七：初探异步编程

using System;
using System.Diagnostics;

namespace TestAsyncConsole
{
    public class NormalClass
    {
        Stopwatch sw = new Stopwatch();

        public void DoSomething()
        {
            const int largeNumber = 600000;
            sw.Start();
            int t1 = CountChar(1,largeNumber);
            int t2 = CountChar(2,largeNumber);
            LongProcess(largeNumber);
            LongProcess(largeNumber);
            LongProcess(largeNumber);
            Console.WriteLine("1: {0}",t1);
            Console.WriteLine("2: {0}",t2);
        }

        private int CountChar(int id,int Number)
        {
            int Total = 0;
            Console.WriteLine("开始调用{0} :{1,4} ms",id,sw.Elapsed.TotalMilliseconds);
            for (int i = 0; i < Number;i++ )
            {
                Total += i;
            }
            Console.WriteLine("结束调用{0} :{1,4} ms",id,sw.Elapsed.TotalMilliseconds);
            return Total;
        }

        private void LongProcess(int largeNumber)
        {
            for(int i=0;i<largeNumber;i++)
            {
            }
            Console.WriteLine("  时长: {0,4} 毫秒",sw.Elapsed.TotalMilliseconds);
        }
    }
}

    class Program
    {
        static void Main(string[] args)
        {
            NormalClass normal = new NormalClass();
            normal.DoSomething();
            Console.ReadLine();
        }
    }
}

using System;
using System.Diagnostics;
using System.Threading.Tasks;

namespace TestAsyncConsole
{
    public class AsyncClass
    {
        Stopwatch sw = new Stopwatch();

        public void DoSomething()
        {
            const int largeNumber = 600000;
            sw.Start();
            var t1 = CountChar(1, largeNumber);
            var t2 = CountChar(2, largeNumber);
            LongProcess(largeNumber);
            LongProcess(largeNumber);
            LongProcess(largeNumber);
            Console.WriteLine("1: {0}", t1.Result);
            Console.WriteLine("2: {0}", t2.Result);
        }

        private async Task<int> CountChar(int id, int Number)
        {
            int Total = 0;
            Console.WriteLine("开始调用{0} :{1,4} ms", id, sw.Elapsed.TotalMilliseconds);
            Total = await Task.Run(()=>
                {
                    for (int i = 0; i < Number; i++)
                    {
                        Total += i;
                    }
                    return Total;
                }
                );
            Console.WriteLine("结束调用{0} :{1,4} ms", id, sw.Elapsed.TotalMilliseconds);
            return Total;
        }

        private void LongProcess(int largeNumber)
        {
            for (int i = 0; i < largeNumber; i++)
            {
            }
            Console.WriteLine("  时长: {0,4} 毫秒", sw.Elapsed.TotalMilliseconds);
        }
    }
}