何时在实例类上使用静态类的准则? [英] Guidelines for when to use Static class over instance class?
问题描述
可能重复:
何时在C#中使用静态类
Possible Duplicate:
When to Use Static Classes in C#
有人可以提供有关创建时间的指南，标准检查点 静态类以及何时创建实例类.
Can someone please provide guidelines , standard checkpoints on when to create static class and when to create instance class.
基本上，我在编写代码时看到很多次，而使用静态类和方法可以完成相同的事情，这让我感到困惑.
Basically many a times I see while writing a code that the same thing could have been done using static class and methods and i get confused with many things.
到目前为止，我知道以下检查要点:
So far i know below check points :
-
如果所考虑的对象在整个应用程序中只能存在一次，那么它将属于静态"
If object under the consideration can exists only once in entire application then it would come under "static"
如果方法内部不使用任何字段变量，则它可以是静态方法.
If a method does not use any field variable inside it then it can be static method.
推荐答案
在我看来，最好的区分因素是状态.
To my mind the best differentiator is state.
如果您的类没有状态，而只是一系列相关的方法，当给定输入时，它们将为您提供输出，那么您就很适合使用静态类.
If your class has no state and is just a series of related methods that, when given an input, will give you an output then you have an excellent candidate for a static class.
如果将为您的班级提供输入然后进行存储，或者希望以其他方式保持班级的当前状态，则您有一个普通班级.
If your class will be given input and then store it or in some other way will be expected to maintain its current state then you have a regular class.
此外，如果您的类要声明为abstract或要从另一个类继承行为或从接口实现行为，那么您将远离静态类并拥有一个普通的类.
Furthermore if your class is going to be declared abstract or is going to inherit behaviours from another class or implement behaviours from an interface, then you're moving away from a static class and have a normal class.
简而言之:
- 如果它是一袋方法或没有状态
- 和它不是抽象的，继承或实现接口的
- If it's a bag of methods or has no state
- and it isn't abstract, inheriting or implementing an interface
那么您很有可能是静态类:)
Then you have a good chance it is a static class :)
我希望能帮上忙.
NB(根据下面的敏锐注释)状态是指存储一些数据的类，这些数据表示对象的当前事务状态.也许是类级变量或属性.
NB (as per the astute comment below) state refers to the class storing some data that represents the current state-of-affairs for an object. Perhaps a class-level variable or a property.
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