WaitHandle.WaitAll WaitHandle.WaitAll WaitHandle.WaitAll WaitHandle.WaitAll Method

定义

等待指定数组中的所有元素都收到信号。Waits for all the elements in the specified array to receive a signal.

重载

WaitAll(WaitHandle[], TimeSpan, Boolean) WaitAll(WaitHandle[], TimeSpan, Boolean) WaitAll(WaitHandle[], TimeSpan, Boolean) WaitAll(WaitHandle[], TimeSpan, Boolean)

等待指定数组中的所有元素收到信号,使用 TimeSpan 值指定时间间隔,并指定是否在等待之前退出同步域。Waits for all the elements in the specified array to receive a signal, using a TimeSpan value to specify the time interval, and specifying whether to exit the synchronization domain before the wait.

WaitAll(WaitHandle[], Int32, Boolean) WaitAll(WaitHandle[], Int32, Boolean) WaitAll(WaitHandle[], Int32, Boolean) WaitAll(WaitHandle[], Int32, Boolean)

等待指定数组中的所有元素收到信号,使用 Int32 值指定时间间隔,并指定是否在等待之前退出同步域。Waits for all the elements in the specified array to receive a signal, using an Int32 value to specify the time interval and specifying whether to exit the synchronization domain before the wait.

WaitAll(WaitHandle[], TimeSpan) WaitAll(WaitHandle[], TimeSpan) WaitAll(WaitHandle[], TimeSpan) WaitAll(WaitHandle[], TimeSpan)

等待指定数组中的所有元素接收信号,同时使用 TimeSpan 值指定时间间隔。Waits for all the elements in the specified array to receive a signal, using a TimeSpan value to specify the time interval.

WaitAll(WaitHandle[], Int32) WaitAll(WaitHandle[], Int32) WaitAll(WaitHandle[], Int32) WaitAll(WaitHandle[], Int32)

等待指定数组中的所有元素接收信号,同时使用 Int32 值指定时间间隔。Waits for all the elements in the specified array to receive a signal, using an Int32 value to specify the time interval.

WaitAll(WaitHandle[]) WaitAll(WaitHandle[]) WaitAll(WaitHandle[]) WaitAll(WaitHandle[])

等待指定数组中的所有元素都收到信号。Waits for all the elements in the specified array to receive a signal.

WaitAll(WaitHandle[], TimeSpan, Boolean) WaitAll(WaitHandle[], TimeSpan, Boolean) WaitAll(WaitHandle[], TimeSpan, Boolean) WaitAll(WaitHandle[], TimeSpan, Boolean)

等待指定数组中的所有元素收到信号,使用 TimeSpan 值指定时间间隔,并指定是否在等待之前退出同步域。Waits for all the elements in the specified array to receive a signal, using a TimeSpan value to specify the time interval, and specifying whether to exit the synchronization domain before the wait.

public:
 static bool WaitAll(cli::array <System::Threading::WaitHandle ^> ^ waitHandles, TimeSpan timeout, bool exitContext);
public static bool WaitAll (System.Threading.WaitHandle[] waitHandles, TimeSpan timeout, bool exitContext);
static member WaitAll : System.Threading.WaitHandle[] * TimeSpan * bool -> bool
Public Shared Function WaitAll (waitHandles As WaitHandle(), timeout As TimeSpan, exitContext As Boolean) As Boolean

参数

waitHandles
WaitHandle[]

一个 WaitHandle 数组,包含当前实例将等待的对象。A WaitHandle array containing the objects for which the current instance will wait. 此数组不能包含对同一对象的多个引用。This array cannot contain multiple references to the same object.

timeout
TimeSpan TimeSpan TimeSpan TimeSpan

表示等待毫秒数的 TimeSpan,或表示 -1 毫秒(无限期等待)的 TimeSpanA TimeSpan that represents the number of milliseconds to wait, or a TimeSpan that represents -1 milliseconds, to wait indefinitely.

exitContext
Boolean Boolean Boolean Boolean

如果等待之前先退出上下文的同步域(如果在同步上下文中),并在稍后重新获取它,则为 true;否则为 falsetrue to exit the synchronization domain for the context before the wait (if in a synchronized context), and reacquire it afterward; otherwise, false.

返回

如果 waitHandles 中的每个元素都收到信号,则为 true;否则为 falsetrue when every element in waitHandles has received a signal; otherwise false.

异常

waitHandles 参数为 nullThe waitHandles parameter is null.

- 或 --or- waitHandles 数组中一个或多个对象为 nullOne or more of the objects in the waitHandles array is null.

-or- waitHandles 为不具有元素的数组且 .NET Framework 版本为 2.0 或更高版本。waitHandles is an array with no elements and the .NET Framework version is 2.0 or later.

waitHandles 数组包含重复的元素。The waitHandles array contains elements that are duplicates.

waitHandles 中的对象数大于系统允许的数量。The number of objects in waitHandles is greater than the system permits.

-or- STAThreadAttribute 属性应用于当前线程的线程过程且 waitHandles 包含多个元素。The STAThreadAttribute attribute is applied to the thread procedure for the current thread, and waitHandles contains more than one element.

waitHandles 数组不含任何元素,并且 .NET Framework 版本为 1.0 或 1.1。waitHandles is an array with no elements and the .NET Framework version is 1.0 or 1.1.

timeout 为 -1 毫秒以外的负数,表示无限期超时。timeout is a negative number other than -1 milliseconds, which represents an infinite time-out. - 或 --or- timeout 大于 MaxValuetimeout is greater than MaxValue.

等待终止,因为线程在未释放互斥的情况下退出。The wait terminated because a thread exited without releasing a mutex. 在 Windows 98 或 Windows Millennium Edition 上不会引发此异常。This exception is not thrown on Windows 98 or Windows Millennium Edition.

waitHandles 数组包含其他应用程序域中 WaitHandle 的透明代理。The waitHandles array contains a transparent proxy for a WaitHandle in another application domain.

