以前在使用VB来实现多线程的时候，发现有一定的难度。虽然也有这样那样的方法，但都不尽人意，但在C#中，要编写多线程应用程序却相当的简单。这篇文章将作简要的介绍，以起到抛砖引玉的作用！
.NET将关于多线程的功能定义在System.Threading名字空间中。因此，要使用多线程，必须先声明引用此名字空间（using System.Threading;）。
即使你没有编写多线程应用程序的经验，也可能听说过“启动线程”“杀死线程”这些词，其实除了这两个外，涉及多线程方面的还有诸如“暂停线程”“优先级”“挂起线程”“恢复线程”等等。下面将一个一个的解释。
a.启动线程
顾名思义，“启动线程”就是新建并启动一个线程的意思，如下代码可实现：
Thread thread1 = new Thread(new ThreadStart( Count));
其中的 Count 是将要被新线程执行的函数。
b.杀死线程
“杀死线程”就是将一线程斩草除根，为了不白费力气，在杀死一个线程前最好先判断它是否还活着（通过 IsAlive 属性），然后就可以调用 Abort 方法来杀死此线程。
c.暂停线程
它的意思就是让一个正在运行的线程休眠一段时间。如 thread.Sleep(1000); 就是让线程休眠1秒钟。
d.优先级
这个用不着解释了。Thread类中有一个ThreadPriority属性，它用来设置优先级，但不能保证操作系统会接受该优先级。一个线程的优先级可分为5种：Normal, AboveNormal, BelowNormal, Highest, Lowest。具体实现例子如下:
thread.Priority = ThreadPriority.Highest;
e.挂起线程
Thread类的Suspend方法用来挂起线程，知道调用Resume，此线程才可以继续执行。如果线程已经挂起，那就不会起作用。
if (thread.ThreadState = ThreadState.Running)
{
thread.Suspend();
}
f.恢复线程
用来恢复已经挂起的线程，以让它继续执行，如果线程没挂起，也不会起作用。
if (thread.ThreadState = ThreadState.Suspended)
{
thread.Resume();
}
下面将列出一个例子，以说明简单的线程处理功能。此例子来自于帮助文档。
using System;
using System.Threading;
// Simple threading scenario: Start a static method running
// on a second thread.
public class ThreadExample {
// The ThreadProc method is called when the thread starts.
// It loops ten times, writing to the console and yielding
// the rest of its time slice each time, and then ends.
public static void ThreadProc() {
for (int i = 0; i < 10; i++) {
Console.WriteLine("ThreadProc: {0}", i);
// Yield the rest of the time slice.
Thread.Sleep(0);
}
}
public static void Main() {
Console.WriteLine("Main thread: Start a second thread.");
// The constructor for the Thread class requires a ThreadStart
// delegate that represents the method to be executed on the
// thread. C# simplifies the creation of this delegate.
Thread t = new Thread(new ThreadStart(ThreadProc));
// Start ThreadProc. On a uniprocessor, the thread does not get
// any processor time until the main thread yields. Uncomment
// the Thread.Sleep that follows t.Start() to see the difference.
t.Start();
//Thread.Sleep(0);
for (int i = 0; i < 4; i++) {
Console.WriteLine("Main thread: Do some work.");
Thread.Sleep(0);
}
Console.WriteLine("Main thread: Call Join(), to wait until ThreadProc ends.");
t.Join();
Console.WriteLine("Main thread: ThreadProc.Join has returned. Press Enter to end program.");
Console.ReadLine();
}
}
此代码产生的输出类似如下内容：
Main thread: Start a second thread.
Main thread: Do some work.
ThreadProc: 0
Main thread: Do some work.
ThreadProc: 1
Main thread: Do some work.
ThreadProc: 2
Main thread: Do some work.
ThreadProc: 3
Main thread: Call Join(), to wait until ThreadProc ends.
