1. 问题
请计算下列代码执行所耗费的时间，给出通用的解决方法？
List<Int32> myList=new List<Int32>();
for(Int32 i=0;i<ICount;i++)
{
myList.Add(i);
}
2. 解决方法
using (OperationTimer op=new OperationTimer ("Generic "))
{
List<Int32> myList=new List<Int32>();
for(Int32 i=0;i<ICount;i++)
{
myList.Add(i);
}
}
}
OperationTimer 类会在调用构造函数时取得时间t1,在调用Dispose（）取得时间t2,中间过程耗费的时间=t2-t1. Using 语法会在using 块的末尾调用using中声明对象的Dispose方法。
3. 代码
using System;
using System.Diagnostics;
using System.Collections;
using System.Collections.Generic;
namespace genericApp
{
///计时辅助类
public class OperationTimer:IDisposable{
private Int64 m_startTime;
private string m_text;
private Int32 m_CollectionCount;
public OperationTimer(string text)
{
m_startTime=Stopwatch.GetTimestamp();
m_text=text;
}
public void Dispose()
{
string text=string.Format("Time={0,6:###.00}",(Stopwatch.GetTimestamp()-m_startTime)/Stopwatch.Frequency);
Console.WriteLine(string.Format("{0}:{1}",m_text,text));
}
}
class MainClass
{
public static void Main(string[] args)
{
ValueTypePerfermanceTest();
Console.Read();
}
static void ValueTypePerfermanceTest()
{
const Int32 ICount=20000000;
using (OperationTimer op=new OperationTimer ("Generic "))
{
List<Int32> myList=new List<Int32>();
for(Int32 i=0;i<ICount;i++)
{
myList.Add(i);
}
}
using (OperationTimer op2=new OperationTimer ("ArrayList "))
{
ArrayList myList=new ArrayList();
for(Int32 i=0;i<ICount;i++)
{
myList.Add(i);
}
}
}
}
}
4. Mono 2.4 中的运行结果
