关于Duck Typing的性能分析 - Draft

using System;
using System.Threading;
using System.Collections.Generic;
using System.Diagnostics;

namespace DuckTyping
{

class Program
{
public static int Range = 10000000;

static void Main(string[] args)
{
string newRange = Console.ReadLine();
if (!string.IsNullOrEmpty(newRange))
{
Range
= Int32.Parse(newRange);
}

FakeEnumerable fake
= new FakeEnumerable();
RealEnumerable real
= new RealEnumerable();
YieldEnumerable
yield = new YieldEnumerable();

Stopwatch sw
= new Stopwatch();
sw.Start();

foreach (var item in fake)
{
}

sw.Stop();
Console.WriteLine(
"Duck Typing : {0}",sw.ElapsedMilliseconds);
sw.Reset();
sw.Start();

foreach (var item in real)
{
}

sw.Stop();
Console.WriteLine(
"Interface compl: {0}", sw.ElapsedMilliseconds); sw.Reset();
sw.Reset();
sw.Start();

foreach (var item in yield)
{
}

sw.Stop();
Console.WriteLine(
"Yield compl: {0}", sw.ElapsedMilliseconds);


Console.ReadKey();
}
}

public class FakeEnumerable
{
public FakeEnumerator GetEnumerator()
{
return new FakeEnumerator();
}
}

public class FakeEnumerator
{
public FakeEnumerator()
{
this.Current = 1;
}

public int Current {get;set;}

public bool MoveNext()
{
Current
++;
return Current < Program.Range;
}
}

public class RealEnumerable : IEnumerable<int>
{
public IEnumerator<int> GetEnumerator()
{
return new RealEnumerator();
}

System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
{
throw new NotImplementedException();
}
}

public class RealEnumerator : IEnumerator<int>
{
private int current;

public RealEnumerator()
{
this.current = 0;
}

public int Current
{
get { return this.current; }
}

public void Dispose()
{
}

object System.Collections.IEnumerator.Current
{
get { return this.current; }
}

public bool MoveNext()
{
current
++;
return current < Program.Range;
}

public void Reset()
{
throw new NotImplementedException();
}
}

public class YieldEnumerable : IEnumerable<int>
{
private static int index = 0;

public IEnumerator<int> GetEnumerator()
{
while (index < Program.Range)
yield return index++;
}

System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
{
throw new NotImplementedException();
}
}
}

作者:Jeffrey Sun
出处:http://sun.cnblogs.com/
本文以“现状”提供且没有任何担保,同时也没有授予任何权利。本文版权归作者所有,欢迎转载,但未经作者同意必须保留此段声明,且在文章页面明显位置给出原文连接,否则保留追究法律责任的权利。

posted @ 2011-07-04 21:15  Jeffrey Sun  阅读(582)  评论(3编辑  收藏  举报