Queue.Synchronized(Queue) 方法

public:
 static System::Collections::Queue ^ Synchronized(System::Collections::Queue ^ queue);

public static System.Collections.Queue Synchronized(System.Collections.Queue queue);

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

Public Shared Function Synchronized (queue As Queue) As Queue

参数

返回

Queue已同步的包装器（线程安全）。

例外

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。 此方法是一个 O(1) 操作。

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

Dim myCollection As New Queue()
SyncLock myCollection.SyncRoot
    For Each item In myCollection
        ' Insert your code here.
    Next item
End SyncLock

以下示例演示如何同步 a Queue、确定 Queue 是否已同步并使用同步 Queue。

using System;
using System.Collections;

public class SamplesQueue
{
    public static void Main()
    {
        // Creates and initializes a new Queue.
        Queue myQ = new Queue();
        myQ.Enqueue("The");
        myQ.Enqueue("quick");
        myQ.Enqueue("brown");
        myQ.Enqueue("fox");

        // Creates a synchronized wrapper around the Queue.
        Queue mySyncdQ = Queue.Synchronized(myQ);

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

myQ is not synchronized.
mySyncdQ is synchronized.
*/

Imports System.Collections

Public Class SamplesQueue    
    
    Public Shared Sub Main()
        
        ' Creates and initializes a new Queue.
        Dim myQ As New Queue()
        myQ.Enqueue("The")
        myQ.Enqueue("quick")
        myQ.Enqueue("brown")
        myQ.Enqueue("fox")
        
        ' Creates a synchronized wrapper around the Queue.
        Dim mySyncdQ As Queue = Queue.Synchronized(myQ)
        
        ' Displays the sychronization status of both Queues.
        Dim msg As String
        If myQ.IsSynchronized Then
            msg = "synchronized"
        Else
            msg = "not synchronized"
        End If
        Console.WriteLine("myQ is {0}.", msg)
        If mySyncdQ.IsSynchronized Then
            msg = "synchronized"
        Else
            msg = "not synchronized"
        End If
        Console.WriteLine("mySyncdQ is {0}.", msg)
    End Sub
End Class

' This code produces the following output.
' 
' myQ is not synchronized.
' mySyncdQ is synchronized.

注解

此方法返回的包装器在执行操作之前锁定队列，以便以线程安全的方式执行。

若要保证线程安全性 Queue，必须仅通过此包装器执行所有操作。

通过集合进行枚举本质上不是线程安全的过程。 即使集合同步，其他线程仍可以修改集合，这会导致枚举器引发异常。 若要保证枚举期间的线程安全性，可以在整个枚举期间锁定集合，也可以捕获由其他线程所做的更改导致的异常。

另请参阅

• IsSynchronized
• SyncRoot