ThreadStatic attribute

A static field marked with ThreadStaticAttribute is not shared between threads. Each executing thread has a separate instance of the field, and independently sets and gets values for that field. If the field is accessed on a different thread, it will contain a different value.

1. ThreadStatic must on top of a static member

2. DO NOT specify the initial value/reference, it won't take effect.

Here is the reference and test code.

http://msdn.microsoft.com/en-us/library/system.threadstaticattribute.aspx

http://blogs.msdn.com/b/jfoscoding/archive/2006/07/18/670497.aspx

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading;namespace ConsoleApplication1{    class ThreadStaticTest    {        public static void _Main()        {            ThreadStaticTest1 test = new ThreadStaticTest1();            new Thread(new ThreadStart(test.Run)).Start();            Console.ReadLine();            new Thread(new ThreadStart(test.Run)).Start();            Console.ReadLine();            test.wait.Set();        }    }    class ThreadStaticTest1    {        [ThreadStatic]        private static string strTreadStatic="stat";        private static string strNonThreadStatic="nonstat";        public EventWaitHandle wait;        public ThreadStaticTest1()        {            wait = new EventWaitHandle(false, EventResetMode.ManualReset);        }        private void Display()        {            Console.WriteLine("Static: " + strTreadStatic);            Console.WriteLine("Non static: " + strNonThreadStatic);        }        public void Run()        {            Console.WriteLine("Original\r\n===========");            Display();            strTreadStatic = Guid.NewGuid().ToString();            strNonThreadStatic = Guid.NewGuid().ToString();            Console.WriteLine("Changed\r\n============");            Display();            wait.WaitOne();            Console.WriteLine("quit Run");        }    }}

Original
===========
Static:
Non static: nonstat
Changed
============
Static: 4037bdc9-68e6-4035-b6bb-e9ecc4f9b4e2
Non static: 262a1339-9957-4fe2-9e49-bd0fa9450fcc


Original
===========
Static:
Non static: 262a1339-9957-4fe2-9e49-bd0fa9450fcc
Changed
============
Static: 21c971d8-66df-4eb5-bd7c-a63c50951a3f
Non static: 723b2f9d-9027-41f3-b491-47a027db6102


quit Run
quit Run
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