实体框架中的'ObjectContext'与'DbContext'

I'm using the DbContext class within code that I am creating that is based on the Generic Repositories and Unit of Work design patterns. (I am following the guidance here.) While working on this project I have encountered the ObjectContext class.

我正在使用基于Generic Repositories和Unit of Work设计模式创建的代码中的DbContext类。 (我在这里遵循指导。)在处理这个项目时,我遇到了ObjectContext类。

I've read quite a number of posts that discuss ObjectContext vs. DbContext. While some of what I've read makes sense, I still don't have a complete understanding of the differences and this leaves me wondering about my current implementation. Should I be using DbContext, ObjectContext or both? Is using one of these now considered an anti-pattern?

我已经阅读了很多讨论ObjectContext与DbContext的帖子。虽然我读过的一些内容是有道理的,但我仍然没有完全理解这些差异,这使我对我当前的实现感到疑惑。我应该使用DbContext,ObjectContext还是两者?使用其中一个现在被认为是反模式?

3 个解决方案

#1

DbContext is just a wrapper around ObjectContext.

DbContext只是ObjectContext的包装器。

DbContext is just a set of APIs that are easier to use than the APIs exposed by ObjectContext.

DbContext只是一组比ObjectContext公开的API更容易使用的API。

Anyway, here you'll find a very simple Visual Studio template that uses the Repository Pattern and the Entity Framework.

无论如何,在这里,您将找到一个使用存储库模式和实体框架的非常简单的Visual Studio模板。

#2

-1

We can cast a DBContext to type ObjectContext

我们可以转换DBContext来键入ObjectContext

public class MyContext: DbContext
{
    public DbSet<Blog> Blogs { get; set; }
   //other dbsets, ctor etc.

    public ObjectContext ObjectContext()
    {
        return (this as IObjectContextAdapter).ObjectContext;
    }
}

#3

-1

From ObjectContext VS DBContext.

来自ObjectContext VS DBContext。

Dbcontext can be defined as a lightweight version of the ObjectContext or we can say Dbcontext is a wrapper of ObjectContext and exposes only the common features that are really required in programming. We can also get a reference to the ObjectContext from then DbContext to use those features that are only supported in ObjectContext.

Dbcontext可以定义为ObjectContext的轻量级版本,或者我们可以说Dbcontext是ObjectContext的包装器,并且只公开编程中真正需要的常用功能。我们还可以从DbContext获取对ObjectContext的引用,以使用仅在ObjectContext中支持的那些功能。

The following code could help to get an ObjectContext Object from an existing DbContext Object.

以下代码可以帮助从现有的DbContext对象获取ObjectContext对象。

public class EntityDBContext: DbContext, IObjectContextAdapter
{
   ObjectContext IObjectContextAdapter.ObjectContext
   {
        get
        {
              var objectContext = (this as IObjectContextAdapter)
              if(objectContext != null)
                return (this as IObjectContextAdapter).ObjectContext;
              else
                return null;
        }
   }
}

Finally, DbContext is not a replacement of ObjectContext, but it is a simple alternative that builds on ObjectContext.

最后,DbContext不是ObjectContext的替代品,但它是构建在ObjectContext上的简单替代方案。

#1