示例

下面的代码示例演示如何使用线程池异步创建和写入一组文件。The following code example shows how to use the thread pool to asynchronously create and write to a group of files. 每个写入操作都作为工作项排队,并在完成后发出信号。Each write operation is queued as a work item and signals when it is finished. 主线程等待所有项发出信号,然后退出。The main thread waits for all the items to signal and then exits.

using namespace System;
using namespace System::IO;
using namespace System::Security::Permissions;
using namespace System::Threading;

// Maintain state to pass to WriteToFile.
ref class State
{
public:
   String^ fileName;
   array<Byte>^byteArray;
   ManualResetEvent^ manualEvent;
   State( String^ fileName, array<Byte>^byteArray, ManualResetEvent^ manualEvent )
      : fileName( fileName ), byteArray( byteArray ), manualEvent( manualEvent )
   {}

};

ref class Writer
{
private:
   static int workItemCount = 0;
   Writer(){}


public:
   static void WriteToFile( Object^ state )
   {
      int workItemNumber = workItemCount;
      Interlocked::Increment( workItemCount );
      Console::WriteLine( "Starting work item {0}.", workItemNumber.ToString() );
      State^ stateInfo = dynamic_cast<State^>(state);
      FileStream^ fileWriter;
      
      // Create and write to the file.
      try
      {
         fileWriter = gcnew FileStream( stateInfo->fileName,FileMode::Create );
         fileWriter->Write( stateInfo->byteArray, 0, stateInfo->byteArray->Length );
      }
      finally
      {
         if ( fileWriter != nullptr )
         {
            fileWriter->Close();
         }
         
         // Signal main() that the work item has finished.
         Console::WriteLine( "Ending work item {0}.", workItemNumber.ToString() );
         stateInfo->manualEvent->Set();
      }

   }

};

int main()
{
   const int numberOfFiles = 5;
   String^ dirName =  "C:\\TestTest";
   String^ fileName;
   array<Byte>^byteArray;
   Random^ randomGenerator = gcnew Random;
   array<ManualResetEvent^>^manualEvents = gcnew array<ManualResetEvent^>(numberOfFiles);
   State^ stateInfo;
   if (  !Directory::Exists( dirName ) )
   {
      Directory::CreateDirectory( dirName );
   }

   
   // Queue the work items that create and write to the files.
   for ( int i = 0; i < numberOfFiles; i++ )
   {
      fileName = String::Concat( dirName,  "\\Test", ((i)).ToString(),  ".dat" );
      
      // Create random data to write to the file.
      byteArray = gcnew array<Byte>(1000000);
      randomGenerator->NextBytes( byteArray );
      manualEvents[ i ] = gcnew ManualResetEvent( false );
      stateInfo = gcnew State( fileName,byteArray,manualEvents[ i ] );
      ThreadPool::QueueUserWorkItem( gcnew WaitCallback( &Writer::WriteToFile ), stateInfo );

   }
   
   // Since ThreadPool threads are background threads, 
   // wait for the work items to signal before exiting.
   if ( WaitHandle::WaitAll( manualEvents, TimeSpan(0,0,5), false ) )
   {
      Console::WriteLine( "Files written - main exiting." );
   }
   else
   {
      
      // The wait operation times out.
      Console::WriteLine( "Error writing files - main exiting." );
   }
}

using System;
using System.IO;
using System.Security.Permissions;
using System.Threading;

class Test
{
    static void Main()
    {
        const int numberOfFiles = 5;
        string dirName = @"C:\TestTest";
        string fileName;

        byte[] byteArray;
        Random randomGenerator = new Random();

        ManualResetEvent[] manualEvents = 
            new ManualResetEvent[numberOfFiles];
        State stateInfo;

        if(!Directory.Exists(dirName))
        {
            Directory.CreateDirectory(dirName);
        }

        // Queue the work items that create and write to the files.
        for(int i = 0; i < numberOfFiles; i++)
        {
            fileName = string.Concat(
                dirName, @"\Test", i.ToString(), ".dat");

            // Create random data to write to the file.
            byteArray = new byte[1000000];
            randomGenerator.NextBytes(byteArray);

            manualEvents[i] = new ManualResetEvent(false);

            stateInfo = 
                new State(fileName, byteArray, manualEvents[i]);

            ThreadPool.QueueUserWorkItem(new WaitCallback(
                Writer.WriteToFile), stateInfo);
        }
    
        // Since ThreadPool threads are background threads, 
        // wait for the work items to signal before exiting.
        if(WaitHandle.WaitAll(
            manualEvents, new TimeSpan(0, 0, 5), false))
        {
            Console.WriteLine("Files written - main exiting.");
        }
        else
        {
            // The wait operation times out.
            Console.WriteLine("Error writing files - main exiting.");
        }
    }
}

// Maintain state to pass to WriteToFile.
class State
{
    public string fileName;
    public byte[] byteArray;
    public ManualResetEvent manualEvent;

    public State(string fileName, byte[] byteArray, 
        ManualResetEvent manualEvent)
    {
        this.fileName = fileName;
        this.byteArray = byteArray;
        this.manualEvent = manualEvent;
    }
}

class Writer
{
    static int workItemCount = 0;
    Writer() {}

    public static void WriteToFile(object state)
    {
        int workItemNumber = workItemCount;
        Interlocked.Increment(ref workItemCount);
        Console.WriteLine("Starting work item {0}.",
            workItemNumber.ToString());
        State stateInfo = (State)state;
        FileStream fileWriter = null;

        // Create and write to the file.
        try
        {
            fileWriter = new FileStream(
                stateInfo.fileName, FileMode.Create);
            fileWriter.Write(stateInfo.byteArray, 
                0, stateInfo.byteArray.Length);
        }
        finally
        {
            if(fileWriter != null)
            {
                fileWriter.Close();
            }

            // Signal Main that the work item has finished.
            Console.WriteLine("Ending work item {0}.", 
                workItemNumber.ToString());
            stateInfo.manualEvent.Set();
        }
    }
}
Imports System.IO
Imports System.Security.Permissions
Imports System.Threading

Public Class Test

    ' WaitHandle.WaitAll requires a multithreaded apartment 
    ' when using multiple wait handles.
    <MTAThreadAttribute> _
    Shared Sub Main()
        Const numberOfFiles As Integer = 5
        Dim dirName As String = "C:\TestTest"
        Dim fileName As String 

        Dim byteArray() As Byte 
        Dim randomGenerator As New Random()

        Dim manualEvents(numberOfFiles - 1) As ManualResetEvent
        Dim stateInfo As State 

        If Directory.Exists(dirName) <> True Then
            Directory.CreateDirectory(dirName)
        End If

        ' Queue the work items that create and write to the files.
        For i As Integer = 0 To numberOfFiles - 1
            fileName = String.Concat( _
                dirName, "\Test", i.ToString(), ".dat")

            ' Create random data to write to the file.
            byteArray = New Byte(1000000){}
            randomGenerator.NextBytes(byteArray)

            manualEvents(i) = New ManualResetEvent(false)

            stateInfo = _ 
                New State(fileName, byteArray, manualEvents(i))

            ThreadPool.QueueUserWorkItem(AddressOf _
                Writer.WriteToFile, stateInfo)
        Next i
    
        ' Since ThreadPool threads are background threads, 
        ' wait for the work items to signal before exiting.
        If WaitHandle.WaitAll( _
            manualEvents, New TimeSpan(0, 0, 5), false) = True  Then

            Console.WriteLine("Files written - main exiting.")
        Else
        
            ' The wait operation times out.
            Console.WriteLine("Error writing files - main exiting.")
        End If
    End Sub

End Class
 
' Maintain state to pass to WriteToFile.
Public Class State

    Public fileName As String
    Public byteArray As Byte()
    Public manualEvent As ManualResetEvent

    Sub New(fileName As String, byteArray() As Byte, _
        manualEvent As ManualResetEvent)
    
