异步委托 多线程实现摇奖器 winform版

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 _08_摇奖机{ //创建六个invoke方法（控件调用的时候的委托，用来给lable控件赋值） public delegate void MyDelegate1(int num); public delegate void MyDelegate2(int num); public delegate void MyDelegate3(int num); public delegate void MyDelegate4(int num); public delegate void MyDelegate5(int num); public delegate void MyDelegate6(int num); public partial class Form1 : Form { public MyDelegate1 md1; public MyDelegate1 md2; public MyDelegate1 md3; public MyDelegate1 md4; public MyDelegate1 md5; public MyDelegate1 md6; //此委托用来作异步委托，旨在让clr自动创建另一个线程来完成主线程要做的操作，以缓解主线程的压力 public delegate void MyDelegate(bool b); public Form1() { InitializeComponent(); md1 = SetLable1; md2 = SetLable2; md3 = SetLable3; md4 = SetLable4; md5 = SetLable5; md6 = SetLable6; } //用来存放子线程对象 PRivate Thread nameThread; private int id; private void button1_Click(object sender, EventArgs e) { MyDelegate md = new MyDelegate(this.SetNumberData);; if (button1.Text.Trim()=="开始") { button1.Text = "停止"; //调用异步委托，就是在另一个线程中执行此委托绑定的方法 IAsyncResult result = md.BeginInvoke(true,null, null); } else { button1.Text = "开始"; //停止的话就相当于终止子线程 nameThread.Abort(); } //首先要想清楚 要给主线程的空间lable赋值，那么就必须是主线程干的事 //md.EndInvoke(result); }

public void SetNumberData(bool b) { while (b==true) { List<int> listNum = new List<int>(); Random random = new Random(); //随机生成6个数 while (listNum.Count <= 6) { int n = random.Next(0, 10); listNum.Add(n); } //不是创建此控件的线程调用此控件的时候就必须调用invoke方法 if (this.label1.InvokeRequired) { this.Invoke(md1, listNum[0]); } else { label1.Text = listNum[0].ToString(); } if (this.label2.InvokeRequired) { this.Invoke(md2, listNum[1]); } else { label2.Text = listNum[1].ToString(); } if (this.label3.InvokeRequired) { this.Invoke(md3, listNum[2]); } else { label3.Text = listNum[2].ToString(); } if (this.label4.InvokeRequired) { this.Invoke(md4, listNum[3]); } else { label4.Text = listNum[3].ToString(); } if (this.label5.InvokeRequired) { this.Invoke(md5, listNum[4]); } else { label5.Text = listNum[4].ToString(); } if (this.label6.InvokeRequired) { this.Invoke(md6, listNum[5]); } else { label6.Text = listNum[5].ToString(); } //记录下当前的线程对象，以便于在点击停止按钮的时候终止此线程 nameThread = Thread.CurrentThread; Thread.Sleep(300); } //id=Thread.CurrentThread.ManagedThreadId; }

public void SetLable1(int n) { label1.Text = n.ToString(); } public void SetLable2(int n) { label2.Text = n.ToString(); } public void SetLable3(int n) { label3.Text = n.ToString(); } public void SetLable4(int n) { label4.Text = n.ToString(); } public void SetLable5(int n) { label5.Text = n.ToString(); } public void SetLable6(int n) { label6.Text = n.ToString(); } }}