net core 3.1  Authorize
1
//配置authorrize
services.AddAuthentication(b =>
            {
                b.DefaultAuthenticateScheme = CookieAuthenticationDefaults.AuthenticationScheme;
                b.DefaultChallengeScheme = CookieAuthenticationDefaults.AuthenticationScheme;
                b.DefaultSignInScheme = CookieAuthenticationDefaults.AuthenticationScheme;
            }).
            AddCookie(b =>
            {
    //登陆地址
    b.LoginPath = "/login";
    //sid
    b.Cookie.Name = "My_SessionId";
    // b.Cookie.Domain = "shenniu.core.com";
    b.Cookie.Path = "/";
    b.Cookie.HttpOnly = true;
    //b.Cookie.Expiration = new TimeSpan(0, 0, 30);

    b.ExpireTimeSpan = new TimeSpan(0, 0, 30);
});

2.
Configure
//启用身份认证，启用后可以在Controller中使用User API
app.UseAuthentication();

3.

   string name = "罗分明";
//登陆授权
var claims = new List<Claim>();
claims.Add(new Claim(ClaimTypes.Name, name));
                var indentity = new ClaimsIdentity(claims, "denglu");
var principal = new ClaimsPrincipal(indentity);
await HttpContext.SignInAsync(
    CookieAuthenticationDefaults.AuthenticationScheme,
    principal);
                //验证是否授权成功
                if (principal.Identity.IsAuthenticated)
                {
                    return Redirect("/home/index");
                }

4.
[Authorize(AuthenticationSchemes = CookieAuthenticationDefaults.AuthenticationScheme)]

var a = User.Identity.Name;