Question

我有richTextBox1和richTextBox2它将获取richTextBox1中的每一行并使用多线程显示到richTextBox2，由numericUpDown1设置的线程数。例如，我将数据粘贴到richTextBox1并在numericUpDown1中设置5个线程，它可以在从第一行到最后一行的循环中工作，但是当

ptr = list.Length

时它不会在循环和错误中断开

An unhandled exception of type 'System.IndexOutOfRangeException' occurred in Test.exe

Additional information: Index was outside the bounds of the array.

public partial class Form1 : Form
{
    bool continueThreads = false;
    int ptr = 0;
    string[] list = null;
    List<Thread> threadList = new List<Thread>();
    int finished = 0;

    public Form1()
    {
        InitializeComponent();
    }

    private void button1_Click(object sender, EventArgs e)
    {
        int n = (int)numericUpDown1.Value;
        Thread[] tl = new Thread[n + 1];
        threadList = tl.ToList();
        for (int i = 0; i <= n; i++)
        {
            threadList[i] = new Thread(new ThreadStart(getlist));
        }
        for (int i = 0; i <= n; i++)
        {
            threadList[i].Start();
        }
        richTextBox2.Text = "";
        ptr = 0;
        finished = 0;
        continueThreads = true;
        list = richTextBox1.Lines;
    }

    public void getlist()
    {
        while (continueThreads)
        {
            if (ptr < list.Length)
            {
                ptr += 1;
                string info = "";
                info += "Get " + list[ptr] + Environment.NewLine;
                Thread.Sleep(1000);
                this.Invoke(new Action(() => richTextBox2.Text += info));
            }
            else
            {
                continueThreads = false;
                break;
            }
        }
    }
}

Answer 1

问题是你检查ptr是否小于数组长度＆amp;在使用之前立即增加它。应该是

  if (ptr < list.Length-1)
  {
        ptr += 1;

或者在递增之前使用ptr。

如何在多线程c＃中退出while循环

1 个答案: