ThreadStaticAttribute和ThreadLocal<T>使用区别总结

ThreadStaticAttribute和ThreadLocal<T>都是提供线程本地存储，ThreadLocal<T>是.net4才提供的。

ThreadStaticAttribute只能标注静态字段，而ThreadLocal<T>可以对实例字段才有效。

如果不标注ThreadStaticAttribute，则多个线程共享一个变量，这样的话会引起冲突的。

 class Program
    {

         static void Main()

        {

            Console.WriteLine("use [ThreadStaticAttribute]");

            for (int i = 0; i < 3; i++)

            {

                Thread newThread = new Thread(ThreadData1.ThreadStaticDemo);

                newThread.Start();

            }

 
            Thread.Sleep(500);

            Console.WriteLine("not use [ThreadStaticAttribute]");

            for (int i = 0; i < 3; i++)

            {

                Thread newThread = new Thread(ThreadData2.ThreadStaticDemo);

                newThread.Start();

            }

            Thread.Sleep(500);

            Console.WriteLine("not use static member, use instance member");

            for (int i = 0; i < 3; i++)

            {

                Thread newThread = new Thread((new ThreadData3()).ThreadStaticDemo);

                newThread.Start();

            }

            Thread.Sleep(500);

            Console.WriteLine("");

            for (int i = 0; i < 3; i++)

            {

                Thread newThread = new Thread(ThreadData4.ThreadStaticDemo);

                newThread.Start();

            }

             Thread.Sleep(500);

            Console.WriteLine("not use [ThreadStaticAttribute], use ThreadLocal<int>");

            for (int i = 0; i < 3; i++)

            {

                Thread newThread = new Thread(ThreadData5.ThreadStaticDemo);

                newThread.Start();

            }

            Thread.Sleep(500);

            Console.WriteLine("not use [ThreadStaticAttribute], use ThreadLocal<int>");

             ThreadLocal<string> ThreadName = new ThreadLocal<string>(() =>

            {

                return "Thread" + Thread.CurrentThread.ManagedThreadId;

            });

 
            // Action that prints out ThreadName for the current thread

            Action action = () =>

            {

                // If ThreadName.IsValueCreated is true, it means that we are not the

                // first action to run on this thread.

                bool repeat = ThreadName.IsValueCreated;

 
                Console.WriteLine("ThreadName = {0} {1}", ThreadName.Value, repeat ? "(repeat)" : "");

            };

 
            // Launch eight of them.  On 4 cores or less, you should see some repeat ThreadNames

            Parallel.Invoke(action, action, action, action, action, action, action, action);

             // Dispose when you are done

            ThreadName.Dispose();

         }

     }

 
    class ThreadData1

    {

        static int threadSpecificData;

        public static void ThreadStaticDemo()

        {

            // Store the managed thread id for each thread in the static

            // variable.

            threadSpecificData = Thread.CurrentThread.ManagedThreadId;

 
            // Allow other threads time to execute the same code, to show

            // that the static data is unique to each thread.

            Thread.Sleep(100);

 
            // Display the static data.

            Console.WriteLine("Data for managed thread {0}: {1}",

                Thread.CurrentThread.ManagedThreadId, threadSpecificData);

 
        }

    }

 
    class ThreadData2

    {

        [ThreadStaticAttribute]//可¨¦以°?省º?去¨£¤Attribute直¡À接¨®写¡ä[ThreadStatic] 语®?法¤¡§糖¬?

        static int threadSpecificData;

        public static void ThreadStaticDemo()

        {

            // Store the managed thread id for each thread in the static

            // variable.

            threadSpecificData = Thread.CurrentThread.ManagedThreadId;

 
            // Allow other threads time to execute the same code, to show

            // that the static data is unique to each thread.

            Thread.Sleep(100);

 
            // Display the static data.

            Console.WriteLine("Data for managed thread {0}: {1}",

                Thread.CurrentThread.ManagedThreadId, threadSpecificData);

 
        }

    }

 
    class ThreadData3 //使º1用®?实º¦Ì例¤y方¤?法¤¡§也°2可¨¦以°?实º¦Ì现?上¦?述º?效¡ì果?，ê?每?个?线?程¨¬单Ì£¤独¨¤使º1用®?各¡Â自Á?的Ì?变À?量¢?

    {

        int threadSpecificData;

 
        public void ThreadStaticDemo()

        {

            // Store the managed thread id for each thread in the static

            // variable.

            threadSpecificData = Thread.CurrentThread.ManagedThreadId;

 
            // Allow other threads time to execute the same code, to show

            // that the static data is unique to each thread.

            Thread.Sleep(100);

 
            // Display the static data.

            Console.WriteLine("Data for managed thread {0}: {1}",

                Thread.CurrentThread.ManagedThreadId, threadSpecificData);

         }

    }

     class ThreadData4

    {

        [ThreadStaticAttribute]//可¨¦以°?省º?去¨£¤Attribute直¡À接¨®写¡ä[ThreadStatic] 语®?法¤¡§糖¬?

        static test t = null;

        public static void ThreadStaticDemo()

        {

            t = new test();

 
            Thread.Sleep(100);

            // Display the static data.

            Console.WriteLine(t.testvalue);

 
        }

    }

     class test

    {

        public int testvalue = 0;

         public test()

        {

            testvalue++;

        }

    }

 
 
    class ThreadData5

    {

        static ThreadLocal<int> threadSpecificData = new ThreadLocal<int>();//only in .net framework 4.0. no need to use [ThreadStaticAttribute]

        static public void ThreadStaticDemo()

        {

            // Store the managed thread id for each thread in the static

            // variable.

            threadSpecificData.Value = Thread.CurrentThread.ManagedThreadId;

             // Allow other threads time to execute the same code, to show

            // that the static data is unique to each thread.

            Thread.Sleep(100);

 
            // Display the static data.

            Console.WriteLine("Data for managed thread {0}: {1}",

                Thread.CurrentThread.ManagedThreadId, threadSpecificData.Value);

         }

    }

 
 

 

本文转自cnn23711151CTO博客，原文链接：http://blog.51cto.com/cnn237111/545801 ，如需转载请自行联系原作者