WaitHandle.WaitAll 方法

Source:

WaitHandle.cs

Source:

WaitHandle.cs

Source:

WaitHandle.cs

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

返回

如果 waitHandles 中的每个元素都收到信号，则为 true；否则为 false。

例外

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。 每个写入操作作为工作项排队，并在完成时发出信号。 main线程等待所有项发出信号，然后退出。

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 timeout 为零，则 方法不会阻止。 它测试等待句柄的状态并立即返回。

如果放弃互斥体， AbandonedMutexException 则会引发 。 放弃的互斥体通常表示存在严重的编码错误。 对于系统范围的互斥，它可能表示应用程序已突然终止 (，例如，使用 Windows 任务管理器) 。 异常包含对调试有用的信息。

方法 WaitAll 在等待终止时返回，这意味着发出所有句柄的信号或发生超时。 如果传递的句柄超过 64 个 NotSupportedException ，则会引发 。 如果数组包含重复项，则调用将失败。

的 timeout 最大值为 Int32.MaxValue。

退出上下文

除非 exitContext 从非默认托管上下文中调用此方法，否则 参数不起作用。 如果线程位于对派生自 ContextBoundObject的类实例的调用中，则托管上下文可能是非默认的。 即使当前正在对不是派生自 ContextBoundObject的类（如 ） String执行方法，也可以位于非默认上下文中（ ContextBoundObject 如果 位于当前应用程序域的堆栈上）。

当代码在非默认上下文中执行时，将 指定 为 trueexitContext 会使线程退出非默认托管上下文 (即在执行此方法之前转换为默认上下文) 。 对此方法的调用完成后，线程将返回到原始的非默认上下文。

当上下文绑定类具有 属性时， SynchronizationAttribute 退出上下文可能很有用。 在这种情况下，将自动同步对 类成员的所有调用，并且同步域是类的整个代码主体。 如果成员的调用堆栈中的代码调用此方法并为 指定 trueexitContext，则线程将退出同步域，从而允许在调用 对象的任何成员时被阻止的线程继续。 此方法返回时，进行调用的线程必须等待重新进入同步域。

Source:

WaitHandle.cs

Source:

WaitHandle.cs

Source:

WaitHandle.cs

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

返回

如果 waitHandles 中的每个元素都已收到信号，则为 true；否则为 false。

例外

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。 每个写入操作作为工作项排队，并在完成时发出信号。 main线程等待所有项发出信号，然后退出。

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 millisecondsTimeout 为零，则 方法不会阻止。 它测试等待句柄的状态并立即返回。

如果放弃互斥体， AbandonedMutexException 则会引发 。 放弃的互斥体通常表示存在严重的编码错误。 对于系统范围的互斥，它可能表示应用程序已突然终止 (，例如，使用 Windows 任务管理器) 。 异常包含对调试有用的信息。

方法 WaitAll 在等待终止时返回，这意味着当发出所有句柄的信号或发生超时时。 如果传递的句柄超过 64 个 NotSupportedException ，则会引发 。 如果数组中存在重复项，则调用失败并显示 DuplicateWaitObjectException。

退出上下文

除非 exitContext 从非默认托管上下文中调用此方法，否则 参数不起作用。 如果线程位于对派生自 ContextBoundObject的类实例的调用中，则托管上下文可能是非默认的。 即使当前正在对不是派生自 ContextBoundObject的类（如 ） String执行方法，也可以位于非默认上下文中（ ContextBoundObject 如果 位于当前应用程序域的堆栈上）。

当代码在非默认上下文中执行时，将 指定 为 trueexitContext 会使线程退出非默认托管上下文 (即在执行此方法之前转换为默认上下文) 。 对此方法的调用完成后，线程将返回到原始的非默认上下文。

当上下文绑定类具有 属性时， SynchronizationAttribute 退出上下文可能很有用。 在这种情况下，将自动同步对 类成员的所有调用，并且同步域是类的整个代码主体。 如果成员的调用堆栈中的代码调用此方法并为 指定 trueexitContext，则线程将退出同步域，从而允许在调用 对象的任何成员时被阻止的线程继续。 此方法返回时，进行调用的线程必须等待重新进入同步域。

Source:

WaitHandle.cs

Source:

WaitHandle.cs

Source:

WaitHandle.cs

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

返回

如果 waitHandles 中的每个元素都已收到信号，则为 true；否则为 false。

例外

注解

如果 timeout 为零，则该方法不会阻止。 它测试等待句柄的状态并立即返回。

方法 WaitAll 在等待终止时返回，这意味着所有句柄都已发出信号或发生超时。 如果传递的句柄超过 64 个 NotSupportedException ，则会引发 。 如果数组包含重复项，则调用将失败。

的 timeout 最大值为 Int32.MaxValue。

调用此方法重载与调用 WaitAll(WaitHandle[], TimeSpan, Boolean) 重载并为 指定falseexitContext相同。

Source:

WaitHandle.cs

Source:

WaitHandle.cs

Source:

WaitHandle.cs

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

返回

如果 waitHandles 中的每个元素都已收到信号，则为 true；否则为 false。

例外

注解

如果 millisecondsTimeout 为零，则该方法不会阻止。 它测试等待句柄的状态并立即返回。

方法 WaitAll 在等待终止时返回，这意味着在发出所有句柄信号时或发生超时时返回。 如果传递的句柄超过 64 个 NotSupportedException ，则会引发 。 如果数组中存在重复项，调用将失败并出现 DuplicateWaitObjectException。

调用此方法重载与调用 WaitAll(WaitHandle[], Int32, Boolean) 重载并为 指定falseexitContext相同。

Source:

WaitHandle.cs

Source:

WaitHandle.cs

Source:

WaitHandle.cs

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

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。

例外

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。 每个写入操作作为工作项排队，并在完成时发出信号。 main线程等待所有项发出信号，然后退出。

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是 .NET Framework 版本 2.0 中的新增功能。 在以前的版本中， WaitAll 方法在 true 放弃互斥体时返回 。 放弃的互斥通常表示存在严重的编码错误。 对于系统范围的互斥体，这可能指示应用程序已突然终止，例如，使用 Windows 任务管理器) (。 异常包含对调试有用的信息。

当发出所有句柄的信号时，方法 WaitAll 返回 。 如果传递的句柄超过 64 个 NotSupportedException ，则会引发 。 如果数组包含重复项，调用将失败并出现 DuplicateWaitObjectException。

调用此方法重载等效于调用WaitAll(WaitHandle[], Int32, Boolean)方法重载并为 和 trueexitContext指定 -1 (或 Timeout.Infinite) millisecondsTimeout。