添加迁移异常

Question

当我尝试添加迁移时，出现此错误：

 PM> add-migration RestrictPromotionContentAndTitle
    System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.IO.FileNotFoundException: Could not load file or assembly 'Microsoft.Build.Framework, Version=15.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified.
       at BrightInfo.Infrastructure.Settings.DbAudit.AuditDbContext..ctor(String connString)
       at BrightInfo.Infrastructure.Settings.BrightInfoContext..ctor(Boolean proxyCreationEnabled, Boolean lazyLoadingEnabled) in C:\Projects\BrightInfo\BrightInfo.Infrastructure.Settings\BrightInfoContext.cs:line 124
       at BrightInfo.Infrastructure.Settings.BrightInfoContext..ctor() in C:\Projects\BrightInfo\BrightInfo.Infrastructure.Settings\BrightInfoContext.cs:line 113
       --- End of inner exception stack trace ---
       at System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandleInternal& ctor, Boolean& bNeedSecurityCheck)
       at System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache, StackCrawlMark& stackMark)
       at System.RuntimeType.CreateInstanceDefaultCtor(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache, StackCrawlMark& stackMark)
       at System.Activator.CreateInstance(Type type, Boolean nonPublic)
       at System.Activator.CreateInstance(Type type)
       at System.Data.Entity.Infrastructure.DbContextInfo.<CreateActivator>b__0()
       at System.Data.Entity.Infrastructure.DbContextInfo..ctor(Type contextType, DbProviderInfo modelProviderInfo, AppConfig config, DbConnectionInfo connectionInfo)
       at System.Data.Entity.Infrastructure.DbContextInfo..ctor(Type contextType)
       at System.Data.Entity.Migrations.DbMigrator..ctor(DbMigrationsConfiguration configuration, DbContext usersContext)
       at System.Data.Entity.Migrations.DbMigrator..ctor(DbMigrationsConfiguration configuration)
       at System.Data.Entity.Migrations.Design.ToolingFacade.BaseRunner.GetMigrator()
       at System.Data.Entity.Migrations.Design.ToolingFacade.GetPendingMigrationsRunner.RunCore()
       at System.Data.Entity.Migrations.Design.ToolingFacade.BaseRunner.Run()
    Exception has been thrown by the target of an invocation.

谁知道如何解决这个问题？ 提前致谢。

PS：我忘了提到当我切换到包管理器控制台时，我收到此错误消息：

    Unable to find type [NuGet.PackageManager]. Make sure that the assembly that contains this type is loaded.
At C:\Projects\BrightInfo\packages\T4Scaffolding.Core.1.0.0\tools\init.ps1:4 char:5
+ if ([NuGet.PackageManager].Assembly.GetName().Version -lt 1.4)
+     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (NuGet.PackageManager:TypeName) [], RuntimeException
    + FullyQualifiedErrorId : TypeNotFound

有人知道如何解决吗？ 谢谢。

Answer 1

似乎您的项目中没有正确的 dll 引用。

无法加载文件或程序集“Microsoft.Build.Framework，Version=15.1.0.0，Culture=neutral，PublicKeyToken=b03f5f7f11d50a3a”或其依赖项之一。 系统找不到指定的文件。 在...

如果您可以添加适当的dll并清理解决方案，重建解决方案然后再试一次，您应该可以成功执行。 如果进一步的错误仍然存​​在，请发布您找到的迁移详细信息，以便更好地理解和帮助您。

HTH

Answer 2

我通过添加修复它：{ get; 设置; 到我的所有属性