Thread 类

创建并控制线程,设置其优先级并获取其状态。

**命名空间:**System.Threading
**程序集:**mscorlib(在 mscorlib.dll 中)

语法

声明
<ComVisibleAttribute(True)> _
<ClassInterfaceAttribute(ClassInterfaceType.None)> _
Public NotInheritable Class Thread
    Inherits CriticalFinalizerObject
    Implements _Thread
用法
Dim instance As Thread
[ComVisibleAttribute(true)] 
[ClassInterfaceAttribute(ClassInterfaceType.None)] 
public sealed class Thread : CriticalFinalizerObject, _Thread
[ComVisibleAttribute(true)] 
[ClassInterfaceAttribute(ClassInterfaceType::None)] 
public ref class Thread sealed : public CriticalFinalizerObject, _Thread
/** @attribute ComVisibleAttribute(true) */ 
/** @attribute ClassInterfaceAttribute(ClassInterfaceType.None) */ 
public final class Thread extends CriticalFinalizerObject implements _Thread
ComVisibleAttribute(true) 
ClassInterfaceAttribute(ClassInterfaceType.None) 
public final class Thread extends CriticalFinalizerObject implements _Thread

备注

一个进程可以创建一个或多个线程以执行与该进程关联的部分程序代码。使用 ThreadStart 委托或 ParameterizedThreadStart 委托指定由线程执行的程序代码。使用 ParameterizedThreadStart 委托可以将数据传递到线程过程。

在线程存在期间,它总是处于由 ThreadState 定义的一个或多个状态中。可以为线程请求由 ThreadPriority 定义的调度优先级,但不能保证操作系统会接受该优先级。

GetHashCode 提供托管线程的标识。在线程的生存期内,无论获取该值的应用程序域如何,它都不会和任何来自其他线程的值冲突。

Note注意

操作系统 ThreadId 和托管线程没有固定关系,这是因为非托管宿主能控制托管与非托管线程之间的关系。特别是,复杂的宿主可以使用 CLR Hosting API 针对相同的操作系统线程调度很多托管线程,或者在不同的操作系统线程之间移动托管线程。

示例

下面的代码示例说明简单的线程处理功能。

Imports System
Imports System.Threading

' Simple threading scenario:  Start a Shared 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 Shared Sub ThreadProc()
        Dim i As Integer
        For i = 0 To 9
            Console.WriteLine("ThreadProc: {0}", i)
            ' Yield the rest of the time slice.
            Thread.Sleep(0)
        Next
    End Sub

    Public Shared Sub Main()
        Console.WriteLine("Main thread: Start a second thread.")
        ' The constructor for the Thread class requires a ThreadStart 
        ' delegate.  The Visual Basic AddressOf operator creates this
        ' delegate for you.
        Dim t As New Thread(AddressOf 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)

        Dim i As Integer
        For i = 1 To 4
            Console.WriteLine("Main thread: Do some work.")
            Thread.Sleep(0)
        Next

        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()
    End Sub
End Class
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();
    }
}
// [C++]
// Compile using /clr option.
using namespace System;
using namespace System::Threading;

// Simple threading scenario:  Start a Shared method running
// on a second thread.
public ref class ThreadExample
{
public:

   // 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.
   static void ThreadProc()
   {
      for ( int i = 0; i < 10; i++ )
      {
         Console::Write(  "ThreadProc: " );
         Console::WriteLine( i );
         
         // Yield the rest of the time slice.
         Thread::Sleep( 0 );

      }
   }

};

int main()
{
   Console::WriteLine( "Main thread: Start a second thread." );
   
   // Create the thread, passing a ThreadStart delegate that
   // represents the ThreadExample::ThreadProc method.  For a 
   // delegate representing a static method, no object is
   // required.
   Thread^ oThread = gcnew Thread( gcnew ThreadStart( &ThreadExample::ThreadProc ) );
   
   // Start the thread.  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.
   oThread->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." );
   oThread->Join();
   Console::WriteLine(  "Main thread: ThreadProc.Join has returned.  Press Enter to end program." );
   Console::ReadLine();
   return 0;
}
import System.*;
import 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() throws InterruptedException
    {
        for (int i = 0; i < 10; i++) {
            Console.WriteLine("ThreadProc: {0}", System.Convert.ToString(i));
            // Yield the rest of the time slice.
            Thread.sleep(0);
        }
    } //ThreadProc

    public static void main(String[] args) throws InterruptedException
    {
        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.  J# simplifies the creation of this delegate.
        System.Threading.Thread t =
            new System.Threading.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();
    } //main
} //ThreadExample

此代码产生的输出类似如下内容:

 [VB, C++, C#]
 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.

继承层次结构

System.Object
   System.Runtime.ConstrainedExecution.CriticalFinalizerObject
    System.Threading.Thread

线程安全

该类型对于多线程操作是安全的。

平台

Windows 98、Windows 2000 SP4、Windows CE、Windows Millennium Edition、Windows Mobile for Pocket PC、Windows Mobile for Smartphone、Windows Server 2003、Windows XP Media Center Edition、Windows XP Professional x64 Edition、Windows XP SP2、Windows XP Starter Edition

.NET Framework 并不是对每个平台的所有版本都提供支持。有关受支持版本的列表,请参见系统要求

版本信息

.NET Framework

受以下版本支持:2.0、1.1、1.0

.NET Compact Framework

受以下版本支持:2.0、1.0

请参见

参考

Thread 成员
System.Threading 命名空间

其他资源

线程与线程处理
使用线程和线程处理