using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Diagnostics;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace TestProject
{
    public partial class TaskTEST : Form
    {
        public TaskTEST()
        {
            InitializeComponent();
        }

        private Stopwatch stopWatch = new Stopwatch();

        public void ParallelInvokeMethod1()
        {
            Parallel.For(0, 100, item =>
            {
                DoWork(item);
            });
        }

        private void DoWork(int item)
        {

        }

        public void ParallelBreak()
        {
            ConcurrentBag<int> bag = new ConcurrentBag<int>();
            stopWatch.Start();
            Parallel.For(0, 5000, (i, state) =>
            {
                if (bag.Count == 3000)
                {
                    state.Stop();
                    return;
                }
                bag.Add(i);
            });
            stopWatch.Stop();
            Console.WriteLine("Bag count is " + bag.Count + ", " + stopWatch.ElapsedMilliseconds);
        }

        public void Run1()
        {
            Thread.Sleep(2000);
            Console.WriteLine("Task 1 is cost 2 sec");
            throw new Exception("Exception in task 1");
        }
        public void Run2()
        {
            Thread.Sleep(3000);
            Console.WriteLine("Task 2 is cost 3 sec");
            throw new Exception("Exception in task 2");
        }

        public void ParallelInvokeMethod()
        {
            stopWatch.Start();
            try
            {
                Parallel.Invoke(Run1, Run2);
            }
            catch (AggregateException aex)
            {
                foreach (var ex in aex.InnerExceptions)
                {
                    Console.WriteLine(ex.Message);
                }
            }
            stopWatch.Stop();
            Console.WriteLine("Parallel run " + stopWatch.ElapsedMilliseconds + " ms.");

            stopWatch.Reset();
            stopWatch.Start();
            try
            {
                Run1();
                Run2();
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
            stopWatch.Stop();
            Console.WriteLine("Normal run " + stopWatch.ElapsedMilliseconds + " ms.");
        }


        private void Form3_Load(object sender, EventArgs e)
        {
            //var task1 = new Task(() =>
            //{
            //    Console.WriteLine("Begin");
            //    Thread.Sleep(2000);
            //    Console.WriteLine("Finish");
            //});
            //Console.WriteLine("Before start:" + task1.Status);
            //task1.Start();
            //Console.WriteLine("After start:" + task1.Status);
            //task1.Wait();
            //Console.WriteLine("After Finish:" + task1.Status);
            //Console.Read();

            //var task1 = new System.Threading.Tasks.Task(() =>
            //{
            //    Console.WriteLine("Task 1 Begin");
            //    Thread.Sleep(2000);
            //    Console.WriteLine("Task 1 Finish");
            //});
            //var task2 = new System.Threading.Tasks.Task(() =>
            //{
            //    Console.WriteLine("Task 2 Begin");
            //    Thread.Sleep(3000);
            //    Console.WriteLine("Task 2 Finish");
            //});

            //task1.Start();
            //task2.Start();
            //var result = task1.ContinueWith(task =>
            //{
            //    Console.WriteLine("task1 finished!");
            //    return "This is task result!";
            //});

            //Console.WriteLine(result.Result.ToString());

            //TaskFactory tf = new TaskFactory();
            //var SendFeedBackTask = tf.StartNew(() => { Console.WriteLine("Get some Data!"); })
            //                .ContinueWith(s => { return false; })
            //                .ContinueWith<string>(r =>
            //                {
            //                    if (r.Result)
            //                    {
            //                        return "Finished";
            //                    }
            //                    else
            //                    {
            //                        return "Error";
            //                    }
            //                });
            //Console.WriteLine(SendFeedBackTask.Result);
            //线程取消
            var tokenSource = new CancellationTokenSource();
            var token = tokenSource.Token;
            var task = new TaskFactory().StartNew(() =>
            {
                for (var i = 0; i < 1000; i++)
                {
                    Thread.Sleep(1000);
                    if (token.IsCancellationRequested)
                    {
                        Console.WriteLine("Abort mission success!");
                        return;
                    }
                    Console.WriteLine("TASK");
                }
            }, token);
            token.Register(() =>
            {
                Console.WriteLine("Canceled");
            });
            Console.WriteLine("Press enter to cancel task...");
            Thread.Sleep(10000);
            tokenSource.Cancel();
            //关联子进程
            //var pTask = new TaskFactory().StartNew(() =>
            //{
            //    var cTask = new TaskFactory().StartNew(() =>
            //    {
            //        Thread.Sleep(2000);
            //        Console.WriteLine("Childen task finished!");
            //    });
            //    Console.WriteLine("Parent task finished!");
            //});
            //pTask.Wait();
            //Console.WriteLine("Flag");
            //Console.Read();

            //加入关联关系，父Task会等子Task完成后才继续执行
            //var pTask = new TaskFactory().StartNew(() =>
            //{
            //    var cTask = new TaskFactory().StartNew(() =>
            //    {
            //        Console.WriteLine("Childen task finished!");
            //    }, TaskCreationOptions.AttachedToParent);
            //    Thread.Sleep(2000);
            //    Console.WriteLine("Parent task finished!");
            //});
            //pTask.Wait();
            //System.Threading.Tasks.Task.WaitAll();

            //Console.WriteLine("Flag");
        }
    }
}