从Core MVC中的cookie中的声明中检索Userid

Question

我想在ASP.NET Core MVC中将userId存储在cookie中.我在哪里可以访问它？

登录:

var claims = new List<Claim> {
    new Claim(ClaimTypes.NameIdentifier, "testUserId")
};

var userIdentity = new ClaimsIdentity(claims, "webuser");
var userPrincipal = new ClaimsPrincipal(userIdentity);
HttpContext.Authentication.SignInAsync("Cookie", userPrincipal,
    new AuthenticationProperties
    {
        AllowRefresh = false
    });

登出:

User.Identity.GetUserId(); // <-- 'GetUserId()' doesn't exists!?

ClaimsPrincipal user = User;
var userName = user.Identity.Name; // <-- Is null.

HttpContext.Authentication.SignOutAsync("Cookie");

这可能在MVC 5中------------------->

登录:

// Create User Cookie
var claims = new List<Claim>{
        new Claim(ClaimTypes.NameIdentifier, webUser.Sid)
    };

var ctx = Request.GetOwinContext();
var authenticationManager = ctx.Authentication;
authenticationManager.SignIn(
    new AuthenticationProperties
    {
        AllowRefresh = true // TODO 
    },
    new ClaimsIdentity(claims, DefaultAuthenticationTypes.ApplicationCookie)
);

获取UserId:

public ActionResult TestUserId()
{
    IPrincipal iPrincipalUser = User;
    var userId = User.Identity.GetUserId(); // <-- Working
}

更新 - 添加了声明为null的屏幕截图-------

userId也是null.

Answer 1

你应该可以通过HttpContext获取它:

var userId = context.User.Claims.FirstOrDefault(x => x.Type == ClaimTypes.NameIdentifier)?.Value;

在示例上下文中是HttpContext.

Startup.cs(只是模板网站中的基础知识):

public void ConfigureServices(IServiceCollection services)
{
    services.AddIdentity<ApplicationUser, IdentityRole>()
        .AddEntityFrameworkStores<ApplicationDbContext>()
        .AddDefaultTokenProviders();
    services.AddMvc();
}

public void Configure(IApplicationBuilder app)
{
    app.UseIdentity();
    app.UseMvc();
}

Answer 2

使用ClaimsPrincipal类的FindFirst方法：

var userId = context.User.FindFirst(ClaimTypes.NameIdentifier)?.Value;