关于 C# 中的 volatile 关键字

这样可以确保该字段在任何时间呈现的都是最新的值。

lock 语句对访问进行序列化的字段。

volatile 关键字可应用于以下类型的字段：

引用类型。
换句话说，您无法声明“指向可变对象的指针”。
类型，如 sbyte、byte、short、ushort、int、uint、char、float 和 bool。
具有以下基类型之一的枚举类型：byte、sbyte、short、ushort、int 或 uint。
已知为引用类型的泛型类型参数。
UIntPtr。

volatile。

线程处理（C# 和 Visual Basic）。

using System;
using System.Threading;

namespace WorkerThreadExample
{
class Program
    {
static void Main(string[] args)
        {
// Create the worker thread object. This does not start the thread.
            Worker workerObject = new Worker();
            Thread workerThread = new Thread(workerObject.DoWork);

// Start the worker thread.
            workerThread.Start();
            Console.WriteLine("Main thread: starting worker thread...");

// Loop until the worker thread activates.
            while (!workerThread.IsAlive) ;

// Put the main thread to sleep for 1 millisecond to
// allow the worker thread to do some work.
            Thread.Sleep(1);

// Request that the worker thread stop itself.
            workerObject.RequestStop();

// Use the Thread.Join method to block the current thread 
// until the object's thread terminates.
            workerThread.Join();
            Console.WriteLine("Main thread: worker thread has terminated.");
        }
// Sample output:
// Main thread: starting worker thread...
// Worker thread: working...
// Worker thread: working...
// Worker thread: working...
// Worker thread: working...
// Worker thread: working...
// Worker thread: working...
// Worker thread: terminating gracefully.
// Main thread: worker thread has terminated.
    }

public class Worker
    {
// This method is called when the thread is started.
        public void DoWork()
        {
while (!_shouldStop)
            {
                Console.WriteLine("Worker thread: working...");
            }
            Console.WriteLine("Worker thread: terminating gracefully.");
        }
public void RequestStop()
        {
            _shouldStop = true;
        }
// Keyword volatile is used as a hint to the compiler that this data
// member is accessed by multiple threads.
        private volatile bool _shouldStop;
    }
}

参考 MSDN http://msdn.microsoft.com/zh-cn/library/x13ttww7.aspx

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