Когда я пытаюсь запустить
dotnet ef migration add Init
Я получаю ошибку
Невозможно создать объект типа 'IdentityContext'.
Я знаю, что вызвало проблему. Я хотел научиться использовать шину сообщений и добавил ее в свой проект, поэтому я выбрал некоторый курс и реализовал его. Ofc bus работает отлично. Но проблема в том, что я больше не могу мигрировать через EF.
Мой Startup.cs раньше был.
public class Program
{
public static void Main(string[] args)
{
CreateWebHostBuilder(args).Build().Run();
}
public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
WebHost.CreateDefaultBuilder(args)
.UseStartup<Startup>();
}
Теперь это выглядит так.
public static void Main(string[] args)
{
ServiceHost.Create<Startup>(args)
.UseRabbitMq()
.Build()
.Run();
}
И ServiceHost класс
public void Run() => _webHost.Run();
public static HostBuilder Create<TStartup>(string[] args) where TStartup : class
{
Console.Title = typeof(TStartup).Namespace;
var config = new ConfigurationBuilder()
.AddEnvironmentVariables()
.AddCommandLine(args)
.Build();
var webHostBuilder = WebHost.CreateDefaultBuilder()
.UseConfiguration(config)
.UseStartup<TStartup>();
return new HostBuilder(webHostBuilder.Build());
}
Так кто-нибудь мог бы дать совет, почему миграция перестала работать? Для меня это выглядит так, как будто это должно сработать, но это не так, я думаю, я ошибаюсь.
И, конечно же, у меня в Startup.cs
services.AddEntityFrameworkNpgsql().AddDbContext<IdentityContext>(options =>
options.UseNpgsql(Configuration.GetConnectionString("IdentityConnection")));
EDIT
Класс IdentityContext:
public class IdentityContext : DbContext
{
public IdentityContext(DbContextOptions<IdentityContext> options) : base(options)
{
while (!Debugger.IsAttached)
{
Thread.Sleep(100);
}
}
public DbSet<User> Users { get; set; }
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
modelBuilder.Entity<User>().HasIndex(user => user.Email).IsUnique();
modelBuilder.Entity<User>().HasIndex(user => user.Username).IsUnique();
}
}
EDIT2.
Детальная миграция
Using project '/home/msek/Projects/inz/CrossX/src/CrossX.Identity/CrossX.Identity.csproj'.
Using startup project '/home/msek/Projects/inz/CrossX/src/CrossX.Identity/CrossX.Identity.csproj'.
Writing '/home/msek/Projects/inz/CrossX/src/CrossX.Identity/obj/CrossX.Identity.csproj.EntityFrameworkCore.targets'...
dotnet msbuild /target:GetEFProjectMetadata /property:EFProjectMetadataFile=/tmp/tmpCq3PQa.tmp /verbosity:quiet /nologo /home/msek/Projects/inz/CrossX/src/CrossX.Identity/CrossX.Identity.csproj
Writing '/home/msek/Projects/inz/CrossX/src/CrossX.Identity/obj/CrossX.Identity.csproj.EntityFrameworkCore.targets'...
dotnet msbuild /target:GetEFProjectMetadata /property:EFProjectMetadataFile=/tmp/tmpR48yu8.tmp /verbosity:quiet /nologo /home/msek/Projects/inz/CrossX/src/CrossX.Identity/CrossX.Identity.csproj
dotnet build /home/msek/Projects/inz/CrossX/src/CrossX.Identity/CrossX.Identity.csproj /verbosity:quiet /nologo
Build succeeded.
0 Warning(s)
0 Error(s)
Time Elapsed 00:00:01.17
dotnet exec --depsfile /home/msek/Projects/inz/CrossX/src/CrossX.Identity/bin/Debug/netcoreapp2.2/CrossX.Identity.deps.json --additionalprobingpath /home/msek/.nuget/packages --runtimeconfig /home/msek/Projects/inz/CrossX/src/CrossX.Identity/bin/Debug/netcoreapp2.2/CrossX.Identity.runtimeconfig.json /home/msek/.dotnet/tools/.store/dotnet-ef/2.2.2/dotnet-ef/2.2.2/tools/netcoreapp2.2/any/tools/netcoreapp2.0/any/ef.dll migrations add Init --assembly /home/msek/Projects/inz/CrossX/src/CrossX.Identity/bin/Debug/netcoreapp2.2/CrossX.Identity.dll --startup-assembly /home/msek/Projects/inz/CrossX/src/CrossX.Identity/bin/Debug/netcoreapp2.2/CrossX.Identity.dll --project-dir /home/msek/Projects/inz/CrossX/src/CrossX.Identity/ --language C# --working-dir /home/msek/Projects/inz/CrossX/src/CrossX.Identity --verbose --root-namespace CrossX.Identity
Using assembly 'CrossX.Identity'.
Using startup assembly 'CrossX.Identity'.
Using application base '/home/msek/Projects/inz/CrossX/src/CrossX.Identity/bin/Debug/netcoreapp2.2'.
Using working directory '/home/msek/Projects/inz/CrossX/src/CrossX.Identity'.
Using root namespace 'CrossX.Identity'.
Using project directory '/home/msek/Projects/inz/CrossX/src/CrossX.Identity/'.
Finding DbContext classes...
Finding IDesignTimeDbContextFactory implementations...
Finding application service provider...
Finding IWebHost accessor...
No CreateWebHostBuilder(string[]) method was found on type 'CrossX.Identity.Program'.
No application service provider was found.
Finding DbContext classes in the project...
Found DbContext 'IdentityContext'.
Microsoft.EntityFrameworkCore.Design.OperationException: Unable to create an object of type 'IdentityContext'. For the different patterns supported at design time, see https://go.microsoft.com/fwlink/?linkid=851728 ---> System.MissingMethodException: No parameterless constructor defined for this object.
at System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean wrapExceptions, Boolean& canBeCached, RuntimeMethodHandleInternal& ctor)
at System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean wrapExceptions, Boolean skipCheckThis, Boolean fillCache)
at Microsoft.EntityFrameworkCore.Design.Internal.DbContextOperations.<>c__DisplayClass12_3.<FindContextTypes>b__13()
--- End of inner exception stack trace ---
at Microsoft.EntityFrameworkCore.Design.Internal.DbContextOperations.<>c__DisplayClass12_3.<FindContextTypes>b__13()
at Microsoft.EntityFrameworkCore.Design.Internal.DbContextOperations.CreateContext(Func`1 factory)
at Microsoft.EntityFrameworkCore.Design.Internal.DbContextOperations.CreateContext(String contextType)
at Microsoft.EntityFrameworkCore.Design.Internal.MigrationsOperations.AddMigration(String name, String outputDir, String contextType)
at Microsoft.EntityFrameworkCore.Design.OperationExecutor.AddMigrationImpl(String name, String outputDir, String contextType)
at Microsoft.EntityFrameworkCore.Design.OperationExecutor.OperationBase.<>c__DisplayClass3_0`1.<Execute>b__0()
at Microsoft.EntityFrameworkCore.Design.OperationExecutor.OperationBase.Execute(Action action)
Unable to create an object of type 'IdentityContext'. For the different patterns supported at design time, see https://go.microsoft.com/fwlink/?linkid=851728