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ThreadLocal storage in .NET

| Monday, August 22, 2011
   Similar to Lazy, ThreadLocal creates object local to one thread. So each individual thread will have its own Lazy initializer object and hence will create the object multiple times once for each thread. In .NET 3.5 or before, you can create objects that are local to one thread using ThreadStatic attribute. But sometimes ThreadStatic fails to create a truely ThreadLocal object. Basic static initializer is initialized for once, in case of ThreadStatic class.

ThreadLocal creates a wrapper of Lazy and creates a truly ThreadLocal object. Lets look into code how to build a ThreadLocal object.

public void CreateThreadLocal()
            ThreadLocal<List<float>> local = new ThreadLocal<List<float>>(() => this.GetNumberList(Thread.CurrentThread.ManagedThreadId));


            List<float> numbers = local.Value;
            foreach (float num in numbers)


        private List<float> GetNumberList(int p)
            Random rand = new Random(p);
            List<float> items = new List<float>();
            for(int i = 0; i<10;i++)
            return items;

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