测试Parallel的返回值，怎么不不执行下面的代码？

joyoes

form1中的代码是这样的：

[C#] 纯文本查看 复制代码

private void button2_Click(object sender, EventArgs e)
        {
           Scan s=new Scan(this);
            s.RunTask();
        }

Scan类中的代码是这样的：

[C#] 纯文本查看 复制代码

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

namespace WinFormsApp1
{
    public class Scan
    {

        private Form1 frm;
/// <summary>
        /// 线程最大总数
        /// </summary>
        private int thread_num = 20;

        public Scan(Form1 form,int threadNum=20)
        {
            this.frm = form;
            this.thread_num = threadNum;
        }

        public void RunTask()
        {

            #region 初始化数据
            int[][] dirsArray = new int[100][];
            for (int i = 0; i < 100; i++)
            {
                int[] innerArray = new int[i];
                for (int j = 0; j < i; j++)
                {
                    innerArray[j] = i;
                }
                dirsArray[i] = innerArray;
            }
            #endregion
            Task.Run(() =>
            {
                Debug.WriteLine($"当前线程CurrentThreadId={Thread.CurrentThread.ManagedThreadId}");
                //1.从数据库中获取数据

                //设置线程数
                if (dirsArray.Length<this.thread_num)
                {
                    this.thread_num = dirsArray.Length;
                }
                ParallelOptions parallelOptions = new ParallelOptions()
                {
                    MaxDegreeOfParallelism = this.thread_num
                };
                ParallelLoopResult result = Parallel.ForEach(dirsArray, parallelOptions, currentTypeArray =>
                {
                    Debug.WriteLine($"CurrentThreadId={Thread.CurrentThread.ManagedThreadId},执行{string.Join(", ", currentTypeArray)}");
                    //this.frm.Func(string.Join(", ", currentTypeArray));                    
                    foreach (var num in currentTypeArray)
                    {
                        Thread.Sleep(1);
                    }
                });
                while (result.IsCompleted)
                {
                    Console.WriteLine("是否完成:{0}", result.IsCompleted);
                    Console.WriteLine("最低迭代:{0}", result.LowestBreakIteration);
                    break;
                }
            });
            Console.WriteLine("数据跑完啦！");
        }
    }
}

但执行的结果却不显示执行完的情况：

当执行完所有的线程后，并没有出现：
true
数据跑完啦！
等预想的输出结果，这是怎么回事啊？请大神帮忙解决下，谢谢！

站长苏飞

线程就没有执行到这一步吧，你处理一下异常看是不是中间报错了