ASP.NET Core：自定义cookie处理

Question

I need to have some cookie processing in my app (update session variable on signing-in/out). First, I have some identity config:

    public void ConfigureServices(IServiceCollection services)
    {
        //omitted
        services.AddIdentity<ApplicationUser, IdentityRole>(i =>
        {
            i.Lockout = new LockoutOptions()
            {
                DefaultLockoutTimeSpan = TimeSpan.FromMinutes(1),
                MaxFailedAccessAttempts = 5
            };
            i.Password.RequireDigit = true;
            i.Password.RequireLowercase = true;
        })
        //omitted
    }

As the documentation suggests I added cookie middleware into the pipeline like this:

    public void Configure(IApplicationBuilder app)
    {
        //omitted
        app.UseCookieAuthentication(new CookieAuthenticationOptions()
        {
            Events = new CookieAuthenticationEvents
            {
                OnSigningIn = app.ApplicationServices
                        .GetRequiredService<MyService>().DoSomething
            }

        });

        app.UseIdentity();
        //omitted
    }

That all doesn't work. DoSomething isn't called. If I write a lambda in ConfigureServices it works:

i.Cookies.ApplicationCookie.Events = new CookieAuthenticationEvents    
{
    OnSigningIn = async context => { await Task.FromResult(1); }
};

So the question (actually two). How can I request a service in the ConfigureServices method OR how make the Events in the UseCookieAuthentication work?

Answer 1

一旦事件需要回调（稍后将在设置了所有服务时调用）并且回调接受可以访问HttpContext BasePrincipalContext ，我可以声明一个静态方法，其中HttpContext.RequestServices.GetRequiredService<Type>()可以调用HttpContext.RequestServices.GetRequiredService<Type>()以便获得一个需要的服务实例