我正在开发一个项目,它将使用Xamarin Web API作为数据服务,并使用ASP.NET便携应用程序作为客户端。
我正在尝试在web应用程序中启用迁移,但收到以下错误:
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>**
正如您所看到的,我已经尝试显式地指定了启动项目,但看起来enable-migrations命令对此并不满意。
这是我刚刚创建的一个项目,它使用了完整的.NET (我绑定到EF Core还不支持的TPT/TPH模型),所以EF版本是6.1.3,目标是.NET 4.6.1。
我正在使用VS社区2015更新3版本14.0.25431.01。
更新
无法重现,但即使在添加虚拟启动项目时也会出现此问题。
交叉发布的问题here,请投票并分享你的实验。
发布于 2017-07-16 21:54:18
根据this (已测试并正常工作)的说法,在aspnetcore+ef6项目中启用迁移的唯一方法是将DbContext
添加到外部完整的.NET类库中,外加添加一个虚拟启动项目。
虽然很烂,但很管用。
https://stackoverflow.com/questions/42150540
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