services.AddDbContext
public void Configure(IApplicationBuilder app, IHostingEnvironment env, ApplicationDbContext context) { // 执行数据迁移 context.Database.Migrate();
// 中间件配置
// ...
}
// 查询并返回Product对象及其关联的Category对象 var product = _context.Products.Include(p => p.Category).FirstOrDefault(p => p.Id == 1);
// 查询仅返回Product对象 var product = _context.Products.Select(p => new {p.Id, p.Name, p.Price}).FirstOrDefault(p => p.Id == 1);