一个关于委托、事件、多线程、异步的Demo
前些天帮同事解决一个多线程与控件调用的问题，我不想去理解他那复杂的业务，于是就写了这么一个Demo。
在开发Windows程序中，委托和事件用的很多，异步在某些场合下也会用到。曾经在用Dephi开发CRM软件的时候，我师傅对我说：“掌握了委托和事件，才叫Windows程序设计入了门”。可见委托和事件在Windows程序设计中的重要，其实，在ASP.NET服务端程序设计中，委托和事件也有非常广泛的用途，合理的使用，效果非常酷。因此，掌握这些东西，是每个想在程序路上发展的程序员必学的。
代码有简单的注释，废话就不多说了，要想看效果，做成Demo运行下即可。
using
System;
using
System.Collections.Generic;
using
System.Text;
namespace
MF
{
delegate void MulDoDelegate();
class Biz1
{
public int _count = 40;
public event MulDoDelegate MulDoing;
public event MulDoDelegate MulDoed;
public void Do()
{
for (int i = 0; i < _count; i++)
{
System.Threading.Thread.Sleep(50);
OnMulDo();
}
OnMulDoed();
}
public void OnMulDo()
{
if (MulDoing != null)
MulDoing();
}
public void OnMulDoed()
{
if (MulDoed != null)
MulDoed();
}
}
class Biz2
{
public int _count = 60;
public event MulDoDelegate MulDoing;
public event MulDoDelegate MulDoed;
public void Do()
{
for (int i = 0; i < _count; i++)
{
System.Threading.Thread.Sleep(50);
OnMulDo();
}
OnMulDoed();
}
public void OnMulDo()
{
if (MulDoing != null)
MulDoing();
}
public void OnMulDoed()
{
if (MulDoed != null)
MulDoed();
}
}
}
namespace
MF
{
partial class Form2
{
/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.IContainer components = null;
/// <summary>
/// Clean up any resources being used.
/// </summary>
/// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
protected override void Dispose(bool disposing)
{
if (disposing && (components != null))
{
components.Dispose();
}
base.Dispose(disposing);
}
Windows Form Designer generated code
private System.Windows.Forms.Button button1;
}
}
/* *********************************************************
* “多线程调用方法，异步赋值到窗体中的控件”的Demo
*
* 作者：李中华
* 版权：浙江新能量科技有限公司
* 日期：2008-6-11
* *********************************************************/
using
System;
using
System.Collections.Generic;
using
System.ComponentModel;
using
System.Data;
using
System.Drawing;
using
System.Text;
using
System.Windows.Forms;
using
System.Threading;
using
System.IO;
namespace
MF
{
public partial class Form2 : Form
{
Form1 f;
//sdsklfjasdlkfjasklsdfdsfsdfsdfsd;
Thread t1;
Thread t2;
Biz1 b1;
Biz2 b2;
//进度条绑定的委托
MulDoDelegate mdd;
//业务类1操作完成后的提示的绑定的委托
MulDoDelegate mdd1_ed;
//业务类2操作完成后的提示的绑定的委托
MulDoDelegate mdd2_ed;
public Form2(Form1 f)
{
InitializeComponent();
this.f = f;
b1 = new Biz1();
b2 = new Biz2();
//业务类1的操作事件
b1.MulDoing += new MulDoDelegate(Biz_MulDoing);
//业务类2的操作事件
b2.MulDoing += new MulDoDelegate(Biz_MulDoing);
//业务类1的操作完成事件
b1.MulDoed += new MulDoDelegate(b1_MulDoed);
//业务类2的操作完成事件
b2.MulDoed += new MulDoDelegate(b2_MulDoed);
//委托绑定到方法
mdd = new MulDoDelegate(OnMdd_Add);
//委托绑定到方法
mdd1_ed = new MulDoDelegate(OnMdd1_Added);
//委托绑定到方法
mdd2_ed = new MulDoDelegate(OnMdd2_Added);
this.f.progressBar1.Minimum = 0;
this.f.progressBar1.Maximum = b1._count + b2._count;
}
void b2_MulDoed()
{
f.label1.Invoke(mdd2_ed);
}
void b1_MulDoed()
{
f.label1.Invoke(mdd1_ed);
}
void Biz_MulDoing()
{
f.progressBar1.Invoke(mdd);
}
void OnMdd_Add()
{
//激发进度条
if (f.progressBar1.Value < f.progressBar1.Maximum)
f.progressBar1.Value++;
}
void OnMdd1_Added()
{
//提示用户完成了调用
StringWriter sw = new StringWriter();
sw.WriteLine("完成了业务操作2");
f.label1.Text += sw.ToString();
//执行玩后终止线程
t1.Abort();
}
void OnMdd2_Added()
{
//提示用户完成了调用
StringWriter sw = new StringWriter();
sw.WriteLine("完成了业务操作1");
f.label1.Text += sw.ToString();
//执行玩后终止线程
t2.Abort();
}
private void button1_Click(object sender, EventArgs e)
{
