Entity FrameWork 365-day series Source code research (1)

By Kmsfan-this series of articles only as their own reading notes, not included in the blog home page.

Summary of Knowledge points:

1.DBContext class

Properties in 2.Attribute (Notnull)

3.DbContext implementation of 2 interfaces: 1.IDisposeable 2.IDbContextService

Namespace Microsoft.Data.Entity.Commands

Let's take a look at something under this namespace, there's a Contexttool method

There is a Createcontext method inside.

Due to my own interest in dbcontext comparison, so I could not help but pressed the next F12, so I saw the following structure:

where DbContext implemented 2 interfaces, one is IDisposable, the other is idbcontextservices, I think, since the implementation of these 2 interfaces, then certainly implemented the 2 interface in the method it?!

Heart than action, hurriedly see what is inside.

IDisposable:

namespace system{////    Abstract:/    /     defines a method for releasing allocated resources. Public    Interface IDisposable    {////        Summary:        //     perform application-defined tasks related to releasing or resetting unmanaged resources.        void Dispose ();}    }

Idbcontextservice

Using System;namespace microsoft.data.entity.infrastructure{public    interface idbcontextservices    {        IServiceProvider scopedserviceprovider {get;}}    }

Because I use VS2015, hey, new features, tell everyone a small secret, you can see where the reference to this interface oh.

So you can see the importance of this interface?! There are a lot of these things in EF, and that's probably where EF is really powerful. Let's go back to createcontext this way, there is a thing called attribute, I here is not NULL, is not empty.

　　

That is, the parameters passed in are not empty (formal parameters). Let's take a look at this not null what is the divine?!

   Internal sealed class Notnullattribute:attribute    {    }

Did you see that? It's actually a closed inner class, and there's nothing in it. Online I did not find the answer, in the end, omnipotent Google has a solution, hey. I will not translate, and later to translate.

Http://stackoverflow.com/questions/4619185/what-is-an-internal-sealed-class-in-c

Well, we'll be here today, and we'll continue to summarize tomorrow.

Entity FrameWork 365-day series Source code research (1)