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public abstract class EntityBase
{
    public int Id { get; protected set; }
}

public class Repository<T> : IRepository<T> where T : EntityBase
{
    private readonly ApplicationDbContext _dbContext;

    public Repository(ApplicationDbContext dbContext)
    {
        _dbContext = dbContext;
    }

    public virtual T GetById(int id)
    {
        return _dbContext.Set<T>().Find(id);
    }

    public virtual IEnumerable<T> List()
    {
        throw new NotImplementedException();
        //return _dbContext.Set<T>().AsEnumerable();
    }

    public virtual IEnumerable<T> List(System.Linq.Expressions.Expression<Func<T, bool>> predicate)
    {
        throw new NotImplementedException();
        //return _dbContext.Set<T>()
        //       .Where(predicate)
        //       .AsEnumerable();
    }

    public void Insert(T entity)
    {
        _dbContext.Set<T>().Add(entity);
        _dbContext.SaveChanges();
    }

    public void Update(T entity)
    {
        _dbContext.Entry(entity).State = EntityState.Modified;
        _dbContext.SaveChanges();
    }

    public void Delete(T entity)
    {
        _dbContext.Set<T>().Remove(entity);
        _dbContext.SaveChanges();
    }
}

public interface IRepository<T> where T : EntityBase
{
    T GetById(int id);
    IEnumerable<T> List();
    IEnumerable<T> List(Expression<Func<T, bool>> predicate);
    void Insert(T entity);
    void Delete(T entity);
    void Update(T entity);
}