this.f.progressBar1.Value = 0;
t1 = new Thread(new ThreadStart(b1.Do));
t2 = new Thread(new ThreadStart(b2.Do));
t1.Start();
t2.Start();
}
}
}
/* *********************************************************
* “多线程调用方法，异步赋值到窗体中的控件”的Demo
*
* 作者：李中华
* 版权：浙江新能量科技有限公司
* 日期：2008-6-11
* *********************************************************/
using
System;
using
System.Collections.Generic;
using
System.ComponentModel;
using
System.Data;
using
System.Drawing;
using
System.Text;
using
System.Windows.Forms;
using
System.Threading;
using
System.IO;
namespace
MF
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void 打开ToolStripMenuItem_Click(object sender, EventArgs e)
{
Form2 f = new Form2(this);
f.MdiParent = this;
f.WindowState = FormWindowState.Maximized;
f.Show();
}
}
}
namespace
MF
{
partial class Form1
{
/// <summary>
/// 必需的设计器变量。
/// </summary>
private System.ComponentModel.IContainer components = null;
/// <summary>
/// 清理所有正在使用的资源。
/// </summary>
/// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>
protected override void Dispose(bool disposing)
{
if (disposing && (components != null))
{
components.Dispose();
}
base.Dispose(disposing);
}
Windows 窗体设计器生成的代码
public System.Windows.Forms.ProgressBar progressBar1;
public System.Windows.Forms.Label label1;
private System.Windows.Forms.MenuStrip menuStrip1;
private System.Windows.Forms.ToolStripMenuItem 子窗体ToolStripMenuItem;
private System.Windows.Forms.ToolStripMenuItem 打开ToolStripMenuItem;
}
}
using
System;
using
System.Collections.Generic;
using
System.Windows.Forms;
namespace
MF
{
static class Program
{
/// <summary>
/// 应用程序的主入口点。
/// </summary>
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new Form1());
}
}
}
在开发Windows程序中，委托和事件用的很多，异步在某些场合下也会用到。曾经在用Dephi开发CRM软件的时候，我师傅对我说：“掌握了委托和事件，才叫Windows程序设计入了门”。可见委托和事件在Windows程序设计中的重要，其实，在ASP.NET服务端程序设计中，委托和事件也有非常广泛的用途，合理的使用，效果非常酷。因此，掌握这些东西，是每个想在程序路上发展的程序员必学的。
代码有简单的注释，废话就不多说了，要想看效果，做成Demo运行下即可。
using
System;
using
System.Collections.Generic;
using
System.Text;
namespace
MF
{
delegate void MulDoDelegate(); class Biz1 { public int _count = 40; public event MulDoDelegate MulDoing; public event MulDoDelegate MulDoed; public void Do() { for (int i = 0; i < _count; i++) { System.Threading.Thread.Sleep(50); OnMulDo(); } OnMulDoed(); } public void OnMulDo() { if (MulDoing != null) MulDoing(); } public void OnMulDoed() { if (MulDoed != null) MulDoed(); } } class Biz2 { public int _count = 60; public event MulDoDelegate MulDoing; public event MulDoDelegate MulDoed; public void Do() { for (int i = 0; i < _count; i++) { System.Threading.Thread.Sleep(50); OnMulDo(); } OnMulDoed(); } public void OnMulDo() { if (MulDoing != null) MulDoing(); } public void OnMulDoed() { if (MulDoed != null) MulDoed(); } }}
namespace
MF
{ partial class Form2 { /// <summary> /// Required designer variable. /// </summary> private System.ComponentModel.IContainer components = null; /// <summary> /// Clean up any resources being used. /// </summary> /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param> protected override void Dispose(bool disposing) { if (disposing && (components != null)) { components.Dispose(); } base.Dispose(disposing); } Windows Form Designer generated code private System.Windows.Forms.Button button1; }}
/* ********************************************************* * “多线程调用方法，异步赋值到窗体中的控件”的Demo * * 作者：李中华 * 版权：浙江新能量科技有限公司 * 日期：2008-6-11 * *********************************************************/
