这是对的重申,“https://stackoverflow.com/uss/348971/meetjaydeep>>meetjaydeep s 回答。他和dpblog ,我从那里得到了大部分信息。

安装所描述的这里。

Installing EF 4.3.1
Please note that before you do the upgrade, this will temporarily break your code. So I suggest doing a backup before proceeding.

1. Install NuGet if it is not installed already.
2. Open the NuGet Package Manager Console (VS2010 Menu Bar > Tools > Library Package Manager)
3. After it finishes loading execute this command, make sure to select the correct project from the drop down before hitting enter: Install-Package EntityFramework -Version 4.3.1

EF4.0至EF 4.3.1的升级,如“a href='http://blogs.msdn.com/b/adonet/archive/2011/09/28/ef-4-2-model-amp-database-first-walktrough.aspx” rel=“nofollow noreferrer'>这里(我将跳到第4步)。

Upgrading from EF 4.0 to EF 4.3.1
A word of caution - just because you installed EF 4.3.1, definitely does not mean you are finished. What you just did is just give yourself the option to use new templates (from what I have seen after doing this myself). Now is it is time to use those new templates.

1. Open up your EDMX design view.
2. On the design surface; Right Click > Add Code Generation Item
3. Select "Online Templates" from the left menu
4. Search for "DbContext"
5. Select "EF 4.x DbContext Generator" from the list
6. Name this item differently from your EDMX s name. "_____Model.tt" (fill in the blank). I used ___DBCModel.tt - Example: FooDBCModel.tt
7. Click ‘Add’
8. Verify that two files have been created: FooDBCModel.tt and FooDBCModel.Context.tt for example.

Fixing Your Now Slightly Broken Code
Your code won t compile now - don t despair - that s because what you just did is swap out System.Data.Objects.ObjectContext for the new and improved (well for me anyhow) System.Data.Entity.DbContext (Yaaaaay...)

• You need to update all of your CUD (Create, Update, Delete) methods.
• Instead of using context.AddToEntityNameHere(...) use context.EntityNameHere.Add(...)
• Example: context.AddToProducts(product) > context.Products.Add(product)
• You now have access to the Database property
• You now have access to the Entry(...) method.
• You can now explicitly state which properties to update during an update (context.SaveChanges()). Interested? Look here.

在我看来,这完全值得做额外的工作。 EF4.0对于它来说是太有限了。 EF 4.3.1 比较灵活,我喜欢所提供的综合食糖。 我确信,5.0 EF甚至更好,但我现在无法跳跃。

玩得开心点

要使 EF4.3.1 具有可评价性,您应该首先安装 EF4.1 更新1, 并使用最新的 NuGet 。

EF4.0是第一个或第一个模式的数据库,如果你想升级为EF4.3,最简单的方式是使用“代码生成器”:http://blogs.msdn.com/b/adonet/archive/2011/09/28/ef-4-mode-amp-database-patbase-first-walkentrough.aspx 。