        Me.fileName = fileName
        Me.byteArray = byteArray
        Me.manualEvent = manualEvent
    End Sub

End Class

Public Class Writer

    Private Sub New()
    End Sub

    Shared workItemCount As Integer = 0

    Shared Sub WriteToFile(state As Object)
        Dim workItemNumber As Integer = workItemCount
        Interlocked.Increment(workItemCount)
        Console.WriteLine("Starting work item {0}.", _
            workItemNumber.ToString())
        Dim stateInfo As State = CType(state, State)
        Dim fileWriter As FileStream = Nothing

        ' Create and write to the file.
        Try
            fileWriter = New FileStream( _
                stateInfo.fileName, FileMode.Create)
            fileWriter.Write(stateInfo.byteArray, _
                0, stateInfo.byteArray.Length)
        Finally
            If Not fileWriter Is Nothing Then
                fileWriter.Close()
            End If

            ' Signal Main that the work item has finished.
            Console.WriteLine("Ending work item {0}.", _
                workItemNumber.ToString())
            stateInfo.manualEvent.Set()
        End Try
    End Sub

End Class

注解

如果 @no__t 为零,则该方法不会阻止。If timeout is zero, the method does not block. 它将测试等待句柄的状态并立即返回。It tests the state of the wait handles and returns immediately.

AbandonedMutexException .NET Framework 版本2.0 中的新版本。AbandonedMutexException is new in the .NET Framework version 2.0. 在以前的版本中,在放弃互斥体时,@no__t 0 方法返回 trueIn previous versions, the WaitAll method returns true when a mutex is abandoned. 被放弃的 mutex 通常表明出现了严重的编码错误。An abandoned mutex often indicates a serious coding error. 对于系统范围内的互斥体,它可能指示应用程序突然终止(例如,使用 Windows 任务管理器)。In the case of a system-wide mutex, it might indicate that an application has been terminated abruptly (for example, by using Windows Task Manager). 此异常包含用于调试的信息。The exception contains information useful for debugging.

当等待终止时,WaitAll 方法返回,这意味着所有句柄都已发出信号或发生超时。The WaitAll method returns when the wait terminates, which means either all the handles are signaled or a time-out occurs. 在某些实现中,如果传递的句柄超过64,则会引发 NotSupportedExceptionOn some implementations, if more than 64 handles are passed, a NotSupportedException is thrown. 如果数组包含重复项,则调用将失败。If the array contains duplicates, the call will fail.

备注

@No__t 为1的线程不支持 @no__t 0 方法。The WaitAll method is not supported on threads that have STAThreadAttribute.

@No__t 的最大值为-0 @no__t。The maximum value for timeout is Int32.MaxValue.

有关退出上下文的说明Notes on Exiting the Context

除非在非默认托管上下文内调用了 WaitAll 方法,否则 @no__t 参数不起作用。The exitContext parameter has no effect unless the WaitAll method is called from inside a nondefault managed context. 如果您的线程位于从 ContextBoundObject 派生的类的实例中,则会发生这种情况。This can happen if your thread is inside a call to an instance of a class derived from ContextBoundObject. 即使当前正在对不是从 ContextBoundObject 派生的类执行方法,如 String,如果在当前应用程序域中的堆栈上 @no__t,则可以在非默认上下文中。Even if you are currently executing a method on a class that is not derived from ContextBoundObject, like String, you can be in a nondefault context if a ContextBoundObject is on your stack in the current application domain.

当代码在非默认上下文中执行时,为 @no__t 指定 true 会导致线程在执行 @no__t 2 方法之前退出非默认的托管上下文(即转换到默认上下文)。When your code is executing in a nondefault context, specifying true for exitContext causes the thread to exit the nondefault managed context (that is, to transition to the default context) before executing the WaitAll method. 在对 WaitAll 方法的调用完成后,它将返回到原始的非默认上下文。It returns to the original nondefault context after the call to the WaitAll method completes.

当上下文绑定类 @no__t 为0时,这会很有用。This can be useful when the context-bound class has SynchronizationAttribute. 在这种情况下,对类成员的所有调用都将自动同步,同步域是类的整个代码正文。In that case, all calls to members of the class are automatically synchronized, and the synchronization domain is the entire body of code for the class. 如果成员的调用堆栈中的代码调用 WaitAll 方法并指定 exitContext @no__t,则线程将退出同步域,从而允许在对对象的任何成员的调用上被阻止的线程继续。If code in the call stack of a member calls the WaitAll method and specifies true for exitContext, the thread exits the synchronization domain, allowing a thread that is blocked on a call to any member of the object to proceed. WaitAll 方法返回时,进行调用的线程必须等待重新进入同步域。When the WaitAll method returns, the thread that made the call must wait to reenter the synchronization domain.

WaitAll(WaitHandle[], Int32, Boolean) WaitAll(WaitHandle[], Int32, Boolean) WaitAll(WaitHandle[], Int32, Boolean) WaitAll(WaitHandle[], Int32, Boolean)

等待指定数组中的所有元素收到信号,使用 Int32 值指定时间间隔,并指定是否在等待之前退出同步域。Waits for all the elements in the specified array to receive a signal, using an Int32 value to specify the time interval and specifying whether to exit the synchronization domain before the wait.

public:
 static bool WaitAll(cli::array <System::Threading::WaitHandle ^> ^ waitHandles, int millisecondsTimeout, bool exitContext);
public static bool WaitAll (System.Threading.WaitHandle[] waitHandles, int millisecondsTimeout, bool exitContext);
static member WaitAll : System.Threading.WaitHandle[] * int * bool -> bool
Public Shared Function WaitAll (waitHandles As WaitHandle(), millisecondsTimeout As Integer, exitContext As Boolean) As Boolean

参数

waitHandles
WaitHandle[]

一个 WaitHandle 数组,包含当前实例将等待的对象。A WaitHandle array containing the objects for which the current instance will wait. 此数组不能包含对同一对象的多个引用(重复的元素)。This array cannot contain multiple references to the same object (duplicates).

millisecondsTimeout
Int32 Int32 Int32 Int32

等待的毫秒数,或为 Infinite (-1),表示无限期等待。The number of milliseconds to wait, or Infinite (-1) to wait indefinitely.

exitContext
Boolean Boolean Boolean Boolean

如果等待之前先退出上下文的同步域(如果在同步上下文中),并在稍后重新获取它,则为 true;否则为 falsetrue to exit the synchronization domain for the context before the wait (if in a synchronized context), and reacquire it afterward; otherwise, false.

返回

如果 waitHandles 中的每个元素都已收到信号,则为 true;否则为 falsetrue when every element in waitHandles has received a signal; otherwise, false.

异常

waitHandles 参数为 nullThe waitHandles parameter is null.

-or- waitHandles 数组中一个或多个对象为 nullOne or more of the objects in the waitHandles array is null.

