如何在总部基地服务中获取DbContext？

using Microsoft.EntityFrameworkCore;

public class MyDbContext : DbContext
{
    public MyDbContext(DbContextOptions<MyDbContext> options) : base(options)
    {
    }

    // 定义数据库中的实体类对应的DbSet
    public DbSet<User> Users { get; set; }
    // 其他实体类...

    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        // 配置实体类之间的关系、索引等
        // 可选操作
    }
}

{
  "ConnectionStrings": {
    "MyDbConnection": "Server=your_server;Database=your_database;User Id=your_user;Password=your_password;"
  }
}

using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;

public class Startup
{
    private IConfiguration Configuration { get; }

    public Startup(IConfiguration configuration)
    {
        Configuration = configuration;
    }

    public void ConfigureServices(IServiceCollection services)
    {
        // 读取配置文件中的连接字符串
        string connectionString = Configuration.GetConnectionString("MyDbConnection");

        // 注册DbContext，并指定连接字符串
        services.AddDbContext<MyDbContext>(options =>
            options.UseSqlServer(connectionString));

        // 其他服务的注册...
    }

    public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
    {
        // 配置中间件和路由规则...
    }
}

using Microsoft.AspNetCore.Mvc;
using System.Linq;

public class UserController : ControllerBase
{
    private readonly MyDbContext _dbContext;

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

    public IActionResult GetUsers()
    {
        var users = _dbContext.Users.ToList();
        // 处理用户数据...
        return Ok(users);
    }

    // 其他操作...
}