将接口扩展到基本抽象 class

Question

I'm trying to have a base service that has common functionality that is inherited by all other services, but am having trouble and getting the following error:

Type 'BaseService<Test>' in interface list is not an interface

Can anyone suggest a way to fix this? Or a better way to go about this?

Base Service

public class BaseService<T> where T : BaseEntity
    {
        private readonly Context _db;
        public BaseService()
        {

        }
        public BaseService(Context db)
        {
            _db = db;
        }
        public async Task<bool> Insert(T entity)
        {
            entity.ModifiedOn = DateTime.UtcNow;
            await _db.Set<T>().AddAsync(entity);
            try
            {
                return await _db.SaveChangesAsync() > 0 ? true : false;
            }
            catch (Exception ex)
            {
                return false;
            }
        }
    }

And then a normal service that would have access to this but where the error is displaying

public interface ITestService : BaseService<Test>
    {
    }

Answer 1

An interface cannot inherit from a class. Here BaseService<T> is defined as a class.

A way to fix it is to declare the service as a class, as follow:

public class TestService : BaseService<Test>
{
}