EF 6中缺少QueryableExtensions

本文介绍了EF 6中缺少QueryableExtensions的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我无法调用新的 QueryableExtensions （ ToListAsync ， ForEachAsync ，...）与EntityFramework 6一起提供。但是我可以调用其他对象（包括，相交）

I can't call the new QueryableExtensions (ToListAsync, ForEachAsync,...) provided with EntityFramework 6. But i can call others (Include, Intersect).

我引用了 System.Data.Entity 。 因此，显然，我有一个 System.Data.Entity 的旧版本，以及最新版本的EntityFramework。

I've a reference to System.Data.Entity. So apparently, i've an older version of System.Data.Entity, with the latest version of EntityFramework. Is it possible?

我的代码无法编译，并且在对象浏览器中看不到 ForEachAsync 方法。

My code does not compile and I cannot see the ForEachAsync method in the object browser.

我正在使用Visual Studio 2013，.Net 4.5，EntityFramework 6.1.3，Wpf。

I'm working with Visual Studio 2013, .Net 4.5, EntityFramework 6.1.3, Wpf.

编辑

已安装实体框架：

Entity framework is installed :

我已尝试多次卸载然后重新安装软件包，并重新启动Visual Studio。仍然不起作用

I've tried to Uninstall then Reinstall package many times, with a restart of visual studio. Still not working

编辑

在另一个项目中（此项目引用） ，我可以在对象浏览器中看到 IQueryableExtensions 。如果我将此项目添加到解决方案中（之前只是参考），则对象浏览器中缺少所需的 IQueryableExtensions 。

In another project (referenced by this one), I can see the IQueryableExtensions needed in the object browser. If I add this project to my solution (before it was only a reference), the IQueryableExtensions needed are missing in the object browser.

推荐答案

您的一个项目可能针对的是框架的较早版本。

One of your projects is probably targeting an older version of the framework.

我遇到了这个问题当项目的目标是.Net v4.0时，请将其更新为4.5或更高版本。 之后，我还运行了其他人推荐的命令。

I had this issue when a project was targeting .Net v4.0, update it to 4.5 or newer. I also ran the command that others recommended after this.

update-package -reinstall EntityFramework

在程序包控制台中运行update-package命令时，可以看到.Net的目标版本。例如，我的项目定位到4.0时的输出

You can see what version of .Net is is targeting when you run the update-package command in the package console. For example output from my project when it was targeting 4.0

PM> Update-Package –reinstall EntityFramework Attempting to gather dependencies information for multiple packages with respect to project '[My project]', targeting '.NETFramework,Version=v4.0'

，然后使用v4.5.2：

and then with v4.5.2:

PM> Update-Package –reinstall EntityFramework Attempting to gather dependencies information for multiple packages with respect to project '[My Project]', targeting '.NETFramework,Version=v4.5.2'

您通过以下方式更新版本：

You update your version by:

right clicking on the project in the solution explorer, choosing "Properties" on the Application Tab (default) from the DropDown list labeled "Target Framework" select 4.5 (or greater - I chose 4.5.2)

有可能您不需要重新安装软件包，但是我在检查是否重新安装之前它起作用了。

There is a chance you don't need to reinstall the package, however I reinstalled before checking if it worked.