WinForm窗体多线程操作实例

最近在学习C# 多线程相关知识，这块一直比较薄弱，在网上查了一下资料，学习了一下前辈们的经验，小弟自己也比葫芦画瓢的写了一个，自学一下。

代码如下

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

namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        

        //声明线程数组1
        Thread[] thread1 = new Thread[1];

        //声明线程数组2
        Thread[] thread2 = new Thread[1];



        //声明委托，为listbox1增加Item
        delegate void AddItemMethod1(string txt);

        //声明委托，为listbox2增加Item
        delegate void AddItemMethod2(string txt);

        //利用线程为Listbox1添加内容
        private void AddItem1(string txt)
        {
            if (this.InvokeRequired)
            {
                AddItemMethod1 d = new AddItemMethod1(AddItem1);
                this.Invoke(d, new object[] { txt });
            }
            else
            {
                this.listBox1.Items.Add(txt);
            }
        }

        //利用线程为Listbox2添加内容
        private void AddItem2(string txt)
        {
            if (this.InvokeRequired)
            {
                AddItemMethod2 d = new AddItemMethod2(AddItem2);
                this.Invoke(d, new object[] { txt });
            }
            else
            {
                this.listBox2.Items.Add(txt);
            }
        }

        //生成Item
        public void GetItem1()
        {
            while (true)
            {
                AddItem1("OK");
                Thread.Sleep(1000);
            }
        }

        //生成Item
        public void GetItem2()
        {
            while (true)
            {
                AddItem2("NICE");
                Thread.Sleep(5000);
            }
        }

        private void button1_Click(object sender, EventArgs e)
        {
            ////循环创建并启动线程1
            for (int i = 0; i < thread1.Length; i++)
            {
                if (thread1[i] == null)//线程不存在
                {
                    thread1[i] = new Thread(new ThreadStart(() =>
                    {
                        while (true)
                        {
                            AddItem1("OK");
                            Thread.Sleep(1000);
                            //listbox1 的Item数量到20个是停止thread1
                            if (listBox1.Items.Count >10)
                            {

                                if (i >= thread1.Length)
                                {
                                    i = thread1.Length - 1;
                                }
                                //如果不加上面的判断，下面就会提示索引超出数组长度界限，我定义了thread1 的线程个数是1个，for循环中i为1的情况应该是进不来的，为啥
                                // 下面的i会是1？？
                                thread1[i].Abort();
                            }
                        }
                    }));
                    thread1[i].Name = i.ToString();
                    thread1[i].Start();
                }
                else
                {
                    //已经存在，如果没有运行，则启动  
                    if (thread1[i].ThreadState == ThreadState.Aborted || thread1[i].ThreadState == ThreadState.Stopped)
                    {
                        thread1[i] = new Thread(new ThreadStart(GetItem1));
                        thread1[i].Name = i.ToString();
                        thread1[i].Start();
                    }
                    else
                    {
                        thread1[i].Start();
                    }
                }
            }


            ////循环创建并启动线程2
            for (int j = 0; j < thread2.Length; j++)
            {
                if (thread2[j] == null)//线程不存在
                {
                    thread2[j] = new Thread(new ThreadStart(GetItem2));
                    thread2[j].Name = j.ToString();
                    thread2[j].Start();
                }
                else
                {
                    //已经存在，如果没有运行，则启动  
                    if (thread2[j].ThreadState == ThreadState.Aborted || thread2[j].ThreadState == ThreadState.Stopped)
                    {
                        thread2[j] = new Thread(new ThreadStart(GetItem2));
                        thread2[j].Name = j.ToString();
                        thread2[j].Start();
                    }
                    else
                    {
                        thread2[j].Start();
                    }
                }
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            //循环停止线程1执行  
            for (int i = 0; i < thread1.Length; i++)
            {
                //如果线程存在，并且状态不是停止也不是终止的，则终止该线程  
                if (thread1[i] != null && thread1[i].ThreadState != ThreadState.Stopped && thread1[i].ThreadState != ThreadState.Aborted)
                {
                    thread1[i].Abort();
                }
            }

            //循环停止线程2执行  
            for (int j = 0; j < thread2.Length; j++)
            {
                //如果线程存在，并且状态不是停止也不是终止的，则终止该线程  
                if (thread2[j] != null && thread2[j].ThreadState != ThreadState.Stopped && thread2[j].ThreadState != ThreadState.Aborted)
                {
                    thread2[j].Abort();
                }
            }
        }
    }
}