在 C# 中初始化结构数组
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Initializing an Array of Structs in C#
提问by Adam Tegen
How can I initialize a const / static array of structs as clearly as possible?
如何尽可能清楚地初始化结构体的 const / static 数组？
class SomeClass
{
struct MyStruct
{
public string label;
public int id;
};
const MyStruct[] MyArray = {
{"a", 1}
{"b", 5}
{"q", 29}
};
};
采纳答案by Jon Skeet
Firstly, do you reallyhave 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.
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，例如ValueTuple），但在我的经验中它们非常罕见。
Other than that, I'd just create a constructor taking the two bits of data:
除此之外，我只是创建一个带有两位数据的构造函数：
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)
});
}
Note the use of ReadOnlyCollectioninstead 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<>.)
请注意使用ReadOnlyCollection而不是公开数组本身 - 这将使其不可变，避免直接公开数组的问题。（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 的构造函数ReadOnlyCollection<>。）
回答by Winston Smith
Are you using C# 3.0? You can use object initializers like so:
你在使用 C# 3.0 吗？您可以像这样使用对象初始值设定项：
static MyStruct[] myArray =
new MyStruct[]{
new MyStruct() { id = 1, label = "1" },
new MyStruct() { id = 2, label = "2" },
new MyStruct() { id = 3, label = "3" }
};
回答by Ali Ers?z
You cannot initialize reference types by default other than null. You have to make them readonly. So this could work;
除了 null 之外，您不能默认初始化引用类型。您必须将它们设为只读。所以这可以工作；
readonly MyStruct[] MyArray = new MyStruct[]{
new MyStruct{ label = "a", id = 1},
new MyStruct{ label = "b", id = 5},
new MyStruct{ label = "c", id = 1}
};
回答by Paul Sonier
I'd use a static constructor on the class that sets the value of a static readonly array.
我会在类上使用静态构造函数来设置静态只读数组的值。
public class SomeClass
{
public readonly MyStruct[] myArray;
public static SomeClass()
{
myArray = { {"foo", "bar"},
{"boo", "far"}};
}
}
回答by Shreevardhan
Change constto static readonlyand initialise it like this
更改const到static readonly并初始化它像这样
static readonly MyStruct[] MyArray = new[] {
new MyStruct { label = "a", id = 1 },
new MyStruct { label = "b", id = 5 },
new MyStruct { label = "q", id = 29 }
};
