ArrayList.Synchronized 方法

定義

命名空間:

System.Collections

組件:

System.Runtime.dll

傳回同步 (安全執行緒) 的清單包裝函式。

多載

Synchronized(ArrayList)	傳回已同步 (安全執行緒) 的 ArrayList 包裝函式。
Synchronized(IList)	傳回已同步 (安全執行緒) 的 IList 包裝函式。

Synchronized(ArrayList)

來源:

ArrayList.cs

傳回已同步 (安全執行緒) 的 ArrayList 包裝函式。

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

參數

list

ArrayList

要同步處理的 ArrayList。

傳回

ArrayList

已同步 (安全執行緒) 的 ArrayList 包裝函式。

例外狀況

ArgumentNullException

list 為 null。

範例

下列程式代碼範例示範如何在整個列舉期間使用 SyncRoot 鎖定集合。

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

這個方法是作業 O(1) 。

下列程式代碼範例示範如何同步 ArrayList處理 ，判斷 是否已 ArrayList 同步處理，並使用已同步處理的 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.

備註

若要保證的 ArrayList線程安全性，所有作業都必須透過這個包裝函式來完成。

透過集合進行列舉在本質上並非安全執行緒程序。 即使集合經過同步化，其他的執行緒仍可修改該集合，使列舉值擲回例外狀況。 若要保證列舉過程的執行緒安全，您可以在整個列舉過程中鎖定集合，或攔截由其他執行緒的變更所造成的例外狀況。

另請參閱

• SyncRoot
• IsSynchronized

Synchronized(IList)

來源:

ArrayList.cs

傳回已同步 (安全執行緒) 的 IList 包裝函式。

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

參數

list

IList

要同步處理的 IList。

傳回

IList

已同步 (安全執行緒) 的 IList 包裝函式。

例外狀況

ArgumentNullException

list 為 null。

範例

下列程式代碼範例示範如何在整個列舉期間使用 SyncRoot 鎖定集合。

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

這個方法是作業 O(1) 。

備註

若要保證的 ArrayList線程安全性，所有作業都必須透過這個包裝函式來完成。

透過集合進行列舉在本質上並非安全執行緒程序。 即使集合經過同步化，其他的執行緒仍可修改該集合，使列舉值擲回例外狀況。 若要保證列舉過程的執行緒安全，您可以在整個列舉過程中鎖定集合，或攔截由其他執行緒的變更所造成的例外狀況。

另請參閱

• SyncRoot
• IsSynchronized