声明一个常量数组 [英] Declare a const array

问题描述

是否可以写出类似下面的内容?

Is it possible to write something similar to the following?

public const string[] Titles = { "German", "Spanish", "Corrects", "Wrongs" };

推荐答案

可以，但是需要声明为 readonly 而不是 const:

Yes, but you need to declare it readonly instead of const:

public static readonly string[] Titles = { "German", "Spanish", "Corrects", "Wrongs" };

原因是 const 只能应用于其值在编译时已知的字段.您展示的数组初始值设定项不是 C# 中的常量表达式，因此会产生编译器错误.

The reason is that const can only be applied to a field whose value is known at compile-time. The array initializer you've shown is not a constant expression in C#, so it produces a compiler error.

声明它 readonly 解决了这个问题，因为值直到运行时才被初始化(尽管它保证在第一次使用数组之前已经初始化).

Declaring it readonly solves that problem because the value is not initialized until run-time (although it's guaranteed to have initialized before the first time that the array is used).

根据您最终想要实现的目标，您还可以考虑声明一个枚举:

Depending on what it is that you ultimately want to achieve, you might also consider declaring an enum:

public enum Titles { German, Spanish, Corrects, Wrongs };

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