为什么在产生线程时会出现意外输出？

Question

我试图产生一定数量的线程.但是当我向函数传递参数时,输出是随机的.它多次选择变量'i'的某些值并忽略一些.我是C#的新手.请解释我做错了什么.

using System;
using System.Threading;

public class first
{
     public static void tone(int i)
{
        Console.WriteLine("Hi ! this is thread : {0} ",i);
        Thread.Sleep(10);
}

public static void Main(String[] args)
{
    int i;
    for (i = 0; i < 10; i++)
    {
        Thread th1 = new Thread(()=>tone(i) );
        th1.Start();
       // Console.WriteLine(i);
    }
    Console.WriteLine("hey there!");
    Console.ReadLine();
}

}

Answer 1

由于关闭:

将您的代码更改为:

int i;
    for (i = 0; i < 10; i++)
    {
       int j = i;
        Thread th1 = new Thread(()=>tone(j) );
        th1.Start();
       // Console.WriteLine(i);
    }