并行化LINQ查询

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

namespace Test
{
    class Program
    {
        public static string DateTime_Now_ToString()
        {
            return DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss");
        }


        /// <summary>
        /// 并行化LINQ查询
        /// </summary>
        static void Main()
        {
            var list = GetTypes();


            Console.WriteLine();
            Console.WriteLine(DateTime_Now_ToString());

            Stopwatch sw = new Stopwatch();

            sw.Start();
            var query = from t in list
                        select WorkProcessing(t);//耗时循环

            Console.WriteLine(query.Count().ToString());
            foreach (var item in query)
            {
                //线程Id：9, 线程池：False, 后台线程：False
                PrintInfo(item);
            }

            sw.Stop();
            Console.WriteLine("LINQ耗时：{0},计时：{1}", sw.ElapsedMilliseconds.ToString(), sw.ElapsedTicks.ToString());


            Console.WriteLine();
            Console.WriteLine(DateTime_Now_ToString());
            sw.Reset(); sw.Start();
            var parallelQuery = from t in ParallelEnumerable.AsParallel(list)
                                select WorkProcessing(t);

            Console.WriteLine(parallelQuery.Count().ToString());
            foreach (var item in parallelQuery)
            {
                //线程Id：9, 线程池：False, 后台线程：False
                PrintInfo(item);
            }
            sw.Stop();
            Console.WriteLine("ParallelEnumerable.AsParallel()耗时：{0},计时：{1}", sw.ElapsedMilliseconds.ToString(), sw.ElapsedTicks.ToString());



            Console.WriteLine();
            Console.WriteLine(DateTime_Now_ToString());
            sw.Reset(); sw.Start();
            var parallelQuery2 = from t in list.AsParallel()
                                 select WorkProcessing(t);

            Console.WriteLine(parallelQuery2.Count().ToString());
            parallelQuery2.ForAll(PrintInfo);
            //线程Id：12, 线程池：True, 后台线程：True
            sw.Stop();
            Console.WriteLine("AsParallel()耗时：{0},计时：{1}", sw.ElapsedMilliseconds.ToString(), sw.ElapsedTicks.ToString());


            Console.WriteLine();
            Console.WriteLine(DateTime_Now_ToString());
            sw.Reset(); sw.Start();
            var query2 = from t in list.AsParallel().AsSequential()
                         select WorkProcessing(t);

            Console.WriteLine(query2.Count().ToString());
            foreach (var item in query2)
            {
                //线程Id：9, 线程池：False, 后台线程：False
                PrintInfo(item);
            }
            sw.Stop();
            Console.WriteLine("AsParallel().AsSequential()耗时：{0},计时：{1}", sw.ElapsedMilliseconds.ToString(), sw.ElapsedTicks.ToString());



            Console.WriteLine("\n执行完成" + DateTime_Now_ToString());
            Console.ReadLine();
        }

        private static void PrintInfo(string typeName)
        {
            Thread.Sleep(TimeSpan.FromMilliseconds(100));
        }

        private static string WorkProcessing(string typeName)
        {
            Thread.Sleep(TimeSpan.FromMilliseconds(100));

            return typeName;
        }

        private static IEnumerable<string> GetTypes()
        {
            string str = "xmlsch"; //"xmlschemaobject";
            var result = from assembly in AppDomain.CurrentDomain.GetAssemblies()
                         from type in assembly.GetExportedTypes()
                         where type.Name.StartsWith(str, StringComparison.CurrentCultureIgnoreCase)
                         select type.Name;

            return result;
        }
    }
}

/*

2016-08-30 11:46:54
85
LINQ耗时：25548,计时：59746259

2016-08-30 11:47:20
85
ParallelEnumerable.AsParallel()耗时：12843,计时：30035306

2016-08-30 11:47:33
85
AsParallel()耗时：6648,计时：15547847

2016-08-30 11:47:39
85
AsParallel().AsSequential()耗时：25550,计时：59749639

执行完成2016-08-30 11:48:05

*/