-or- waitHandles 为不具有元素的数组且 .NET Framework 版本为 2.0 或更高版本。waitHandles is an array with no elements and the .NET Framework version is 2.0 or later.

waitHandles 数组包含重复的元素。The waitHandles array contains elements that are duplicates.

waitHandles 中的对象数大于系统允许的数量。The number of objects in waitHandles is greater than the system permits.

- 或 --or- STAThreadAttribute 属性应用于当前线程的线程过程且 waitHandles 包含多个元素。The STAThreadAttribute attribute is applied to the thread procedure for the current thread, and waitHandles contains more than one element.

waitHandles 数组不含任何元素,并且 .NET Framework 版本为 1.0 或 1.1。waitHandles is an array with no elements and the .NET Framework version is 1.0 or 1.1.

millisecondsTimeout 是一个非 -1 的负数,而 -1 表示无限期超时。millisecondsTimeout is a negative number other than -1, which represents an infinite time-out.

等待结束,因为线程在未释放互斥的情况下退出。The wait completed because a thread exited without releasing a mutex. 在 Windows 98 或 Windows Millennium Edition 上不会引发此异常。This exception is not thrown on Windows 98 or Windows Millennium Edition.

waitHandles 数组包含其他应用程序域中 WaitHandle 的透明代理。The waitHandles array contains a transparent proxy for a WaitHandle in another application domain.

示例

下面的代码示例演示如何使用线程池异步创建和写入一组文件。The following code example shows how to use the thread pool to asynchronously create and write to a group of files. 每个写入操作都作为工作项排队,并在完成后发出信号。Each write operation is queued as a work item and signals when it is finished. 主线程等待所有项发出信号,然后退出。The main thread waits for all the items to signal and then exits.

using namespace System;
using namespace System::IO;
using namespace System::Security::Permissions;
using namespace System::Threading;

// Maintain state to pass to WriteToFile.
ref class State
{
public:
   String^ fileName;
   array<Byte>^byteArray;
   ManualResetEvent^ manualEvent;
   State( String^ fileName, array<Byte>^byteArray, ManualResetEvent^ manualEvent )
      : fileName( fileName ), byteArray( byteArray ), manualEvent( manualEvent )
   {}

};

ref class Writer
{
private:
   static int workItemCount = 0;
   Writer(){}


public:
   static void WriteToFile( Object^ state )
   {
      int workItemNumber = workItemCount;
      Interlocked::Increment( workItemCount );
      Console::WriteLine( "Starting work item {0}.", workItemNumber.ToString() );
      State^ stateInfo = dynamic_cast<State^>(state);
      FileStream^ fileWriter;
      
      // Create and write to the file.
      try
      {
         fileWriter = gcnew FileStream( stateInfo->fileName,FileMode::Create );
         fileWriter->Write( stateInfo->byteArray, 0, stateInfo->byteArray->Length );
      }
      finally
      {
         if ( fileWriter != nullptr )
         {
            fileWriter->Close();
         }
         
         // Signal main() that the work item has finished.
         Console::WriteLine( "Ending work item {0}.", workItemNumber.ToString() );
         stateInfo->manualEvent->Set();
      }

   }

};

int main()
{
   const int numberOfFiles = 5;
   String^ dirName =  "C:\\TestTest";
   String^ fileName;
   array<Byte>^byteArray;
   Random^ randomGenerator = gcnew Random;
   array<ManualResetEvent^>^manualEvents = gcnew array<ManualResetEvent^>(numberOfFiles);
   State^ stateInfo;
   if (  !Directory::Exists( dirName ) )
   {
      Directory::CreateDirectory( dirName );
   }

   
   // Queue the work items that create and write to the files.
   for ( int i = 0; i < numberOfFiles; i++ )
   {
      fileName = String::Concat( dirName,  "\\Test", ((i)).ToString(),  ".dat" );
      
      // Create random data to write to the file.
      byteArray = gcnew array<Byte>(1000000);
      randomGenerator->NextBytes( byteArray );
      manualEvents[ i ] = gcnew ManualResetEvent( false );
      stateInfo = gcnew State( fileName,byteArray,manualEvents[ i ] );
      ThreadPool::QueueUserWorkItem( gcnew WaitCallback( &Writer::WriteToFile ), stateInfo );

   }
   
   // Since ThreadPool threads are background threads, 
   // wait for the work items to signal before exiting.
   if ( WaitHandle::WaitAll( manualEvents, 5000, false ) )
   {
      Console::WriteLine( "Files written - main exiting." );
   }
   else
   {
      
      // The wait operation times out.
      Console::WriteLine( "Error writing files - main exiting." );
   }
}

using System;
using System.IO;
using System.Security.Permissions;
using System.Threading;

class Test
{
    static void Main()
    {
        const int numberOfFiles = 5;
        string dirName = @"C:\TestTest";
        string fileName;

        byte[] byteArray;
        Random randomGenerator = new Random();

        ManualResetEvent[] manualEvents = 
            new ManualResetEvent[numberOfFiles];
        State stateInfo;

        if(!Directory.Exists(dirName))
        {
            Directory.CreateDirectory(dirName);
        }

        // Queue the work items that create and write to the files.
        for(int i = 0; i < numberOfFiles; i++)
        {
            fileName = string.Concat(
                dirName, @"\Test", i.ToString(), ".dat");

            // Create random data to write to the file.
            byteArray = new byte[1000000];
            randomGenerator.NextBytes(byteArray);

            manualEvents[i] = new ManualResetEvent(false);

            stateInfo = 
                new State(fileName, byteArray, manualEvents[i]);

            ThreadPool.QueueUserWorkItem(new WaitCallback(
                Writer.WriteToFile), stateInfo);
        }
    
        // Since ThreadPool threads are background threads, 
        // wait for the work items to signal before exiting.
        if(WaitHandle.WaitAll(manualEvents, 5000, false))
        {
            Console.WriteLine("Files written - main exiting.");
        }
        else
        {
            // The wait operation times out.
            Console.WriteLine("Error writing files - main exiting.");
        }
    }
}

// Maintain state to pass to WriteToFile.
class State
{
    public string fileName;
    public byte[] byteArray;
    public ManualResetEvent manualEvent;

    public State(string fileName, byte[] byteArray, 
        ManualResetEvent manualEvent)
    {
        this.fileName = fileName;
        this.byteArray = byteArray;
        this.manualEvent = manualEvent;
    }
}

class Writer
{
    static int workItemCount = 0;
    Writer() {}

    public static void WriteToFile(object state)
    {
        int workItemNumber = workItemCount;
        Interlocked.Increment(ref workItemCount);
        Console.WriteLine("Starting work item {0}.",
            workItemNumber.ToString());
        State stateInfo = (State)state;
        FileStream fileWriter = null;

        // Create and write to the file.
        try
        {
            fileWriter = new FileStream(
                stateInfo.fileName, FileMode.Create);
            fileWriter.Write(stateInfo.byteArray, 
                0, stateInfo.byteArray.Length);
        }
        finally
        {
            if(fileWriter != null)
            {
                fileWriter.Close();
            }

