Unit of Work Repository

unit-of-work-repository.cs

public class CustomerRepository : RepositoryBase<SampleDBContext>, IRespository<Guid, Customer>
{
    public CustomerRepository(SubscriptionDBContext _context) : base(_context)
    {
    }
    public void Create(Customer customer)
    {
        Context.Customers.Add(customer);
    }
    public void Delete(Guid id)
    {
        var customerToDelete = Context.Customers.FirstOrDefault(c => c.Id == id);
        Context.Customers.Remove(customerToDelete);
    }
    public IQueryable<Customer> Get(Expression<Func<Customer, bool>> predicate, int currentPage = 0, int pageSize = 0)
    {
        if (pageSize == 0)
        {
            return Context.Customers
                .Where(predicate);
        }
        return Context.Customers
                .Where(predicate)
                .Skip((currentPage - 1) * pageSize)
                .Take(pageSize);
    }
    public async Task<Customer> GetAsync(Guid Id)
    {
        return await Context.Customers.FirstOrDefaultAsync(c => c.Id == Id);
    }
    public void Update(Guid id, Customer customer)
    {
        customer.Id = id;
        Context.Entry(customer).State = EntityState.Modified;
    }
    public void Upsert(Guid id, Customer customer)
    {
        customer.Id = id;
        if (customer.Id != Guid.Empty)
        {
            Context.Entry(customer).State = EntityState.Modified;
        }
        else
        {
            Context.Customers.Add(customer);
        }
    }
}