blocks|key|893948|text|type|unstyled|depth|inlineStyleRanges|entityRanges|data|893949|如果我将扩展方法添加到程序中，会对程序性能产生多大的影响？它的工作速度会变慢，还是加载速度会变慢？|blockquote|893950|893951|893952|不会影响性能。扩展方法是真正的静态方法。|893953|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|-4|4|5|6|J|7|@]|8|@]|9|$]]|$1|A|3|B|4|C|6|K|7|@]|8|@]|9|$]]|$1|D|3|-4|4|5|6|L|7|@]|8|@]|9|$]]|$1|E|3|-4|4|5|6|M|7|@]|8|@]|9|$]]|$1|F|3|G|4|5|6|N|7|@]|8|@]|9|$]]|$1|H|3|-4|4|5|6|O|7|@]|8|@]|9|$]]]|I|$]]

<blockquote>
 How much will it cost for my programs
 performance if i add Extension methods
 to it? Will it work slower or may be
 will load slower?
</blockquote>

There will be no performance hit. Extension methods are really static methods.

blocks|key|2750155|text|它肯定不会加载更慢，因为加载程序不依赖于程序中的执行路径。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2750156|至于跑得更慢呢？只有测量扩展方法和非扩展方法所用的时间才能确定。我怀疑，即使它实际上是可测量的，差异也不会很大。|2750157|重要的考虑因素应该始终是“扩展方法是否使我的代码更清晰、更易于理解和维护”。|2750158|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

It certainly won't load slower, as loading a program is not dependent on the execution paths in the program.

As for running more slowly? Only measuring the time taken for the extension method and the non-extension method will show for certain. I suspect the difference won't be significant even if it's actually measurable.

The important consideration should always be "does the extension method make my code clearer and easier to understand and maintain".

blocks|key|2750188|text|扩展方法只是应用于静态方法的语法糖。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2750189|从理论上讲，静态方法比非虚拟实例方法更快(不需要检查空this)，而非虚拟实例方法又比虚拟实例方法更快(不需要查找实现来调用)。|offset|length|style|CODE|2750190|从理论上讲，优化也可以消除这些差异。当涉及到扩展方法时，它在静态方面也被夸大了，因为对象可能会以一种需要null检查的方式来处理(无论是显式的还是隐式的)。|2750191|在实践中，无论扩展方法做什么，无论它是扩展还是实例，都有可能产生更大的影响。|2750192|entityMap^0|0|R|4|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@$D|P|E|Q|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|R|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|S|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|M|$]]

An extension method is just syntactic sugar applied to a static method.

In theory, a static method is faster than a non-virtual instance method (no need to check for null <code>this</code>) which in turn is faster than a virtual instance method (no need for looking up the implementation to call).

In theory also, optimisations could get rid of these differences. It's also overstated in terms of static when it comes to extension methods, since the object is probably going to be dealt with in such a way as requires a null-check (whether explicit or implicit to the ways it is use) anyway.

In practice, the chances are that whatever the extension method does will have much, much more of an impact that whether it's extension or instance.

blocks|key|891777|text|我在一个真正长时间运行的循环中使用一些整数扩展方法快速地对此进行了性能测试，发现在我测试的情况下，性能通常是相同的。当调试或运行未优化的程序集时，扩展方法的运行速度大约是我的控件用例的两倍，这是有意义的，因为调试器不能内联这些方法，并且必须跟踪调用堆栈等。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|891778|因此，在准备发布的程序集中，没有性能损失。|891779|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

I quickly performance tested this using some integer extension methods in a REALLY long running loop and found that in the cases I tested, the performance was generally identical. When debugging or running unoptimized assemblies, extension methods ran about twice as slowly as my control cases, this makes sense because the debugger can't inline these methods and has to keep track of the callstack, etc.

So, in an assembly ready for release, no performance penalty.

How much will it cost for my programs performance if i add Extension methods to it? 
Will it work slower or may be will load slower? 
Thanks.

Are Extension methods too expensive?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

文章

问答

视频

学习中心

腾讯云实验室

直播

竞赛

腾讯云代码分析专区

腾讯iOA零信任安全管理系统专区

腾讯云架构师技术同盟交流圈

腾讯云数据库专区

腾讯云顾问专区

腾讯云原生专区

腾讯混元专区

腾讯云TCE专区

腾讯云Lighthouse专区

腾讯云HAI专区

腾讯云Edgeone专区

腾讯云存储专区

腾讯云智能专区

腾讯轻联专区 

腾讯云开发专区

TAPD专区

腾讯轻量云游戏服专区

腾讯云最具价值专家

腾讯云架构师技术同盟

腾讯云创作之星

腾讯云开发者先锋

腾讯云代码助手

云原生构建

TAPD 敏捷项目管理

Cloud Studio

SDK中心

API中心

命令行工具

涵盖代码开发、场景应用、自动测试全流程，助你从零构建专属AI助手

一站式MCP教程库，解锁AI应用新玩法

如果我给我的程序添加扩展方法，我的程序性能会有多大的损失？它的工作速度会变慢，还是加载速度会变慢？谢谢。

问扩展方法太昂贵了吗？
EN

Stack Overflow用户

社区

活动

圈层

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问扩展方法太昂贵了吗？EN