            // Signal Main that the work item has finished.
            Console.WriteLine("Ending work item {0}.", 
                workItemNumber.ToString());
            stateInfo.manualEvent.Set();
        }
    }
}
Imports System.IO
Imports System.Security.Permissions
Imports System.Threading

Public Class Test

    ' WaitHandle.WaitAll requires a multithreaded apartment 
    ' when using multiple wait handles.
    <MTAThreadAttribute> _
    Shared Sub Main()
        Const numberOfFiles As Integer = 5
        Dim dirName As String = "C:\TestTest"
        Dim fileName As String 

        Dim byteArray() As Byte 
        Dim randomGenerator As New Random()

        Dim manualEvents(numberOfFiles - 1) As ManualResetEvent
        Dim stateInfo As State 

        If Directory.Exists(dirName) <> True Then
            Directory.CreateDirectory(dirName)
        End If

        ' Queue the work items that create and write to the files.
        For i As Integer = 0 To numberOfFiles - 1
            fileName = String.Concat( _
                dirName, "\Test", i.ToString(), ".dat")

            ' Create random data to write to the file.
            byteArray = New Byte(1000000){}
            randomGenerator.NextBytes(byteArray)

            manualEvents(i) = New ManualResetEvent(false)

            stateInfo = _ 
                New State(fileName, byteArray, manualEvents(i))

            ThreadPool.QueueUserWorkItem(AddressOf _
                Writer.WriteToFile, stateInfo)
        Next i
    
        ' Since ThreadPool threads are background threads, 
        ' wait for the work items to signal before exiting.
        If WaitHandle.WaitAll(manualEvents, 5000, false) = True  Then

            Console.WriteLine("Files written - main exiting.")
        Else
        
            ' The wait operation times out.
            Console.WriteLine("Error writing files - main exiting.")
        End If
    End Sub

End Class
 
' Maintain state to pass to WriteToFile.
Public Class State

    Public fileName As String
    Public byteArray As Byte()
    Public manualEvent As ManualResetEvent

    Sub New(fileName As String, byteArray() As Byte, _
        manualEvent As ManualResetEvent)
    
        Me.fileName = fileName
        Me.byteArray = byteArray
        Me.manualEvent = manualEvent
    End Sub

End Class

Public Class Writer

    Private Sub New()
    End Sub

    Shared workItemCount As Integer = 0

    Shared Sub WriteToFile(state As Object)
        Dim workItemNumber As Integer = workItemCount
        Interlocked.Increment(workItemCount)
        Console.WriteLine("Starting work item {0}.", _
            workItemNumber.ToString())
        Dim stateInfo As State = CType(state, State)
        Dim fileWriter As FileStream = Nothing

        ' Create and write to the file.
        Try
            fileWriter = New FileStream( _
                stateInfo.fileName, FileMode.Create)
            fileWriter.Write(stateInfo.byteArray, _
                0, stateInfo.byteArray.Length)
        Finally
            If Not fileWriter Is Nothing Then
                fileWriter.Close()
            End If

            ' Signal Main that the work item has finished.
            Console.WriteLine("Ending work item {0}.", _
                workItemNumber.ToString())
            stateInfo.manualEvent.Set()
        End Try
    End Sub

End Class

注解

如果 @no__t 为零,则该方法不会阻止。If millisecondsTimeout is zero, the method does not block. 它将测试等待句柄的状态并立即返回。It tests the state of the wait handles and returns immediately.

AbandonedMutexException .NET Framework 版本2.0 中的新版本。AbandonedMutexException is new in the .NET Framework version 2.0. 在以前的版本中,在放弃互斥体时,@no__t 0 方法返回 trueIn previous versions, the WaitAll method returns true when a mutex is abandoned. 被放弃的 mutex 通常表明出现了严重的编码错误。An abandoned mutex often indicates a serious coding error. 对于系统范围内的互斥体,它可能指示应用程序突然终止(例如,使用 Windows 任务管理器)。In the case of a system-wide mutex, it might indicate that an application has been terminated abruptly (for example, by using Windows Task Manager). 此异常包含用于调试的信息。The exception contains information useful for debugging.

当等待终止时(这意味着所有句柄都已发出信号或发生超时),WaitAll 方法返回。The WaitAll method returns when the wait terminates, which means either when all the handles are signaled or when time-out occurs. 在某些实现中,如果传递的句柄超过64,则会引发 NotSupportedExceptionOn some implementations, if more than 64 handles are passed, a NotSupportedException is thrown. 如果数组中有重复项,则调用失败,并 DuplicateWaitObjectExceptionIf there are duplicates in the array, the call fails with a DuplicateWaitObjectException.

备注

@No__t 为1的线程不支持 @no__t 0 方法。The WaitAll method is not supported on threads that have STAThreadAttribute.

有关退出上下文的说明Notes on Exiting the Context

除非在非默认托管上下文内调用了 WaitAll 方法,否则 @no__t 参数不起作用。The exitContext parameter has no effect unless the WaitAll method is called from inside a nondefault managed context. 如果您的线程位于从 ContextBoundObject 派生的类的实例中,则会发生这种情况。This can happen if your thread is inside a call to an instance of a class derived from ContextBoundObject. 即使当前正在对不是从 ContextBoundObject 派生的类执行方法,如 String,如果在当前应用程序域中的堆栈上 @no__t,则可以在非默认上下文中。Even if you are currently executing a method on a class that is not derived from ContextBoundObject, like String, you can be in a nondefault context if a ContextBoundObject is on your stack in the current application domain.

当代码在非默认上下文中执行时,为 @no__t 指定 true 会导致线程在执行 @no__t 2 方法之前退出非默认的托管上下文(即转换到默认上下文)。When your code is executing in a nondefault context, specifying true for exitContext causes the thread to exit the nondefault managed context (that is, to transition to the default context) before executing the WaitAll method. 调用 WaitAll 方法完成后,线程返回到原始的非默认上下文。The thread returns to the original nondefault context after the call to the WaitAll method completes.

当上下文绑定类具有 SynchronizationAttribute 特性时,这会很有用。This can be useful when the context-bound class has the SynchronizationAttribute attribute. 在这种情况下,对类成员的所有调用都将自动同步,同步域是类的整个代码正文。In that case, all calls to members of the class are automatically synchronized, and the synchronization domain is the entire body of code for the class. 如果成员的调用堆栈中的代码调用 WaitAll 方法并指定 exitContext @no__t,则线程将退出同步域,从而允许在对对象的任何成员的调用上被阻止的线程继续。If code in the call stack of a member calls the WaitAll method and specifies true for exitContext, the thread exits the synchronization domain, allowing a thread that is blocked on a call to any member of the object to proceed. WaitAll 方法返回时,进行调用的线程必须等待重新进入同步域。When the WaitAll method returns, the thread that made the call must wait to reenter the synchronization domain.

