http://blogs.msdn.com/b/kevin_ransom/archive/2004/04/19/116072.aspxRecently email was forwarded to me with a link to a page with some performance tips for developers. The second performance tip on the page was: foreach foreach through an array is incredibly slow compared to for (int i = 0; i &lt;en-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)http://blogs.msdn.com/b/kevin_ransom/archive/2004/04/19/116072.aspx#8710370Wed, 09 Jul 2008 02:56:33 GMT91d46819-8472-40ad-a661-2c78acb4018c:8710370Technical Musings<p>Although very handy, C#&amp;#39;s foreach statement is actually quite dangerous. In fact, I may swear off its use entirely. Why? Two reasons: (1) performance, and (2) predictability....</p> <img src="http://blogs.msdn.com/aggbug.aspx?PostID=8710370" width="1" height="1">http://blogs.msdn.com/b/kevin_ransom/archive/2004/04/19/116072.aspx#4280478Tue, 07 Aug 2007 20:22:22 GMT91d46819-8472-40ad-a661-2c78acb4018c:4280478cnblogs.com<p>事实上对Array进行foreach的时候根本不会调用GetEnumerator()方法, 也就是被编译器给内联了. 而对于List&amp;lt;&amp;gt;, 虽然没有编译器内联GetEnumerator()</p> <img src="http://blogs.msdn.com/aggbug.aspx?PostID=4280478" width="1" height="1">http://blogs.msdn.com/b/kevin_ransom/archive/2004/04/19/116072.aspx#4082930Fri, 27 Jul 2007 19:30:19 GMT91d46819-8472-40ad-a661-2c78acb4018c:4082930holyrong<p>for和foreach 的效率问题是个老问题了，从网上看到的是众说纷纭，有说for效率高的也有说foreach效率高的，还有说测试方法有问题的；通过实验发现for的效率比foreach高。</p> <img src="http://blogs.msdn.com/aggbug.aspx?PostID=4082930" width="1" height="1">http://blogs.msdn.com/b/kevin_ransom/archive/2004/04/19/116072.aspx#694422Thu, 10 Aug 2006 18:14:46 GMT91d46819-8472-40ad-a661-2c78acb4018c:694422Better Living through Software » Blog Archive » Loopy DecisionsPingBack from <a rel="nofollow" target="_new" href="http://www.netcrucible.com/blog/2004/04/21/loopy-decisions-2/">http://www.netcrucible.com/blog/2004/04/21/loopy-decisions-2/</a><img src="http://blogs.msdn.com/aggbug.aspx?PostID=694422" width="1" height="1">http://blogs.msdn.com/b/kevin_ransom/archive/2004/04/19/116072.aspx#694419Thu, 10 Aug 2006 18:14:31 GMT91d46819-8472-40ad-a661-2c78acb4018c:694419Better Living through Software » Blog Archive » Loopy DecisionsPingBack from <a rel="nofollow" target="_new" href="http://www.netcrucible.com/blog/2004/04/21/loopy-decisions/">http://www.netcrucible.com/blog/2004/04/21/loopy-decisions/</a><img src="http://blogs.msdn.com/aggbug.aspx?PostID=694419" width="1" height="1">http://blogs.msdn.com/b/kevin_ransom/archive/2004/04/19/116072.aspx#426003Tue, 07 Jun 2005 11:10:12 GMT91d46819-8472-40ad-a661-2c78acb4018c:426003- TrIpLeZoNe -Here are some resources to read up on the differences between 'for' and 'foreach'. <br>Enumerating array...<div style="clear:both;"></div><img src="http://blogs.msdn.com/aggbug.aspx?PostID=426003" width="1" height="1">http://blogs.msdn.com/b/kevin_ransom/archive/2004/04/19/116072.aspx#270360Thu, 25 Nov 2004 19:31:00 GMT91d46819-8472-40ad-a661-2c78acb4018c:270360Andrea Piccoli's blog<div style="clear:both;"></div><img src="http://blogs.msdn.com/aggbug.aspx?PostID=270360" width="1" height="1">http://blogs.msdn.com/b/kevin_ransom/archive/2004/04/19/116072.aspx#249550Fri, 29 Oct 2004 16:02:00 GMT91d46819-8472-40ad-a661-2c78acb4018c:249550dotRob<div style="clear:both;"></div><img src="http://blogs.msdn.com/aggbug.aspx?PostID=249550" width="1" height="1">http://blogs.msdn.com/b/kevin_ransom/archive/2004/04/19/116072.aspx#248077Tue, 26 Oct 2004 23:04:00 GMT91d46819-8472-40ad-a661-2c78acb4018c:248077Omer van Kloeten's .NET Zen<div style="clear:both;"></div><img src="http://blogs.msdn.com/aggbug.aspx?PostID=248077" width="1" height="1">http://blogs.msdn.com/b/kevin_ransom/archive/2004/04/19/116072.aspx#131997Fri, 14 May 2004 19:05:00 GMT91d46819-8472-40ad-a661-2c78acb4018c:131997Bryant Likes's Blog<div style="clear:both;"></div><img src="http://blogs.msdn.com/aggbug.aspx?PostID=131997" width="1" height="1">