关于chrome-devtools:分层架构ContextPerRequest

通过组织Repository，咱们能够让多个Repository共用同一个DbContext。其实咱们还能够更进一步：

让每一次Http申请都应用而且只应用同一个DbContext —— 这就是 Context Per Request 模式。

ConnectionPerRequest

出现一个残缺的页面，可能会有很屡次的数据库操作。以“内容列表页”为例，想一想：

• 导航栏LogonStatus：查找以后用户+更新帮帮豆（可能）
• 列表：取得当前页的Problem
• 分页：取得Problem总数
• 右侧widget：……

每一次查找，都要应用一次数据库链接，耗费性能。能不能每一个Request申请，都只应用一个数据库链接？在承受到HTTP申请时关上连贯，在HTTP申请完结时敞开连贯？

OK，ASP.NET为咱们提供这种机制：Filter。

学习Filter首先要理解一个

带来的益处

进步性能

缩小了DbContext的生成：以前一次Http申请，可能须要new好几个DbContext的，当初一次就OK了。

当然，这样每一个DbConext占用的工夫会更长，好在Web我的项目中每一次Http申请耗费的工夫都不会太长，所以通常这都不是一个问题。

在Request层面实现 Unit of Work

简直所有的Http申请，人造要求“事务”属性。比方用户在文章发布页面点击公布按钮，当然是心愿和文章公布相干的所有业务逻辑（比方扣帮帮币加帮帮点生成音讯等等）都实现，不可能文章公布失败但帮帮币给扣掉了啥的……  Context Per Request 就可能：

1. 在Context生成的时候，启动事务
2. 在Request完结的时候，提交/回滚事务

@想一想@：如果一个HttpRequest只是进行查问，放到事务外面会影响性能么？

SELECT *

BEGIN TRAN
SELECT * COMMIT

是一样的么？

HttpContext容器

第一个要解决的问题：每一次用到的DbContext，寄存在哪里？

ASP.NET为咱们提供了一个Dictionary容器：HttpContext.Current.Items，它寄存在以后Http申请的上下文环境中，即：如果Http申请完结，Items也隐没；一个Http申请一个Items——这是一个绝佳的寄存DbContext的容器。

存入/读取

为了便于所有Service获取DbContext实例，咱们在BaseService中增加一个dbContext只读属性：

protected SqlContext dbContext { get {

而后，用咱们曾经十分相熟的形式解决：

string contextKey = "dbContext"; //尝试从HttpContext.Current.Items中获取DbContext SqlContext context = HttpContext.Current.Items[contextKey] as SqlContext; //获取不到就生成一个 if (context == null) { context = new SqlContext(); //不要忘了启动事务 context.Database.BeginTransaction(); //将DbContext存入Items以便下次应用 HttpContext.Current.Items[contextKey] = context; }//else nothing return context;

这样就能保障一个Http申请中，通过dbContext始终只能取得一个SqlContext实例。比方ArticleService：

public class ArticleService : BaseService, IArticleService { private ArticleRepository _repository; public ArticleService() { _repository = new ArticleRepository(dbContext); }

ActionFilter

在什么时候，通过什么形式同步DbContext中的变动（提交事务）呢？一个不便的方法是利用ActionFilter（也能够是IActionFilter）。

因为咱们应用的是独立的ViewModel，所以一旦Action执行实现，就实现了ViewModel的全副付诸，不再须要DbContext了，所以能够

新建一个Filter：

public class ContextPerRequest : ActionFilterAttribute

而后override OnActionExecuted()，在这外面实现事务提交/回滚

public override void OnActionExecuted(ActionExecutedContext filterContext)

接着，能够把 ContextPerRequest 搁置在BaseController上，以确保所有Controller都被笼罩：

[ContextPerRequest] public class BaseController : Controller

Filter中的AutoFac

为了关照MockService，Filter中不能间接new XService()，须要通过AutoFac解析Service实例。怎么办呢？非常简单：

首先，在Golbal.asax.cs中增加：

builder.RegisterFilterProvider();

而后，间接在Filter中申明一个Service属性：

public IBaseService Service { get; set; }

接下来就能够间接用这个Service了。

演示：Sevice对象按AutoFac配置实例化

ChildAction

首先，须要留神如果是ChildAction，不应该进行提交/回滚：

if (!filterContext.IsChildAction) { if (filterContext.Exception == null)//.... }//else nothing

Commit还是Rollback？

接着，利用filterContext的Exception属性：

if (!filterContext.IsChildAction) { if (filterContext.Exception == null) { Service.Commit(); } else { Service.Rollback(); } }

因为：

• 在Filter运行之前，所以的未解决的异样，都能够从filterContext.Exception中获取；
• 如果没有任何异样，filterContext.Exception就为null值。

而且，无论是否报异样，都不影响ActionFilter的执行。_（演示）_

BaseService

须要小心解决两个问题：

1. null值查看
2. 资源销毁

Commit()办法

首先能够形象出一个公有办法：

/// <summary> /// 从HttpContext中取以后SqlContext /// </summary> /// <returns>取不到就是null值</returns> private SqlContext getContextFromHttp() //办法名要长！区别于dbContext { return HttpContext.Current.Items["dbContext"] as SqlContext; }

该办法还可供dbContext/Rollback()等重用。

而后尽量应用using包裹context和transaction，确保他们都能被开释：

using (SqlContext context = getContextFromHttp()) { if (context != null) /context可能为null/ { using (DbContextTransaction transaction = context.Database.CurrentTransaction) { //确保context没有未提交的更改 context.SaveChanges(); //不须要判断transaction是否为null //如果transaction是null就应该报异样 transaction.Commit(); //不须要rollback： //是SaveChanges()是一个隐式事务，失败都会主动回滚 //transaction在using中，如果失败，Dipsose()时也会回滚， } } //没有context就不须要解决 }

对其余办法的影响

留神咱们在Commit()时调用了context.SaveChanges()，所以咱们_能够_缩小其余中央SaveChanges()的调用，比方：

public void AddRange(IEnumerable<T> articles) { entities.AddRange(articles); //sqlContext.SaveChanges(); }

曾经entity状态的变动，比方：

User author = repository.Find(authorId); Article article = new Article { Author = author }; //repository().SaveChanges();

然而，有些中央调用SaveChanges()还是必须的，比方新建一个对象之后，要获取它的Id：

public int Add(T entity) { entities.Add(entity); SaveChanges(); //不SaveChanges()，Id只能是O return entity.Id; }

Rollback()办法

大体和Commit()相似，但更简略：

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