ThreadProc: 4
ThreadProc: 5
ThreadProc: 6
ThreadProc: 7
ThreadProc: 8
ThreadProc: 9
Main thread: ThreadProc.Join has returned. Press Enter to end program
| c#中使用多线程（图） 选择自 iuhxq 的 Blog |
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Da
using System.Threading;
namespace student
{
/// <summary>
/// Form1 的摘要说明。
/// </summary>
public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.Button button1;
private System.Windows.Forms.Button button2;
private System.Windows.Forms.Button button3;
ArrayList threads = new ArrayList();
private System.Windows.Forms.ListView listView1;
private System.Windows.Forms.ColumnHeader columnHeader1;
private System.Windows.Forms.ColumnHeader columnHeader2;
/// <summary>
/// 必需的设计器变量。
/// </summary>
private System.ComponentModel.Container components = null;
public Form1()
{
//
// Windows 窗体设计器支持所必需的
//
InitializeComponent();
//
// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
//
}
/// <summary>
/// 清理所有正在使用的资源。
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
#region Windows 窗体设计器生成的代码
/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.button1 = new System.Windows.Forms.Button();
this.button2 = new System.Windows.Forms.Button();
this.button3 = new System.Windows.Forms.Button();
this.listView1 = new System.Windows.Forms.ListView();
this.columnHeader1 = new System.Windows.Forms.ColumnHeader();
this.columnHeader2 = new System.Windows.Forms.ColumnHeader();
this.SuspendLayout();
//
// button1
//
this.button1.Location = new System.Drawing.Point(24, 216);
this.button1.Name = "button1";
this.button1.TabIndex = 1;
this.button1.Text = "Add";
this.button1.Click += new System.EventHandler(this.button1_Click);
//
// button2
//
this.button2.Location = new System.Drawing.Point(104, 216);
this.button2.Name = "button2";
this.button2.TabIndex = 2;
this.button2.Text = "Del";
this.button2.Click += new System.EventHandler(this.button2_Click);
//
// button3
//
this.button3.Location = new System.Drawing.Point(184, 216);
this.button3.Name = "button3";
this.button3.TabIndex = 3;
this.button3.Text = "DelAll";
this.button3.Click += new System.EventHandler(this.button3_Click);
//
// listView1
//
this.listView1.Columns.AddRange(new System.Windows.Forms.ColumnHeader[] {
this.columnHeader1,
this.columnHeader2});
this.listView1.FullRowSelect = true;
this.listView1.GridLines = true;
this.listView1.Location = new System.Drawing.Point(0, 0);
this.listView1.Name = "listView1";
this.listView1.Size = new System.Drawing.Size(288, 208);
this.listView1.TabIndex = 5;
this.listView1.View = System.Windows.Forms.View.Details;
//
// columnHeader1
//
this.columnHeader1.Text = "线程编号";
this.columnHeader1.Width = 81;
//
// columnHeader2
//
this.columnHeader2.Text = "value";
this.columnHeader2.Width = 180;
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
this.ClientSize = new System.Drawing.Size(292, 266);
this.Controls.Add(this.listView1);
this.Controls.Add(this.button3);
this.Controls.Add(this.button2);
this.Controls.Add(this.button1);
this.Name = "Form1";
this.Text = "Form1";
this.Load += new System.EventHandler(this.Form1_Load);
this.ResumeLayout(false);
}
#endregion
/// <summary>
/// 应用程序的主入口点。
/// </summary>
[STAThread]
static void Main()
{
Application.Run(new Form1());
}
private void Form1_Load(object sender, System.EventArgs e)
{
}
private void button1_Click(object sender, System.EventArgs e)
{
Add();
}
private void button2_Click(object sender, System.EventArgs e)
{
Del();
}
private void button3_Click(object sender, System.EventArgs e)
{
while(threads.Count>0)
{
Thread t1 = (Thread)threads[0];
if(t1.IsAlive)
{
t1.Abort();
}
threads.RemoveAt(0);
lock(listView1)
{
listView1.Items.RemoveAt(0);
}
}
}
private void Add()
{
int count = threads.Count;
if(count<10)
{
Thread t = new Thread(new ThreadStart(Process));
t.Start();
threads.Add(t);
lock(listView1)
{
listView1.Items.Insert(count, new ListViewItem(new string[]{count.ToString(),"0"}));
}
}
}
private void Del()
{
int count = threads.Count;
if(count>0)
{
Thread t1 = (Thread)threads[count-1];
if(t1.IsAlive)
{
t1.Abort();
}
threads.RemoveAt(count-1);
lock(listView1)
{
listView1.Items.RemoveAt(count-1);
}
}
}
private void Process()
{
int i = 1;
while(true)
{
i++;
int j = threads.IndexOf(Thread.CurrentThread);
lock(listView1)
{
listView1.Items[j].SubItems[1].Text = i.ToString();
}
Thread.Sleep(0);
}
}
}
}
}
}
}
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