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[];

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

         //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();
             }
         }

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

         private void button1_Click(object sender, EventArgs e)
         {
             ////循环创建并启动线程1
             for (int i = ; 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();
                             //listbox1 的Item数量到20个是停止thread1
                             if (listBox1.Items.Count >)
                             {

                                 if (i >= thread1.Length)
                                 {
                                     i = thread1.Length - ;
                                 }
                                 //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 = ; 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 = ; 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 = ; 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();
                 }
             }
         }
     }
 }