WaitAll(WaitHandle[], TimeSpan) WaitAll(WaitHandle[], TimeSpan) WaitAll(WaitHandle[], TimeSpan) WaitAll(WaitHandle[], TimeSpan)

等待指定数组中的所有元素接收信号,同时使用 TimeSpan 值指定时间间隔。Waits for all the elements in the specified array to receive a signal, using a TimeSpan value to specify the time interval.

public:
 static bool WaitAll(cli::array <System::Threading::WaitHandle ^> ^ waitHandles, TimeSpan timeout);
public static bool WaitAll (System.Threading.WaitHandle[] waitHandles, TimeSpan timeout);
static member WaitAll : System.Threading.WaitHandle[] * TimeSpan -> bool
Public Shared Function WaitAll (waitHandles As WaitHandle(), timeout As TimeSpan) As Boolean

参数

waitHandles
WaitHandle[]

一个 WaitHandle 数组,包含当前实例将等待的对象。A WaitHandle array containing the objects for which the current instance will wait. 此数组不能包含对同一对象的多个引用。This array cannot contain multiple references to the same object.

timeout
TimeSpan TimeSpan TimeSpan TimeSpan

表示等待毫秒数的 TimeSpan,或表示 -1 毫秒(无限期等待)的 TimeSpanA TimeSpan that represents the number of milliseconds to wait, or a TimeSpan that represents -1 milliseconds, to wait indefinitely.

返回

如果 waitHandles 中的每个元素都已收到信号,则为 true;否则为 falsetrue when every element in waitHandles has received a signal; otherwise, false.

异常

waitHandles 参数为 nullThe waitHandles parameter is null.

-or- waitHandles 数组中一个或多个对象为 nullOne or more of the objects in the waitHandles array is null.

-or- waitHandles 是一个不含任何元素的数组。waitHandles is an array with no elements.

适用于 Windows 应用商店应用的 .NET可移植类库中,改为捕获基类异常 ArgumentExceptionIn the .NET for Windows Store apps or the Portable Class Library, catch the base class exception, ArgumentException, instead.

waitHandles 数组包含重复的元素。The waitHandles array contains elements that are duplicates.

waitHandles 中的对象数大于系统允许的数量。The number of objects in waitHandles is greater than the system permits.

-or- STAThreadAttribute 属性应用于当前线程的线程过程且 waitHandles 包含多个元素。The STAThreadAttribute attribute is applied to the thread procedure for the current thread, and waitHandles contains more than one element.

timeout 为 -1 毫秒以外的负数,表示无限期超时。timeout is a negative number other than -1 milliseconds, which represents an infinite time-out. -or- timeout 大于 MaxValuetimeout is greater than MaxValue.

等待终止,因为线程在未释放互斥的情况下退出。The wait terminated because a thread exited without releasing a mutex. 在 Windows 98 或 Windows Millennium Edition 上不会引发此异常。This exception is not thrown on Windows 98 or Windows Millennium Edition.

waitHandles 数组包含其他应用程序域中 WaitHandle 的透明代理。The waitHandles array contains a transparent proxy for a WaitHandle in another application domain.

注解

如果 @no__t 为零,则该方法不会阻止。If timeout is zero, the method does not block. 它将测试等待句柄的状态并立即返回。It tests the state of the wait handles and returns immediately.

当等待终止时,WaitAll 方法返回,这意味着所有句柄都已发出信号或发生超时。The WaitAll method returns when the wait terminates, which means either all the handles are signaled or a time-out occurs. 在某些实现中,如果传递的句柄超过64,则会引发 NotSupportedExceptionOn some implementations, if more than 64 handles are passed, a NotSupportedException is thrown. 如果数组包含重复项,则调用将失败。If the array contains duplicates, the call will fail.

备注

@No__t 为1的线程不支持 @no__t 0 方法。The WaitAll method is not supported on threads that have STAThreadAttribute.

@No__t 的最大值为-0 @no__t。The maximum value for timeout is Int32.MaxValue.

调用此方法重载与调用 @no__t 0 重载并指定 exitContext @no__t。Calling this method overload is the same as calling the WaitAll(WaitHandle[], TimeSpan, Boolean) overload and specifying false for exitContext.

WaitAll(WaitHandle[], Int32) WaitAll(WaitHandle[], Int32) WaitAll(WaitHandle[], Int32) WaitAll(WaitHandle[], Int32)

等待指定数组中的所有元素接收信号,同时使用 Int32 值指定时间间隔。Waits for all the elements in the specified array to receive a signal, using an Int32 value to specify the time interval.

public:
 static bool WaitAll(cli::array <System::Threading::WaitHandle ^> ^ waitHandles, int millisecondsTimeout);
public static bool WaitAll (System.Threading.WaitHandle[] waitHandles, int millisecondsTimeout);
static member WaitAll : System.Threading.WaitHandle[] * int -> bool
Public Shared Function WaitAll (waitHandles As WaitHandle(), millisecondsTimeout As Integer) As Boolean

参数

waitHandles
WaitHandle[]

一个 WaitHandle 数组,包含当前实例将等待的对象。A WaitHandle array containing the objects for which the current instance will wait. 此数组不能包含对同一对象的多个引用(重复的元素)。This array cannot contain multiple references to the same object (duplicates).

millisecondsTimeout
Int32 Int32 Int32 Int32

等待的毫秒数,或为 Infinite (-1),表示无限期等待。The number of milliseconds to wait, or Infinite (-1) to wait indefinitely.

返回

如果 waitHandles 中的每个元素都已收到信号,则为 true;否则为 falsetrue when every element in waitHandles has received a signal; otherwise, false.

异常

waitHandles 参数为 nullThe waitHandles parameter is null.

-or- waitHandles 数组中一个或多个对象为 nullOne or more of the objects in the waitHandles array is null.

- 或 --or- waitHandles 是一个不含任何元素的数组。waitHandles is an array with no elements.

适用于 Windows 应用商店应用的 .NET可移植类库中,改为捕获基类异常 ArgumentExceptionIn the .NET for Windows Store apps or the Portable Class Library, catch the base class exception, ArgumentException, instead.

waitHandles 数组包含重复的元素。The waitHandles array contains elements that are duplicates.

waitHandles 中的对象数大于系统允许的数量。The number of objects in waitHandles is greater than the system permits.

-or- STAThreadAttribute 属性应用于当前线程的线程过程且 waitHandles 包含多个元素。The STAThreadAttribute attribute is applied to the thread procedure for the current thread, and waitHandles contains more than one element.

millisecondsTimeout 是一个非 -1 的负数,而 -1 表示无限期超时。millisecondsTimeout is a negative number other than -1, which represents an infinite time-out.

等待结束,因为线程在未释放互斥的情况下退出。The wait completed because a thread exited without releasing a mutex. 在 Windows 98 或 Windows Millennium Edition 上不会引发此异常。This exception is not thrown on Windows 98 or Windows Millennium Edition.

waitHandles 数组包含其他应用程序域中 WaitHandle 的透明代理。The waitHandles array contains a transparent proxy for a WaitHandle in another application domain.

