獲取同時執行實體框架遷移以下錯誤VS 2015 - EF遷移命令
dotnet.exe信息:System.ArgumentNullException:值不能爲null.At行:1個字符:1 + DOTNET EF - enter code here
-startup-項目../Bloomerang.Web migration增加AssessmentQuestions + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo:NotSpecified:(System .Argument ...不能爲null.:String)[],RemoteException + FullyQualifiedErrorId:NativeCommandError
參數名稱:的connectionString
在Microsoft.EntityFrameworkCore.Utilities.Check.NotEmpty(字符串值,字符串parameterName)以
在Microsoft.EntityFrameworkCore.SqlServerDbContextOptionsExtensions.UseSqlServer(DbContextOptionsBuilder optionsBuilder,字符串的connectionString,Action`1 sqlServerOptionsAction)
在Bloomerang.Web.Startup.b__4_0(DbContextOptionsBuilder選項)
在Microsoft.Extensions.DependencyInjection.EntityFrameworkServiceCollectionExtensions.DbContextOptionsFactory [TContext](IS erviceProvider applicationServiceProvider,Action`2 optionsAction)
在Microsoft.Extensions.DependencyInjection.ServiceProvider.ScopedCallSite.Invoke(的ServiceProvider提供商)
在Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService(的IServiceProvider提供商類型的serviceType)
在Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService [T](的IServiceProvider提供商)
在Microsoft.Extensions.DependencyInje ction.ServiceProvider.ScopedCallSite.Invoke(的ServiceProvider提供商)
在Microsoft.Extensions.DependencyInjection.ServiceLookup.ClosedIEnumerableService.CallSite.Invoke(的ServiceProvider提供商)
在Microsoft.Extensions.DependencyInjection.ServiceProvider.TransientCallSite.Invoke(的ServiceProvider提供商)
在Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService(IServiceProvider的供應商,類型的serviceType)
在Microsoft.Extensions.DependencyInjection.ServiceProviderServic eExtensions.GetRequiredService [T](的IServiceProvider提供商)
在Microsoft.EntityFrameworkCore.Design.DbContextOperations.FindContextTypes()
在Microsoft.EntityFrameworkCore.Design.DbContextOperations.FindContextType(字符串名稱)
在微軟.EntityFrameworkCore.Design.DbContextOperations.CreateContext(String contextType)
at Microsoft.EntityFrameworkCore.Design.MigrationsOperations。AddMigration(字符串名稱,字符串outputDir,字符串contextType)
在Microsoft.EntityFrameworkCore.Tools.Cli.MigrationsAddCommand.Execute(CommonOptions commonOptions,字符串名稱,字符串outputDir,絃樂背景下,字符串環境,Action`1 記者)
at Microsoft.EntityFrameworkCore.Tools.Cli.MigrationsAddCommand。 <> c__DisplayClass0_0.b__0()
在Microsoft.Extensions.CommandLineUtils.CommandLineApplication.Execute(字串[] args)
在Microsoft.EntityFrameworkCore.Tools.Cli.Program.Main(字串[] args)
值不能爲空。
參數名:ConnectionString的