什么叫实体的设定者？ [英] What calls the setters in an Entity?

问题描述

在实体框架中，您必须创建一个派生自 DbContext 与IDbSet属性的类。实体框架中的什么调用setter，这是如何工作的？

In Entity Framework, you must create a class that derives from DbContext with IDbSet properties. What in Entity Framework calls the setters and how does this work?

推荐答案

当您的自定义上下文类被实例化时， c $ c> DbContext 构造函数调用私有方法调用 InitializeLazyInternalContext ，这又调用另一个私有方法调用 DiscoverAndInitializeSets 。

When your custom context class is instantiated, the base DbContext constructor calls a private method called InitializeLazyInternalContext which in turn calls another private method called DiscoverAndInitializeSets.

此方法创建一个 DbSetDiscoveryService 的新实例，将当前上下文作为构造函数参数，然后调用其 InitializeSets 方法。该方法又调用 GetSets ，它使用反射来获取派生上下文中可从 DbSet< T> （这包括 IDbSet< T> ）

This method creates a new instance of a DbSetDiscoveryService, passing in the current context as a constructor parameter, and then calls its InitializeSets method. This method in turn calls GetSets which uses reflection to get a list of any property on the derived context that is assignable from DbSet<T> (this includes IDbSet<T>).

然后它循环遍历此集合并提供属性没有标记一个 SuppressDbSetInitializationAttribute ，它通过调用DbContext的 DbSet< T> code>设置< TEntity> 方法并分配结果。

It then loops through this collection and providing the property isn't marked with a SuppressDbSetInitializationAttribute, it assigns an instance of a DbSet<T> by invoking the DbContext's Set<TEntity> method and assigning the result.

您可以查看 DbSetDiscoveryService 代码 here 。

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