方法可静态的，而应该吗？ [英] Method can be made static, but should it?

问题描述

ReSharper的喜欢指出每可能进行静态asp.net页面多种功能。它是否帮助我，如果我这样做让他们静？我应该让他们静并将其移动到一个工具类？

Resharper likes to point out multiple functions per asp.net page that could be made static. Does it help me if I do make them static? Should I make them static and move them to a utility class?

推荐答案

静态方法与实例方法
10.2.5静态和实例成员中的C＃语言规范的解释差分。一般来说，静态方法可以提供一个非常小的性能提升（更不用说节省内存根据实例类可能希望创建数）以上的实例方法，但只是在有些极端的情况下。

Static methods versus Instance methods
10.2.5 Static and instance members of the C# Language Specification explains the difference. Generally, static methods can provide a very small performance enhancement (not to mention a memory saving depending on the number of instances your class might expect to create) over instance methods, but only in somewhat extreme situations.

在的FxCop规则CA1822或code分析指出：

Rule CA1822 in FxCop or Code Analysis states:

后[标记成员静态]，编译器将发出非虚拟调用点到这些成员将prevent一张支票   运行时每个调用，以确保当前对象的指针   非空。这会导致可观的性能增益   性能敏感的code。在某些情况下，失败访问   再$ P $当前对象实例psents一个正确的问题。的

"After [marking members as static], the compiler will emit non-virtual call sites to these members which will prevent a check at runtime for each call that ensures the current object pointer is non-null. This can result in a measurable performance gain for performance-sensitive code. In some cases, the failure to access the current object instance represents a correctness issue."

工具类
你不应该将它们移到一个实用程序类，除非它是有道理的在您的设计。如果静态方法涉及到一个特定的类型，像一个ToRadians（双学位）方法涉及一类重presenting的角度，这是有道理的，该方法存在作为该类型（注：静态成员，这是一个令人费解的例子演示的目的）。

Utility Class
You shouldn't move them to a utility class unless it makes sense in your design. If the static method relates to a particular type, like a ToRadians(double degrees) method relates to a class representing angles, it makes sense for that method to exist as a static member of that type (note, this is a convoluted example for the purposes of demonstration).

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