一个选项是在 JwtBearerEvent OnTokenValidated 事件上验证当前用户，该事件将在每次成功验证后触发

One option is to validate the current user on the JwtBearerEvent OnTokenValidated event which will be triggered after every successful authentication

services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
        .AddJwtBearer(options => {

        options.Events = new JwtBearerEvents
            {
                OnTokenValidated = context =>
                {
                    var userService = ServiceProvider.GetService<IUserService>();
                    if(userService.IsUserRemoved(context.Principal.Identity.Name))
                        context.Fail("User is removed");

                    return Task.CompletedTask;
                }
            };
        });

注意:在此示例中，我使用 ServiceProvider 来获取 IUserService 的实例，该实例作为参数存储在 Startup.cs 类中.在 ConfigureServices 方法中初始化为 ServiceProvider = services.BuildServiceProvider();.IUserService 是一个包装类，您需要在其中实现 IsUserRemoved 方法，该方法将对您的用户提供程序实现进行操作.

Note: In this example I use ServiceProvider, to get the an instance of IUserService, which is stored in the Startup.cs class as a parameter. Initialized as ServiceProvider = services.BuildServiceProvider(); in the ConfigureServices method. The IUserService is a wrapper class where you need to implement the IsUserRemoved method which will operate on your user provider implementation.