用c#写一个宠物管理系统

好的，下面是一个使用C#写的宠物管理系统的代码示例：

using System;
using System.Collections.Generic;

namespace PetManagementSystem
{
    // User class
    public class User
    {
        public int Id { get; set; }
        public string Username { get; set; }
        public string Password { get; set; }
        public string Email { get; set; }
        public List<Pet> Pets { get; set; }
    }

    // Pet class
    public class Pet
    {
        public int Id { get; set; }
        public string Name { get; set; }
        public string Type { get; set; }
        public int Age { get; set; }
    }

    // Pet management system class
    public class PetManagementSystem
    {
        private List<User> _users;
        private int _nextUserId;
        private int _nextPetId;

        public PetManagementSystem()
        {
            _users = new List<User>();
            _nextUserId = 1;
            _nextPetId = 1;
        }

        // Register a new user
        public void Register(string username, string password, string email)
        {
            User user = new User
            {
                Id = _nextUserId,
                Username = username,
                Password = password,
                Email = email,
                Pets = new List<Pet>()
            };
            _users.Add(user);
            _nextUserId++;
        }

        // Login with a username and password
        public User Login(string username, string password)
        {
            foreach (User user in _users)
            {
                if (user.Username == username && user.Password == password)
                {
                    return user;
                }
            }
            return null;
        }

        // Add a new pet for the specified user
        public void AddPet(User user, string name, string type, int age)
        {
            Pet pet = new Pet
            {
                Id = _nextPetId,
                Name = name,
                Type = type,
                Age = age,
            };
            user.Pets.Add(pet);
            _nextPetId++;
        }

        // Get all pets for the specified user
        public List<Pet> GetPets(User user)
        {
            return user.Pets;
        }

        // Update a pet for the specified user
        public void UpdatePet(User user, Pet pet, string name, string type, int age)
        {
            pet.Name = name;
            pet.Type = type;
            pet.Age = age;
        }

        // Delete a pet for the specified user
        public void DeletePet(User user, Pet pet)
        {
            user.Pets.Remove(pet);
        }
    }

    // Example usage
    class Program
    {
        static void Main(string[] args)
        {
            PetManagementSystem system = new PetManagementSystem();

            // Register a new user
            system.Register("testuser", "password", "testuser@example.com");

            // Login with the registered user
            User user = system.Login("testuser", "password");

            // Add a new pet for the user
            system.AddPet(user, "Fluffy", "Cat", 3);

            // Get all pets for the user
            List<Pet> pets = system.GetPets(user);
            foreach (Pet pet in pets)
            {
                Console.WriteLine("Name: {0}, Type: {1}, Age: {2}", pet.Name, pet.Type, pet.Age);
            }

            // Update the pet information
            Pet petToUpdate = pets[0];
            system.UpdatePet(user, petToUpdate, "Mittens", "Cat", 4);
            Console.WriteLine("Updated pet information:");
            Console.WriteLine("Name: {0}, Type: {1}, Age: {2}", petToUpdate.Name, petToUpdate.Type, petToUpdate.Age);

            // Delete the pet
            Pet petToDelete = pets[0];
            system.DeletePet(user, petToDelete);
            Console.WriteLine("Pet deleted.");
        }
    }
}

以上代码实现了一个简单的宠物管理系统，使用了C#语言，包括了用户注册、登录、添加宠物、查看宠物、修改宠物信息、删除宠物等功能。可以根据实际需求进行修改和扩展。