protected static object MObjLock = new object();//同步锁        public string GetData(int mId)        {            Monitor.Enter(MObjLock);//lock            string data = http://www.mamicode.com/string.Empty;            try            {                 //你的代码                

            }            catch (Exception err)            {                Log4NetHelper.WriteError(err);            }            finally            {                Monitor.Exit(MObjLock);//unlock            }            return data;        }