vkhorikov / efcoreencapsulation Goto Github PK

More of a question than an issue since the course does not speak about adding migrations. I am getting the following error when trying to add a new migration script using the add-migration command. The verbose switch reveals this:

Microsoft.EntityFrameworkCore.Design.OperationException: Unable to create an object of type 'MyDBContext'. For the different patterns supported at design time, see https://go.microsoft.com/fwlink/?linkid=851728
---> System.InvalidOperationException: Unable to resolve service for type 'System.String' while attempting to activate 'MyEFCoreProject.EntityFrameworkCore.MyDBContext'.
at Microsoft.Extensions.DependencyInjection.ActivatorUtilities.ConstructorMatcher.CreateInstance(IServiceProvider provider)
at Microsoft.Extensions.DependencyInjection.ActivatorUtilities.CreateInstance(IServiceProvider provider, Type instanceType, Object[] parameters)
at Microsoft.Extensions.DependencyInjection.ActivatorUtilities.GetServiceOrCreateInstance(IServiceProvider provider, Type type)
at Microsoft.EntityFrameworkCore.Design.Internal.DbContextOperations.<>c__DisplayClass21_4.b__13()
--- End of inner exception stack trace ---
at Microsoft.EntityFrameworkCore.Design.Internal.DbContextOperations.<>c__DisplayClass21_4.b__13()
at Microsoft.EntityFrameworkCore.Design.Internal.DbContextOperations.CreateContext(Func1 factory) at Microsoft.EntityFrameworkCore.Design.Internal.DbContextOperations.CreateContext(String contextType) at Microsoft.EntityFrameworkCore.Design.Internal.MigrationsOperations.AddMigration(String name, String outputDir, String contextType, String namespace) at Microsoft.EntityFrameworkCore.Design.OperationExecutor.AddMigrationImpl(String name, String outputDir, String contextType, String namespace) at Microsoft.EntityFrameworkCore.Design.OperationExecutor.AddMigration.<>c__DisplayClass0_0.<.ctor>b__0() at Microsoft.EntityFrameworkCore.Design.OperationExecutor.OperationBase.<>c__DisplayClass3_01.b__0()
at Microsoft.EntityFrameworkCore.Design.OperationExecutor.OperationBase.Execute(Action action)

Not quite sure what I am doing wrong. I also reverted the constructor and registration back to the original before your encapsulation modifications and also got an error message.

System.InvalidOperationException: Unable to resolve service for type 'Microsoft.EntityFrameworkCore.DbContextOptions`1

Program.cs

//builder.Services.AddScoped(_ => new PaceFillsContext(builder.Configuration["ConnectionString"], true));

builder.Services.AddDbContext(options =>
options.UseSqlServer(builder.Configuration["ConnectionString"]));

Before builder.Build() is called

public MyDBContext(DbContextOptions options) : base(options)
{
}

//public MyDBContext(string connectionString, bool useConsoleLogger)
//{
//    _connectionString = connectionString;
//    _useConsoleLogger = useConsoleLogger;
//}

Good afternoon.

I looked at your course and I had a question.
You are considering the context connection option as AddContext(). In this case, everything is fine in your example. But what if I want to use AddPooledDbContextFactory(). How do I implement a factory and encapsulate the logic?