如何在桌面应用程序中将DbContext与DI一起使用？

// Step 1: 定义DbContext类
public class MyDbContext : DbContext
{
    public MyDbContext(DbContextOptions<MyDbContext> options) : base(options)
    {
    }

    // 定义数据库模型
    public DbSet<User> Users { get; set; }
    // ...
}

// Step 2: 配置依赖注入容器
public static IHostBuilder CreateHostBuilder(string[] args) =>
    Host.CreateDefaultBuilder(args)
        .ConfigureServices((hostContext, services) =>
        {
            // 注册DbContext和相关服务
            services.AddDbContext<MyDbContext>(options =>
                options.UseSqlServer(Configuration.GetConnectionString("DefaultConnection")));
            // ...
        });

// Step 3: 在需要使用DbContext的类中注入DbContext
public class MyService
{
    private readonly MyDbContext _dbContext;

    public MyService(MyDbContext dbContext)
    {
        _dbContext = dbContext;
    }

    public void DoSomething()
    {
        // 使用DbContext进行数据库操作
        var users = _dbContext.Users.ToList();
        // ...
    }
}

// Step 4: 在应用程序中使用MyService
public class Program
{
    private readonly MyService _myService;

    public Program(MyService myService)
    {
        _myService = myService;
    }

    public void Run()
    {
        _myService.DoSomething();
        // ...
    }

    public static void Main(string[] args)
    {
        var host = CreateHostBuilder(args).Build();
        var program = ActivatorUtilities.CreateInstance<Program>(host.Services);
        program.Run();
    }
}