mysql - Entity Framework Reverse Engineer Code First 可以和 MySql 一起使用吗？

Question

我在 Win 7 Ultimate SP1 和 EF Power Tools 上使用 MS Visual Studio 2012 Update 1 .

我正在尝试在 MySql 数据库上使用 Entity Framework 的逆向工程代码优先功能。我可以成功连接到数据库，但是当它尝试完成代码生成时，出现以下错误:

System.NullReferenceException: Object reference not set to an instance of an object.
   at Microsoft.DbContextPackage.Extensions.ProjectExtensions.InstallPackage(Project project, String packageId)
   at Microsoft.DbContextPackage.Handlers.ReverseEngineerCodeFirstHandler.ReverseEngineerCodeFirst(Project project)

One or more errors occurred while processing template 'Entity.tt'.
C:\Program Files (x86)\Microsoft Visual Studio 11.0\Common7\IDE\Extensions\Microsoft\Entity Framework Tools\Templates\Includes\EF.Utility.CS.ttinclude(1,4) : error : A processor named 'T4VSHost' could not be found for the directive named 'CleanupBehavior'. The transformation will not be run.  The following Exception was thrown:
System.InvalidOperationException: Cannot find processor for directive 'T4VSHost'.
   at Microsoft.DbContextPackage.Utilities.EfTextTemplateHost.Microsoft.VisualStudio.TextTemplating.ITextTemplatingEngineHost.ResolveDirectiveProcessor(String processorName)
   at Microsoft.VisualStudio.TextTemplating.Engine.ProcessCustomDirectives(ITextTemplatingEngineHost host, TemplateProcessingSession session, IEnumerable`1 directivesToBeProcessed)

我无法使用我的 google foo 找到任何信息。

Answer 1

目前这是 Entity Framework 的一个活跃错误。 bug详情可见here .

目前有 2 种解决方法，下面是我使用的一种。

打开 C# 文件:

C:\Program Files (x86)\Microsoft Visual Studio 11.0\Common7\IDE\Extensions\Microsoft\Entity Framework Tools\Templates\Includes\EF.Utility.CS.ttinclude

或对于 VB.net:

C:\Program Files (x86)\Microsoft Visual Studio 11.0\Common7\IDE\Extensions\Microsoft\Entity Framework Tools\Templates\Includes\EF.Utility.VB.ttinclude

并删除第一行:

<#@ CleanupBehavior Processor="T4VSHost" CleanupAfterProcessingTemplate="true" #>