创建泛型类型实例的泛型存储库

using System;
using System.Collections.Generic;
using System.Linq;

public interface IRepository<T> where T : class
{
    IEnumerable<T> GetAll();
    T GetById(int id);
    void Add(T entity);
    void Update(T entity);
    void Delete(int id);
}

public class GenericRepository<T> : IRepository<T> where T : class
{
    private readonly List<T> _entities;

    public GenericRepository()
    {
        _entities = new List<T>();
    }

    public IEnumerable<T> GetAll()
    {
        return _entities;
    }

    public T GetById(int id)
    {
        return _entities.FirstOrDefault(e => GetId(e) == id);
    }

    public void Add(T entity)
    {
        _entities.Add(entity);
    }

    public void Update(T entity)
    {
        var existingEntity = GetById(GetId(entity));
        if (existingEntity != null)
        {
            // Update properties
        }
    }

    public void Delete(int id)
    {
        var entityToDelete = GetById(id);
        if (entityToDelete != null)
        {
            _entities.Remove(entityToDelete);
        }
    }

    private int GetId(T entity)
    {
        // Assuming the entity has an 'Id' property
        var property = typeof(T).GetProperty("Id");
        return (int)property.GetValue(entity);
    }
}

public IEnumerable<T> Find(Expression<Func<T, bool>> predicate)
{
    return _entities.Where(predicate);
}