Working on a read-only api service and making use of generics to package the operation into convention based process.

Repository interface:

public interface IRepository<TIdType,TEntityType> where TEntityType:class {
   Task<EntityMetadata<TIdType>> GetMetaAsync();
}

Repository implementation:

public class Repository<TIdType,TEntityType> : IRepository<TIdType,TEntityType> where TEntityType:class {
   public Repository(string connectionString) { // initialization }
   public async Tas<EntityMetadata<TIdType>> GetMetaAsync() { // implementation   }
}

In Startup.cs -> ConfigureServices :

services.AddSingleton<IRepository<int, Employee>> ( p=> new Repository<int, Employee>(connectionString));
services.AddSingleton<IRepository<int, Department>> ( p=> new Repository<int, Department>(connectionString));
// and so on

Controller:

public class EmployeeController : Controller {
   public EmployeeController(IRepository<int,Employee> repo) {//stuff}
}

I am currently repeating the repository implmentation for all types of entity types in the ConfigureServices. Is there a way to make this generic too?

services.AddSingleton<IRepository<TIdType, TEntityType>> ( p=> new Repository<TIdType, TEntityType>(connectionString));

so in the controller constructor call can automatically get the relevant repository?

Update 1: Not a duplicate:

1. The repository implementation does not have default constructor
2. Because it does not have default constructor, I cannot provide the solution given in the linked question.
3. When trying services.AddScoped(typeof(IRepository<>), ...) I am getting error Using the generic type 'IRepostiory<TIdType,TEntityType>' requires 2 type arguments