Question

我是新手，我在c＃中有多线程实现。但是结果返回错误。文件的编号为0到1000。但是返回值为1到1000。不是0。请帮助我理解问题。谢谢。

static void Number(int number)
{
    List<string> l_number = new List<string>(File.ReadAllLines("number.txt"));
    Console.WriteLine(l_number[number]);
}

static void Main(string[] args)
{
    List<Thread> l_thread = new List<Thread>();
    int soThread = 10;

    Thread thread1 = new Thread(delegate ()
    {
        var numnum = 0;
        while (true)
        {
            for (int i = 0; i < soThread; i++)
            {
                Thread threadnew = new Thread(delegate ()
                {
                    //Console.WriteLine(numnum);
                    Number(numnum);
                });
                threadnew.Start();
                l_thread.Add(threadnew);
                numnum++;
                Thread.Sleep(100);
            }
            foreach (Thread item in l_thread)
            {
                item.Join();
            }
        }
    });

Answer 1

您正在捕获 numnum-它不是每个线程的，而计时意味着它不是被捕获时的值-它是在捕获时的值线程已计划的时间；尝试改为按作用域创建变量的副本，即

for (int i = 0; i < soThread; i++)
{
    int copy = numnum;
    Thread threadnew = new Thread(delegate ()
    {
        //Console.WriteLine(copy);
        Number(copy);
    });

    // ...
}

多线程C＃：不按预期返回结果

1 个答案: