线程安全：
class Program
    {
        public delegate void MyDelegate(string aa);
        static void Main(string[] args)
        {
            MyDelegate dele = new MyDelegate(LockTest);
            MyDelegate dele1 = new MyDelegate(LockTest);
            dele.BeginInvoke("aa", null,null);
            dele1.BeginInvoke("aa", null, null);
            Console.ReadKey();
        }

        private static void LockTest(string aa)
        {
            string thisServiceLock = string.Intern(aa+"_lockCheck");
            lock (thisServiceLock)
            {
                Console.WriteLine("线程ID" + Thread.CurrentThread.ManagedThreadId.ToString());
                Thread.Sleep(10000);
                Console.WriteLine("线程ID" + Thread.CurrentThread.ManagedThreadId.ToString());
            }
        }
    }