何时使用Enum或Class [英] When to use Enum or Class

问题描述

在这里，我有3个应用程序状态，并且它具有固定的值.枚举或类常量的最佳方法是什么?

Here I have 3 application status, and it has a fixed values. What is the best way to do this, enum or class constants?

public enum Status
        {
            ENTERED = 1,
            APPROVED = 2,
            CANCELLED = 3
        };

public class Status
{
    public const int ENTERED  = 1;
    public const int APPROVED = 2;
    public const int CANCELLED = 3;
}

When to use enum and constant variable?

推荐答案

枚举.
如果您不担心特定的值，则可以使用枚举来确保它们不相同-为此使用类取决于您正确地做到这一点.

Enum.
If you are not worried about the particular values, then using an enum allows you to let it ensure that they are not the same - using a class for this relies on you getting it right.

public enum Status
        {
            ENTERED,
            APPROVED,
            CANCELLED
        };

另外，枚举是值类型，而不是引用类型，并且比类(具有构造函数等)在整个系统上的开销更少.

当您需要特定的数据类型时，请使用常量值:浮点数，字符串，字符-枚举只能是枚举(但可以通过在枚举定义中指定char来使用除char以外的任何整数基类型)

In addition an enum is a value type, rather than a reference type, and put less overhead on the whole system than a class (which has a constructor, etc.)

Use constant values when you need specific data types: floats, strings, characters - and enum can only be an enum (but you can use any of the integral base types except char by specifying it in the enum definition)

这篇关于何时使用Enum或Class的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！