如何从实体数据模型（edmx）生成数据上下文类？

Question

This is my first time to use Entity Data Model as data access layer.

From some example codes, I see people have data context class that inherit from DbContext

[file name: FooEntities.Context.tt]
public partial class FooEntities : DbContext
{
    // ...
}

when I try to Add Code Generation Item from entity data model (edmx) , I always have data context class that inherit from ObjectContext

[file name: FooEntities.Context.tt]
public partial class FooEntities : ObjectContext
{
    // ...
}

So, how do we generate data context files that inherits from DbContext ?

Answer 1

The DbContext is part of the EF 4.1, unless you are using this specific version or upper (not yet) you will not have this class.

More info here