using System;

using System.Net.Http.Headers;

public class Program

{

    public static void Main()

    {

        ParseAndPrint("null", null);

        ParseAndPrint("empty", "");

        ParseAndPrint("whitespace", "   ");

        ParseAndPrint("invalid", "max-age=-1");

        ParseAndPrint("simple", "max-age=60");

        ParseAndPrint("comma-separated", "max-age=60,no-cache");

        ParseAndPrint("comma-whitespace-separated", "max-age=60, no-store");

        ParseAndPrint("comma-weird-whitespace-separated", "max-age=60,no-cache  , no-cache,\tno-store");

    }

    public static void ParseAndPrint(string name, string cchvstr)

    {

        CacheControlHeaderValue cchv;

        Console.WriteLine(name+":");

        if (!CacheControlHeaderValue.TryParse(cchvstr, out cchv))

        {

            Console.WriteLine("\tNot parsed!");

            return;

        }

        if (cchv == null)

        {

            Console.WriteLine("\tnull!");

            return;

        }

        Console.WriteLine("\tmax-age: "+cchv.MaxAge);

        Console.WriteLine("\tno-cache: "+cchv.NoCache);

        Console.WriteLine("\tno-store: "+cchv.NoStore);

    }

}