using
System;
using
System.Collections.Generic;
using
System.ComponentModel;
using
System.Data;
using
System.Drawing;
using
System.Text;
using
System.Windows.Forms;
using
System.Threading;
using
System.IO;
namespace
MF
{ public partial class Form2 : Form { Form1 f; //sdsklfjasdlkfjasklsdfdsfsdfsdfsd; Thread t1; Thread t2; Biz1 b1; Biz2 b2; //进度条绑定的委托 MulDoDelegate mdd; //业务类1操作完成后的提示的绑定的委托 MulDoDelegate mdd1_ed; //业务类2操作完成后的提示的绑定的委托 MulDoDelegate mdd2_ed; public Form2(Form1 f) { InitializeComponent(); this.f = f; b1 = new Biz1(); b2 = new Biz2(); //业务类1的操作事件 b1.MulDoing += new MulDoDelegate(Biz_MulDoing); //业务类2的操作事件 b2.MulDoing += new MulDoDelegate(Biz_MulDoing); //业务类1的操作完成事件 b1.MulDoed += new MulDoDelegate(b1_MulDoed); //业务类2的操作完成事件 b2.MulDoed += new MulDoDelegate(b2_MulDoed); //委托绑定到方法 mdd = new MulDoDelegate(OnMdd_Add); //委托绑定到方法 mdd1_ed = new MulDoDelegate(OnMdd1_Added); //委托绑定到方法 mdd2_ed = new MulDoDelegate(OnMdd2_Added); this.f.progressBar1.Minimum = 0; this.f.progressBar1.Maximum = b1._count + b2._count; } void b2_MulDoed() { f.label1.Invoke(mdd2_ed); } void b1_MulDoed() { f.label1.Invoke(mdd1_ed); } void Biz_MulDoing() { f.progressBar1.Invoke(mdd); } void OnMdd_Add() { //激发进度条 if (f.progressBar1.Value < f.progressBar1.Maximum) f.progressBar1.Value++; } void OnMdd1_Added() { //提示用户完成了调用 StringWriter sw = new StringWriter(); sw.WriteLine("完成了业务操作2"); f.label1.Text += sw.ToString(); //执行玩后终止线程 t1.Abort(); } void OnMdd2_Added() { //提示用户完成了调用 StringWriter sw = new StringWriter(); sw.WriteLine("完成了业务操作1"); f.label1.Text += sw.ToString(); //执行玩后终止线程 t2.Abort(); } private void button1_Click(object sender, EventArgs e) { this.f.progressBar1.Value = 0; t1 = new Thread(new ThreadStart(b1.Do)); t2 = new Thread(new ThreadStart(b2.Do)); t1.Start(); t2.Start(); } }}
/* ********************************************************* * “多线程调用方法，异步赋值到窗体中的控件”的Demo * * 作者：李中华 * 版权：浙江新能量科技有限公司 * 日期：2008-6-11 * *********************************************************/
using
System;
using
System.Collections.Generic;
using
System.ComponentModel;
using
System.Data;
using
System.Drawing;
using
System.Text;
using
System.Windows.Forms;
using
System.Threading;
using
System.IO;
namespace
MF
{ public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void 打开ToolStripMenuItem_Click(object sender, EventArgs e) { Form2 f = new Form2(this); f.MdiParent = this; f.WindowState = FormWindowState.Maximized; f.Show(); } }}
namespace
MF
{ partial class Form1 { /// <summary> /// 必需的设计器变量。 /// </summary> private System.ComponentModel.IContainer components = null; /// <summary> /// 清理所有正在使用的资源。 /// </summary> /// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param> protected override void Dispose(bool disposing) { if (disposing && (components != null)) { components.Dispose(); } base.Dispose(disposing); } Windows 窗体设计器生成的代码 public System.Windows.Forms.ProgressBar progressBar1; public System.Windows.Forms.Label label1; private System.Windows.Forms.MenuStrip menuStrip1; private System.Windows.Forms.ToolStripMenuItem 子窗体ToolStripMenuItem; private System.Windows.Forms.ToolStripMenuItem 打开ToolStripMenuItem; }}
using
System;
using
System.Collections.Generic;
using
System.Windows.Forms;
namespace
MF
{ static class Program { /// <summary> /// 应用程序的主入口点。 /// </summary> [STAThread] static void Main() { Application.EnableVisualStyles(); Application.SetCompatibleTextRenderingDefault(false); Application.Run(new Form1()); } }}