using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Diagnostics;

namespace ConsoleApplication15
{



    class Program
    {
        static bool IsDigitsOnlyFOREACH(string str)
        {
            foreach (char c in str)
            {
                if (c < '0' || c > '9')
                    return false;
            }

            return true;
        }

        static bool IsDigitsOnlyFOR(string str)
        {
            for (int i = 0; i < str.Length;i++ )
            {
                if (str[i] < '0' || str[i] > '9')
                    return false;
            }
            return true;
        }

        static bool IsDigitsOnlyALL(string str)
        {
            return str.All(c => c < '0' || c > '9');
        }

        static bool IsDigitsCharIsDigit(string str)
        {
            return str.All(c => char.IsDigit(c));
        }

        static bool IsDigitsOnlyPALL(string str)
        {
            bool res=  false;
            str.AsParallel().ForAll(
                c =>
                { if (c < '0' || c > '9') res = false;}
                );
            return res;
        }

        static void Main(string[] args)
        {
            string test = CreateTestData();

            TEST(IsDigitsOnlyFOREACH, test);
            TEST(IsDigitsOnlyALL, test);
            TEST(IsDigitsOnlyFOR, test);
            TEST(IsDigitsOnlyPALL, test);
            TEST(IsDigitsCharIsDigit, test);
            Console.Read();

        }

        private static void TEST(Func<string,bool> cmd,string data)
        {
            var sw = new System.Diagnostics.Stopwatch();
            sw.Start();
            for (int i = 0; i < 1000; i++)
            {
                Trace.Write(cmd.Invoke(data));
            }
            sw.Stop();
            Console.WriteLine("method:" + cmd.Method.Name + " time: " +  sw.ElapsedMilliseconds);
        }

        private static string CreateTestData()
        {
            string test = "123456677876965727625623565276863725623625362346527653836593783674567745454544276737763337367867342536578342657234657623498056062309";

            for (int i = 0; i < 12; i++)
            {
                test += test;
            }
            return test;
        }
    }
}