static int maxNum = 1000000;        static StringBuilder sbIsThreadSafe = new StringBuilder();        static void Main(string[] args)        {            //迭代次数            int iterationNum = 3;            CodeTimer.Initialize();                       CodeTimer.Time("StringBuilder是否是线程安全的呢？", iterationNum, new Action(SBIsThreadSafe));            //Console.Write(sbIsThreadSafe.ToString());            Console.Read();        }        private static void SBIsThreadSafe()        {            Parallel.For(1, maxNum / 2, (i) =>            {                sbIsThreadSafe.Append(i.ToString());            });            Parallel.For(maxNum / 2 + 1, maxNum, (i) =>            {                sbIsThreadSafe.Append(i.ToString());            });        }