在 C# 中初始化结构数组 [英] Initializing an Array of Structs in C#

问题描述

如何尽可能清晰地初始化结构体的常量/静态数组?

How can I initialize a const / static array of structs as clearly as possible?

class SomeClass
{

    struct MyStruct
    {
        public string label;
        public int id;
    };

    const MyStruct[] MyArray = {
          {"a", 1}
          {"b", 5}
          {"q", 29}
    };
};

推荐答案

首先，你真的必须有一个可变结构吗?他们几乎总是一个坏主意.同样是公共领域.在某些非常偶然的情况下，它们是合理的(通常将两个部分放在一起，如 ValueTuple)，但在我的经验中它们非常罕见.

Firstly, do you really have to have a mutable struct? They're almost always a bad idea. Likewise public fields. There are some very occasional contexts in which they're reasonable (usually both parts together, as with ValueTuple) but they're pretty rare in my experience.

除此之外，我只需要创建一个构造函数来获取两位数据:

Other than that, I'd just create a constructor taking the two bits of data:

class SomeClass
{

    struct MyStruct
    {
        private readonly string label;
        private readonly int id;

        public MyStruct (string label, int id)
        {
            this.label = label;
            this.id = id;
        }

        public string Label { get { return label; } }
        public string Id { get { return id; } }

    }

    static readonly IList<MyStruct> MyArray = new ReadOnlyCollection<MyStruct>
        (new[] {
             new MyStruct ("a", 1),
             new MyStruct ("b", 5),
             new MyStruct ("q", 29)
        });
}

注意使用 ReadOnlyCollection 而不是公开数组本身 -这将使它不可变，避免问题直接暴露数组.(代码显示确实初始化了一个结构数组 - 然后它只是将引用传递给 ReadOnlyCollection<> 的构造函数.)

Note the use of ReadOnlyCollection instead of exposing the array itself - this will make it immutable, avoiding the problem exposing arrays directly. (The code show does initialize an array of structs - it then just passes the reference to the constructor of ReadOnlyCollection<>.)

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