注解

如果 @no__t 为零,则该方法不会阻止。If millisecondsTimeout is zero, the method does not block. 它将测试等待句柄的状态并立即返回。It tests the state of the wait handles and returns immediately.

当等待终止时(这意味着所有句柄都已发出信号或发生超时),WaitAll 方法返回。The WaitAll method returns when the wait terminates, which means either when all the handles are signaled or when time-out occurs. 在某些实现中,如果传递的句柄超过64,则会引发 NotSupportedExceptionOn some implementations, if more than 64 handles are passed, a NotSupportedException is thrown. 如果数组中有重复项,则调用失败,并 DuplicateWaitObjectExceptionIf there are duplicates in the array, the call fails with a DuplicateWaitObjectException.

备注

@No__t 为1的线程不支持 @no__t 0 方法。The WaitAll method is not supported on threads that have STAThreadAttribute.

调用此方法重载与调用 @no__t 0 重载并指定 exitContext @no__t。Calling this method overload is the same as calling the WaitAll(WaitHandle[], Int32, Boolean) overload and specifying false for exitContext.

WaitAll(WaitHandle[]) WaitAll(WaitHandle[]) WaitAll(WaitHandle[]) WaitAll(WaitHandle[])

等待指定数组中的所有元素都收到信号。Waits for all the elements in the specified array to receive a signal.

public:
 static bool WaitAll(cli::array <System::Threading::WaitHandle ^> ^ waitHandles);
public static bool WaitAll (System.Threading.WaitHandle[] waitHandles);
static member WaitAll : System.Threading.WaitHandle[] -> bool
Public Shared Function WaitAll (waitHandles As WaitHandle()) As Boolean

参数

waitHandles
WaitHandle[]

一个 WaitHandle 数组,包含当前实例将等待的对象。A WaitHandle array containing the objects for which the current instance will wait. 此数组不能包含对同一对象的多个引用。This array cannot contain multiple references to the same object.

返回

如果 true 中的每个元素都收到信号,则返回 waitHandles;否则该方法永不返回。true when every element in waitHandles has received a signal; otherwise the method never returns.

异常

waitHandles 参数为 nullThe waitHandles parameter is null. -or- waitHandles 数组中一个或多个对象为 nullOne or more of the objects in the waitHandles array are null.

-or- waitHandles 为不具有元素的数组且 .NET Framework 版本为 2.0 或更高版本。waitHandles is an array with no elements and the .NET Framework version is 2.0 or later.

适用于 Windows 应用商店应用的 .NET可移植类库中,改为捕获基类异常 ArgumentExceptionIn the .NET for Windows Store apps or the Portable Class Library, catch the base class exception, ArgumentException, instead.

waitHandles 数组包含重复的元素。The waitHandles array contains elements that are duplicates.

waitHandles 中的对象数大于系统允许的数量。The number of objects in waitHandles is greater than the system permits.

-or- STAThreadAttribute 属性应用于当前线程的线程过程且 waitHandles 包含多个元素。The STAThreadAttribute attribute is applied to the thread procedure for the current thread, and waitHandles contains more than one element.

waitHandles 数组不含任何元素,并且 .NET Framework 版本为 1.0 或 1.1。waitHandles is an array with no elements and the .NET Framework version is 1.0 or 1.1.

等待终止,因为线程在未释放互斥的情况下退出。The wait terminated because a thread exited without releasing a mutex. 在 Windows 98 或 Windows Millennium Edition 上不会引发此异常。This exception is not thrown on Windows 98 or Windows Millennium Edition.

waitHandles 数组包含其他应用程序域中 WaitHandle 的透明代理。The waitHandles array contains a transparent proxy for a WaitHandle in another application domain.

示例

下面的代码示例演示如何使用线程池异步创建和写入一组文件。The following code example shows how to use the thread pool to asynchronously create and write to a group of files. 每个写入操作都作为工作项排队,并在完成后发出信号。Each write operation is queued as a work item and signals when it is finished. 主线程等待所有项发出信号,然后退出。The main thread waits for all the items to signal and then exits.

using namespace System;
using namespace System::IO;
using namespace System::Security::Permissions;
using namespace System::Threading;

ref class State
{
public:
   String^ fileName;
   array<Byte>^byteArray;
   ManualResetEvent^ manualEvent;
   State( String^ fileName, array<Byte>^byteArray, ManualResetEvent^ manualEvent )
      : fileName( fileName ), byteArray( byteArray ), manualEvent( manualEvent )
   {}

};

ref class Writer
{
private:
   static int workItemCount = 0;
   Writer(){}


public:
   static void WriteToFile( Object^ state )
   {
      int workItemNumber = workItemCount;
      Interlocked::Increment( workItemCount );
      Console::WriteLine( "Starting work item {0}.", workItemNumber.ToString() );
      State^ stateInfo = dynamic_cast<State^>(state);
      FileStream^ fileWriter;
      
      // Create and write to the file.
      try
      {
         fileWriter = gcnew FileStream( stateInfo->fileName,FileMode::Create );
         fileWriter->Write( stateInfo->byteArray, 0, stateInfo->byteArray->Length );
      }
      finally
      {
         if ( fileWriter != nullptr )
         {
            fileWriter->Close();
         }
         
         // Signal main() that the work item has finished.
         Console::WriteLine( "Ending work item {0}.", workItemNumber.ToString() );
         stateInfo->manualEvent->Set();
      }

   }

};

void main()
{
   const int numberOfFiles = 5;
   String^ dirName =  "C:\\TestTest";
   String^ fileName;
   array<Byte>^byteArray;
   Random^ randomGenerator = gcnew Random;
   array<ManualResetEvent^>^manualEvents = gcnew array<ManualResetEvent^>(numberOfFiles);
   State^ stateInfo;
   if (  !Directory::Exists( dirName ) )
   {
      Directory::CreateDirectory( dirName );
   }

   
   // Queue the work items that create and write to the files.
   for ( int i = 0; i < numberOfFiles; i++ )
   {
      fileName = String::Concat( dirName,  "\\Test", ((i)).ToString(),  ".dat" );
      
      // Create random data to write to the file.
      byteArray = gcnew array<Byte>(1000000);
      randomGenerator->NextBytes( byteArray );
      manualEvents[ i ] = gcnew ManualResetEvent( false );
      stateInfo = gcnew State( fileName,byteArray,manualEvents[ i ] );
      ThreadPool::QueueUserWorkItem( gcnew WaitCallback( &Writer::WriteToFile ), stateInfo );

   }
   
   // Since ThreadPool threads are background threads, 
   // wait for the work items to signal before exiting.
   WaitHandle::WaitAll( manualEvents );
   Console::WriteLine( "Files written - main exiting." );
}

using System;
using System.IO;
using System.Security.Permissions;
using System.Threading;

class Test
{
    static void Main()
    {
        const int numberOfFiles = 5;
        string dirName = @"C:\TestTest";
        string fileName;

        byte[] byteArray;
        Random randomGenerator = new Random();

