using System;

using System.Linq;

using System.Collections.Generic;

using Microsoft.EntityFrameworkCore;

​

public class Program

{

    public static void Main()

    {

    }

    public interface IRepository<T> where T : class

    {

        public List<T> GetAllEntities();

        public T Get(int id);

​

        public T Add(T entity);

​

        public T Update(T entity);

​

        public T Delete(int id);

    }

    public abstract class BaseRepository<TEntity, TContext> : IRepository<TEntity>

        where TEntity : class

        where TContext : DbContext

    {

        private readonly TContext _dbContext;

​

        protected BaseRepository(TContext dbContext)

        {

            _dbContext = dbContext;

        }

​

        public List<TEntity> GetAllEntities()

        {

            return _dbContext.Set<TEntity>().ToList();

        }

​

        public TEntity Get(int id)

        {

            return _dbContext.Set<TEntity>().Find(id);

        }

​

        public TEntity Add(TEntity entity)

        {

            _dbContext.Set<TEntity>().Add(entity);

            _dbContext.SaveChanges();

            return entity;

        }

​

        public TEntity Update(TEntity entity)

        {

            throw new NotImplementedException();

        }

​

        public TEntity Delete(int id)

        {

            throw new NotImplementedException();

        }

    }

}