name="entities">Entities</param>
void Update(IEnumerable<T> entities); /// <summary>
/// Delete entity
/// </summary>
/// <param name="entity">Entity</param>
void Delete(T entity); /// <summary>
/// Delete entities
/// </summary>
/// <param name="entities">Entities</param>
void Delete(IEnumerable<T> entities); /// <summary>
/// Gets a table
/// </summary>
IQueryable<T> Table { get; } /// <summary>
/// Gets a table with "no tracking" enabled (EF feature) Use it only when you load record(s) only for read-only operations
/// </summary>
IQueryable<T> TableNoTracking { get; }
}
}

为了处理,获取的数据,还需要定义个常用的Model模型来存储数据,这个真心的蛋疼。

using Nop.Web.Framework.Mvc;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web; namespace Nop.Web.Models.News
{
public partial class AppNewsModel
{
public AppNewsModel()
{
this.News = new List<NewsModel>();
}
public bool result { get; set; }
public string msg { get; set; }
public List<NewsModel> News { get; set; }
}
/// <summary>
/// 新闻
/// </summary>
public partial class NewsModel : BaseNopEntityModel
{
public NewsModel()
{
this.CoverImgUrls = new List<string>();
}
/// <summary>
/// 标题
/// </summary>
public string Title { get; set; }
/// <summary>
/// 概要
/// </summary>
public string Short { get; set; }
/// <summary>
/// 详情(新闻列表不传该字段)
/// </summary>
public string Full { get; set; }
/// <summary>
/// 允许评论
/// </summary>
public bool AllowComments { get; set; }
/// <summary>
/// 评论量
/// </summary>
public int CommentCount { get; set; }
/// <summary>
/// 点赞量
/// </summary>
public int PrizeCount { get; set; }
/// <summary>
/// 创建时间
/// </summary>
public string CreatedOn { get; set; }
/// <summary>
/// 赞
/// </summary>
public bool IsPrize { get; set; }
/// <summary>
/// 点击数量
/// </summary>
public int ClickCount { get; set; }
public List<string> CoverImgUrls { get; set; }
}
}

基本上,还是很清晰的。就跟王者荣耀游戏一样,玩几局,就摸透了。

F12定位恒好用。

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