        ManualResetEvent[] manualEvents = 
            new ManualResetEvent[numberOfFiles];
        State stateInfo;

        if(!Directory.Exists(dirName))
        {
            Directory.CreateDirectory(dirName);
        }

        // Queue the work items that create and write to the files.
        for(int i = 0; i < numberOfFiles; i++)
        {
            fileName = string.Concat(
                dirName, @"\Test", i.ToString(), ".dat");

            // Create random data to write to the file.
            byteArray = new byte[1000000];
            randomGenerator.NextBytes(byteArray);

            manualEvents[i] = new ManualResetEvent(false);

            stateInfo = 
                new State(fileName, byteArray, manualEvents[i]);

            ThreadPool.QueueUserWorkItem(new WaitCallback(
                Writer.WriteToFile), stateInfo);
        }
    
        // Since ThreadPool threads are background threads, 
        // wait for the work items to signal before exiting.
        WaitHandle.WaitAll(manualEvents);
        Console.WriteLine("Files written - main exiting.");
    }
}

// Maintain state to pass to WriteToFile.
class State
{
    public string fileName;
    public byte[] byteArray;
    public ManualResetEvent manualEvent;

    public State(string fileName, byte[] byteArray, 
        ManualResetEvent manualEvent)
    {
        this.fileName = fileName;
        this.byteArray = byteArray;
        this.manualEvent = manualEvent;
    }
}

class Writer
{
    static int workItemCount = 0;
    Writer() {}

    public static void WriteToFile(object state)
    {
        int workItemNumber = workItemCount;
        Interlocked.Increment(ref workItemCount);
        Console.WriteLine("Starting work item {0}.",
            workItemNumber.ToString());
        State stateInfo = (State)state;
        FileStream fileWriter = null;

        // Create and write to the file.
        try
        {
            fileWriter = new FileStream(
                stateInfo.fileName, FileMode.Create);
            fileWriter.Write(stateInfo.byteArray, 
                0, stateInfo.byteArray.Length);
        }
        finally
        {
            if(fileWriter != null)
            {
                fileWriter.Close();
            }

            // Signal Main that the work item has finished.
            Console.WriteLine("Ending work item {0}.", 
                workItemNumber.ToString());
            stateInfo.manualEvent.Set();
        }
    }
}
Imports System.IO
Imports System.Security.Permissions
Imports System.Threading

Public Class Test

    ' WaitHandle.WaitAll requires a multithreaded apartment 
    ' when using multiple wait handles.
    <MTAThreadAttribute> _
    Shared Sub Main()
        Const numberOfFiles As Integer = 5
        Dim dirName As String = "C:\TestTest"
        Dim fileName As String 

        Dim byteArray() As Byte 
        Dim randomGenerator As New Random()

        Dim manualEvents(numberOfFiles - 1) As ManualResetEvent
        Dim stateInfo As State 

        If Directory.Exists(dirName) <> True Then
            Directory.CreateDirectory(dirName)
        End If

        ' Queue the work items that create and write to the files.
        For i As Integer = 0 To numberOfFiles - 1
            fileName = String.Concat( _
                dirName, "\Test", i.ToString(), ".dat")

            ' Create random data to write to the file.
            byteArray = New Byte(1000000){}
            randomGenerator.NextBytes(byteArray)

            manualEvents(i) = New ManualResetEvent(false)

            stateInfo = _ 
                New State(fileName, byteArray, manualEvents(i))

            ThreadPool.QueueUserWorkItem(AddressOf _
                Writer.WriteToFile, stateInfo)
        Next i
    
        ' Since ThreadPool threads are background threads, 
        ' wait for the work items to signal before exiting.
        WaitHandle.WaitAll(manualEvents)
        Console.WriteLine("Files written - main exiting.")
    End Sub

End Class
 
' Maintain state to pass to WriteToFile.
Public Class State

    Public fileName As String
    Public byteArray As Byte()
    Public manualEvent As ManualResetEvent

    Sub New(fileName As String, byteArray() As Byte, _
        manualEvent As ManualResetEvent)
    
        Me.fileName = fileName
        Me.byteArray = byteArray
        Me.manualEvent = manualEvent
    End Sub

End Class

Public Class Writer

    Private Sub New()
    End Sub

    Shared workItemCount As Integer = 0

    Shared Sub WriteToFile(state As Object)
        Dim workItemNumber As Integer = workItemCount
        Interlocked.Increment(workItemCount)
        Console.WriteLine("Starting work item {0}.", _
            workItemNumber.ToString())
        Dim stateInfo As State = CType(state, State)
        Dim fileWriter As FileStream = Nothing

        ' Create and write to the file.
        Try
            fileWriter = New FileStream( _
                stateInfo.fileName, FileMode.Create)
            fileWriter.Write(stateInfo.byteArray, _
                0, stateInfo.byteArray.Length)
        Finally
            If Not fileWriter Is Nothing Then
                fileWriter.Close()
            End If

            ' Signal Main that the work item has finished.
            Console.WriteLine("Ending work item {0}.", _
                workItemNumber.ToString())
            stateInfo.manualEvent.Set()
        End Try
    End Sub

End Class

注解

AbandonedMutexException .NET Framework 版本2.0 中的新版本。AbandonedMutexException is new in the .NET Framework version 2.0. 在以前的版本中,在放弃互斥体时,@no__t 0 方法返回 trueIn previous versions, the WaitAll method returns true when a mutex is abandoned. 被放弃的 mutex 通常表明出现了严重的编码错误。An abandoned mutex often indicates a serious coding error. 对于系统范围内的互斥体,它可能指示应用程序突然终止(例如,使用 Windows 任务管理器)。In the case of a system-wide mutex, it might indicate that an application has been terminated abruptly (for example, by using Windows Task Manager). 此异常包含用于调试的信息。The exception contains information useful for debugging.

当所有句柄都收到信号时,@no__t 0 方法返回。The WaitAll method returns when all the handles are signaled. 在某些实现中,如果传递的句柄超过64,则会引发 NotSupportedExceptionOn some implementations, if more than 64 handles are passed, a NotSupportedException is thrown. 如果数组包含重复项,则调用失败,并 DuplicateWaitObjectExceptionIf the array contains duplicates, the call fails with a DuplicateWaitObjectException.

备注

@No__t 为1的线程不支持 @no__t 0 方法。The WaitAll method is not supported on threads that have STAThreadAttribute.

调用此方法重载等效于调用 @no__t 0 方法重载,并为 exitContext 的 @no__t @no__t 指定-1 (或 Timeout.Infinite)。Calling this method overload is equivalent to calling the WaitAll(WaitHandle[], Int32, Boolean) method overload and specifying -1 (or Timeout.Infinite) for millisecondsTimeout and true for exitContext.

适用于