using System;

using System.Linq;

using System.Collections.Generic;

using System.Security.Claims;

public class Program

{

    public static void Main()

    {

            var claims = new List<Claim>

            {

                new Claim(ClaimTypes.Name,"test name"),

                new Claim("Token","token123"),

                new Claim("Number","3")

                //new Claim("dummy","dummy string")

            };

            var ci = new ClaimsIdentity(claims);

​

            //most seen way, throw error if not exists

            var name = ci.Claims.First(x => x.Type == ClaimTypes.Name).Value;

            var token = ci.Claims.First(x => x.Type == "Token").Value;

            //using FirstOrDefault() only, throw error if not exists

            //var dunno = ci.Claims.FirstOrDefault(x => x.Type == "dunno").Value;

​

            //safe way: using HasClaim to check

            var dummy = ci.HasClaim(x => x.Type == "dummy")

                ? ci.Claims.First(x => x.Type == "dummy").Value

                : null;

            //short way: using FindFirst

            var dummyShort = ci.FindFirst("dummy")?.Value;

            //short way for int

            int.TryParse(ci.FindFirst("Number")?.Value, out var number);

​

            //fixed FirstOrDefault way: return null if not exists

            var dunno = ci.Claims.Where(x => x.Type == "dunno").Select(x => x.Value).FirstOrDefault();

​

            Console.WriteLine($"Name:{name}");

            Console.WriteLine($"Token:{token}");

            Console.WriteLine($"dunno:{dunno??"null"}");

            Console.WriteLine($"dummy:{dummy??"null"}");

            Console.WriteLine($"dummy:{dummyShort ?? "null"}");

            Console.WriteLine($"Number:{number}");

    }

}