C#仓库模式中的异步编程

public interface IRepository<T>
{
    Task<T> GetByIdAsync(int id);
    Task<IEnumerable<T>> GetAllAsync();
    Task AddAsync(T entity);
    Task UpdateAsync(T entity);
    Task DeleteAsync(int id);
}

public class UserRepository : IRepository<User>
{
    private readonly DbContext _context;

    public UserRepository(DbContext context)
    {
        _context = context;
    }

    public async Task<User> GetByIdAsync(int id)
    {
        return await _context.Users.FindAsync(id);
    }

    public async Task<IEnumerable<User>> GetAllAsync()
    {
        return await _context.Users.ToListAsync();
    }

    public async Task AddAsync(User user)
    {
        await _context.Users.AddAsync(user);
        await _context.SaveChangesAsync();
    }

    public async Task UpdateAsync(User user)
    {
        _context.Users.Update(user);
        await _context.SaveChangesAsync();
    }

    public async Task DeleteAsync(int id)
    {
        var user = await _context.Users.FindAsync(id);
        if (user != null)
        {
            _context.Users.Remove(user);
            await _context.SaveChangesAsync();
        }
    }
}