VS 2015 ASP.NET Web API（EF6）& Xamarin启用迁移失败 [英] VS 2015 ASP.NET Web API (EF6) & Xamarin Enable-Migrations fails

问题描述

我正在开发一个将使用ASP.NET Web API作为数据服务的项目，以及一个Xamarin便携式应用程序作为客户端。

我正在尝试启用在Web应用程序中的迁移，但是我收到以下错误：

 启用迁移--enable自动迁移-ContextTypeName MyProject.Models.ApplicationDbContext -ProjectName MyProject -StartupProjectName MyProject.App -Verbose 
使用StartUp项目'MyProject.App'。 
异常使用2参数调用SetData：在程序集
'Microsoft.VisualStudio.ProjectSystem中键入'Microsoft.VisualStudio.ProjectSystem.VS.Implementation.Package.Automation.OAProject'。 VS.Implementation，Version = 14.1.0.0，Culture = neutral，PublicKeyToken = b03f5f7f11d50a3a'未标记为可序列化。 
在C：\Users\weitz\.nuget\packages\EntityFramework\6.1.3\tools\EntityFramework.psm1：718 char：5 
 + $ domain.SetData （'项目'，$项目）
 + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ b $ b + CategoryInfo：NotSpecified：（:) []，MethodInvocationException 
 + FullyQualifiedErrorId：SerializationException 
 
使用2参数调用SetData异常：键入Microsoft。 VisualStudio.ProjectSystem.VS.Implementation.Package.Automation.OAProject'in assembly 
'Microsoft.VisualStudio.ProjectSystem.VS.Implementation，Version = 14.1.0.0，Culture = neutral，PublicKeyToken = b03f5f7f11d50a3a'未标记为可序列化。 
在C：\Users\weitz\.nuget\packages\EntityFramework\6.1.3\tools\EntityFramework.psm1：719 char：5 
 + $ domain.SetData （'contextProject'，$ contextProject）
 + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~ 
 + CategoryInfo：NotSpecified：（:) []，MethodInvocationException 
 + FullyQualifiedErrorId：SerializationException 
 
 System.NullReferenceException：Object引用未设置为对象的实例。 
在System.Data.Entity.Migrations.Extensions.ProjectExtensions.GetPropertyValue [T]（项目项目，String propertyName）
在System.Data.Entity.Migrations.MigrationsDomainCommand.GetFacade（String configurationTypeName，Boolean useContextWorkingDirectory ）
在System.Data.Entity.Migrations.EnableMigrationsCommand.FindContextToEnable（String contextTypeName）
在System.Data.Entity.Migrations.EnableMigrationsCommand。  c__DisplayClass2。< .ctor> b__0（） 
在System.Data.Entity.Migrations.MigrationsDomainCommand.Execute（Action命令）
对象引用未设置为对象的实例。 
 ** PM> ** 
  

正如你所看到的，我试过指定明确启动项目，但看起来不像enable-migrations命令那么高兴。

这是一个使用完整的.NET（I' m绑定到EF Core不支持的TPT / TPH模型），因此EF版本是6.1.3针对.NET 4.6.1。

我是on VS Community 2015 Update 3 Version 14.0.25431.01。

更新

无法复制，但问题即使添加虚拟启动项目也会发生。

发布的问题这里，请投票并分享您的实验。

解决方案

根据此（测试和工作），启用迁移的唯一方法aspnetcore + ef6项目，是在外部完整的.NET类库中添加 DbContext ，并添加一个虚拟启动项目。

吮吸但是作品。

I'm developing a project that will use ASP.NET Web API as the data service, and a Xamarin portable app as client.

I'm trying to enable migrations in the web app, but I get the following error:

Enable-Migrations -enableautomaticmigrations -ContextTypeName MyProject.Models.ApplicationDbContext -ProjectName MyProject -StartupProjectName MyProject.App -Verbose
Using StartUp project 'MyProject.App'.
Exception calling "SetData" with "2" argument(s): "Type 'Microsoft.VisualStudio.ProjectSystem.VS.Implementation.Package.Automation.OAProject' in assembly 
'Microsoft.VisualStudio.ProjectSystem.VS.Implementation, Version=14.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' is not marked as serializable."
At C:\Users\weitz\.nuget\packages\EntityFramework\6.1.3\tools\EntityFramework.psm1:718 char:5
+     $domain.SetData('project', $project)
+     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
    + FullyQualifiedErrorId : SerializationException

Exception calling "SetData" with "2" argument(s): "Type 'Microsoft.VisualStudio.ProjectSystem.VS.Implementation.Package.Automation.OAProject' in assembly 
'Microsoft.VisualStudio.ProjectSystem.VS.Implementation, Version=14.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' is not marked as serializable."
At C:\Users\weitz\.nuget\packages\EntityFramework\6.1.3\tools\EntityFramework.psm1:719 char:5
+     $domain.SetData('contextProject', $contextProject)
+     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
    + FullyQualifiedErrorId : SerializationException

System.NullReferenceException: Object reference not set to an instance of an object.
   at System.Data.Entity.Migrations.Extensions.ProjectExtensions.GetPropertyValue[T](Project project, String propertyName)
   at System.Data.Entity.Migrations.MigrationsDomainCommand.GetFacade(String configurationTypeName, Boolean useContextWorkingDirectory)
   at System.Data.Entity.Migrations.EnableMigrationsCommand.FindContextToEnable(String contextTypeName)
   at System.Data.Entity.Migrations.EnableMigrationsCommand.<>c__DisplayClass2.<.ctor>b__0()
   at System.Data.Entity.Migrations.MigrationsDomainCommand.Execute(Action command)
Object reference not set to an instance of an object.
**PM>**

As you can see, I've tried specifying the start up project explicitly but doesn't look like the enable-migrations command is so happy about it.

It's a project I just created that uses full .NET (I'm bound to TPT/TPH model which EF Core doesn't support yet), so the EF version is 6.1.3 targeting .NET 4.6.1.

I'm on VS Community 2015 Update 3 Version 14.0.25431.01.

Update

Can't reproduce, but the issue happens even when adding a dummy start up project.
Cross posted issue here, please vote and share your experiments.

解决方案

Well according to this (tested and works), the only way to enable migrations in aspnetcore+ef6 project, is to have the DbContext impl in an external full .NET class library, plus adding a dummy start up project.
Sucks but works.

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