namespace GenericsTest{    class Program    {        // https://www.cnblogs.com/dotnet261010/p/9034594.html        static void Main(string[] args)        {            int iValue = 123;            string sValue = "456";            DateTime dtValue = DateTime.Now;            Console.WriteLine("----------------------------CommonMethod-------------------------------");            CommonMethod.showInt(iValue);            CommonMethod.showString(sValue);            CommonMethod.showDateTime(dtValue);            Console.WriteLine("----------------------------Object-------------------------------");            // Object会出现装箱和拆箱，会损耗程序的性能            CommonMethod.showObject(iValue);            CommonMethod.showObject(sValue);            CommonMethod.showObject(dtValue);            Console.WriteLine("----------------------------泛型-------------------------------");            GenericMethod.show
     
      (iValue);            GenericMethod.show
      
       (sValue);            GenericMethod.show
       
        (dtValue);            Console.WriteLine("----------------------------三种方法执行同样的操作，比较用时长短-------------------------------");            // 从结果中可以看出：泛型方法的性能最高，其次是普通方法，object方法的性能最低。            MonitorMethod.Show();            Console.ReadKey();        }    }}namespace GenericsTest{    public class CommonMethod    {        /// 
        
        /// 打印个int值        /// 
        /// 
                public static void showInt(int iParameter)        {            Console.WriteLine("This is {0}, parameter = {1}, type = {2}.",                typeof(CommonMethod).Name, iParameter.GetType().Name, iParameter);        }        /// 
        
        /// 打印个string值        /// 
        /// 
                public static void showString(string sParameter)        {            Console.WriteLine("This is {0}, parameter = {1}, type = {2}.",               typeof(CommonMethod).Name, sParameter.GetType().Name, sParameter);        }        //、打印个DateTime值        public static void showDateTime(DateTime dtParameter)        {            Console.WriteLine("This is {0}, parameter = {1}, type = {2}.",               typeof(CommonMethod).Name, dtParameter.GetType().Name, dtParameter);        }        /// 
        
        /// 上面的三个例子进行优化        /// 
        /// 
                public static void showObject(object oParameter)        {            Console.WriteLine("This is {0}, parameter = {1}, type = {2}.",               typeof(CommonMethod).Name, oParameter.GetType().Name, oParameter);        }    }}namespace GenericsTest{    class GenericMethod    {        public static void show
        
         (T tParameter)        {            Console.WriteLine("This is {0}, parameter = {1}, type = {2}.",                typeof(GenericMethod).Name, tParameter.GetType().Name, tParameter.ToString());        }    }} namespace GenericsTest{    class MonitorMethod    {        public static void Show()        {            int iValue = 12345;            long commonSecond = 0;            long objectSecond = 0;            long genericSecond = 0;            {                Stopwatch watch = new Stopwatch();                watch.Start();                for (int i = 0; i < 100000000; i++)                {                    ShowInt(iValue);                }                watch.Stop();                commonSecond = watch.ElapsedMilliseconds;            }            {                Stopwatch watch = new Stopwatch();                watch.Start();                for (int i = 0; i < 100000000; i++)                {                    ShowObject(iValue);                }                watch.Stop();                objectSecond = watch.ElapsedMilliseconds;            }            {                Stopwatch watch = new Stopwatch();                watch.Start();                for (int i = 0; i < 100000000; i++)                {                    Show
         
          (iValue);                }                watch.Stop();                genericSecond = watch.ElapsedMilliseconds;            }            Console.WriteLine("commonSecond={0},objectSecond={1},genericSecond={2}."                , commonSecond, objectSecond, genericSecond);        }        #region PrivateMethod        private static void ShowInt(int iParameter)        {            //do nothing        }        private static void ShowObject(object oParameter)        {            //do nothing        }        private static void Show
          
           (T tParameter) { //do nothing } #endregion }}