自测装箱/拆箱

结果：
time1:00:00:00.3
time2:00:00:01.5
--------------------------
代码：
object obj = null;
int iTest = -1;
int iRet = -1;

DateTime dt1 = System.DateTime.Now;

for(int i=0;i<iCount;i++)
{
    iTest = i;
    iRet = iTest;
}

TimeSpan time1 = System.DateTime.Now.Subtract(dt1);

Console.WriteLine("time1:"+time1.ToString());

DateTime dt2 = System.DateTime.Now;

for(int j=0;j<iCount;j++)
{
    obj = j;
    iRet = (int)obj;
}

TimeSpan time2 = System.DateTime.Now.Subtract(dt2);

Console.WriteLine("time2:"+time2.ToString());
Console.Read();