ArrayList.Synchronized 方法

定义

命名空间:

System.Collections

程序集:

System.Runtime.dll

返回同步的（线程安全）列表包装。

重载

Synchronized(ArrayList)	返回同步的（线程安全）ArrayList 包装器。
Synchronized(IList)	返回同步的（线程安全）IList 包装器。

Synchronized(ArrayList)

Source:

ArrayList.cs

返回同步的（线程安全）ArrayList 包装器。

public:
 static System::Collections::ArrayList ^ Synchronized(System::Collections::ArrayList ^ list);

public static System.Collections.ArrayList Synchronized (System.Collections.ArrayList list);

static member Synchronized : System.Collections.ArrayList -> System.Collections.ArrayList

Public Shared Function Synchronized (list As ArrayList) As ArrayList

参数

list

ArrayList

要同步的 ArrayList。

返回

ArrayList

同步的（线程安全）ArrayList 包装器。

例外

ArgumentNullException

list 为 null。

示例

下面的代码示例演示如何在整个枚举期间使用 SyncRoot 锁定集合。

ArrayList^ myCollection = gcnew ArrayList();
bool lockTaken = false;
try
{
    Monitor::Enter(myCollection->SyncRoot, lockTaken);
    for each (Object^ item in myCollection);
    {
        // Insert your code here.
    }
}
finally
{
    if (lockTaken)
    {
        Monitor::Exit(myCollection->SyncRoot);
    }
}

ArrayList myCollection = new ArrayList();

lock(myCollection.SyncRoot)
{
    foreach (object item in myCollection)
    {
        // Insert your code here.
    }
}

Dim myCollection As New ArrayList()

SyncLock myCollection.SyncRoot
    For Each item As Object In myCollection
        ' Insert your code here.
    Next item
End SyncLock

此方法是一种 O(1) 操作。

下面的代码示例演示如何同步 ， ArrayList确定 是否 ArrayList 同步并使用同步的 ArrayList。

using namespace System;
using namespace System::Collections;
int main()
{
   
   // Creates and initializes a new ArrayList instance.
   ArrayList^ myAL = gcnew ArrayList;
   myAL->Add( "The" );
   myAL->Add( "quick" );
   myAL->Add( "brown" );
   myAL->Add( "fox" );
   
   // Creates a synchronized wrapper around the ArrayList.
   ArrayList^ mySyncdAL = ArrayList::Synchronized( myAL );
   
   // Displays the sychronization status of both ArrayLists.
   String^ szRes = myAL->IsSynchronized ?  (String^)"synchronized" :  "not synchronized";
   Console::WriteLine(  "myAL is {0}.", szRes );
   String^ szSyncRes = mySyncdAL->IsSynchronized ?  (String^)"synchronized" :  "not synchronized";
   Console::WriteLine(  "mySyncdAL is {0}.", szSyncRes );
}

/* 
 This code produces the following output.
 
 myAL is not synchronized.
 mySyncdAL is synchronized.
 */

using System;
using System.Collections;
public class SamplesArrayList  {

   public static void Main()  {

      // Creates and initializes a new ArrayList.
      ArrayList myAL = new ArrayList();
      myAL.Add( "The" );
      myAL.Add( "quick" );
      myAL.Add( "brown" );
      myAL.Add( "fox" );

      // Creates a synchronized wrapper around the ArrayList.
      ArrayList mySyncdAL = ArrayList.Synchronized( myAL );

      // Displays the sychronization status of both ArrayLists.
      Console.WriteLine( "myAL is {0}.", myAL.IsSynchronized ? "synchronized" : "not synchronized" );
      Console.WriteLine( "mySyncdAL is {0}.", mySyncdAL.IsSynchronized ? "synchronized" : "not synchronized" );
   }
}
/*
This code produces the following output.

myAL is not synchronized.
mySyncdAL is synchronized.
*/

Imports System.Collections

Public Class SamplesArrayList
    
    
    Public Shared Sub Main()
        
        ' Creates and initializes a new ArrayList.
        Dim myAL As New ArrayList()
        myAL.Add("The")
        myAL.Add("quick")
        myAL.Add("brown")
        myAL.Add("fox")
        
        ' Creates a synchronized wrapper around the ArrayList.
        Dim mySyncdAL As ArrayList = ArrayList.Synchronized(myAL)
        
        ' Displays the sychronization status of both ArrayLists.
        Dim str As String
        If myAL.IsSynchronized Then
            str = "synchronized"
        Else
            str = "not synchronized"
        End If
        Console.WriteLine("myAL is {0}.", str)
        If mySyncdAL.IsSynchronized Then
            str = "synchronized"
        Else
            str = "not synchronized"
        End If
        Console.WriteLine("mySyncdAL is {0}.", str)
    End Sub
End Class

' This code produces the following output.
' 
' myAL is not synchronized.
' mySyncdAL is synchronized.

注解

若要保证 的 ArrayList线程安全，必须通过此包装器执行所有操作。

枚举整个集合本质上不是一个线程安全的过程。 即使某个集合已同步，其他线程仍可以修改该集合，这会导致枚举数引发异常。 若要确保枚举过程中的线程安全性，可以在整个枚举期间锁定集合，或者捕获由其他线程进行的更改所导致的异常。

另请参阅

• SyncRoot
• IsSynchronized

Synchronized(IList)

Source:

ArrayList.cs

返回同步的（线程安全）IList 包装器。

public:
 static System::Collections::IList ^ Synchronized(System::Collections::IList ^ list);

public static System.Collections.IList Synchronized (System.Collections.IList list);

static member Synchronized : System.Collections.IList -> System.Collections.IList

Public Shared Function Synchronized (list As IList) As IList

参数

list

IList

要同步的 IList。

返回

IList

同步的（线程安全）IList 包装器。

例外

ArgumentNullException

list 为 null。

示例

下面的代码示例演示如何在整个枚举期间使用 SyncRoot 锁定集合。

ArrayList^ myCollection = gcnew ArrayList();
bool lockTaken = false;
try
{
    Monitor::Enter(myCollection->SyncRoot, lockTaken);
    for each (Object^ item in myCollection);
    {
        // Insert your code here.
    }
}
finally
{
    if (lockTaken)
    {
        Monitor::Exit(myCollection->SyncRoot);
    }
}

ArrayList myCollection = new ArrayList();

lock(myCollection.SyncRoot)
{
    foreach (object item in myCollection)
    {
        // Insert your code here.
    }
}

Dim myCollection As New ArrayList()

SyncLock myCollection.SyncRoot
    For Each item As Object In myCollection
        ' Insert your code here.
    Next item
End SyncLock

此方法是一种 O(1) 操作。

注解

若要保证 的 ArrayList线程安全，必须通过此包装器执行所有操作。

枚举整个集合本质上不是一个线程安全的过程。 即使某个集合已同步，其他线程仍可以修改该集合，这会导致枚举数引发异常。 若要确保枚举过程中的线程安全性，可以在整个枚举期间锁定集合，或者捕获由其他线程进行的更改所导致的异常。

另请参阅

• SyncRoot
• IsSynchronized