获取对数组内部结构的引用 [英] Get a reference to a struct inside array

问题描述

我想修改数组内结构的字段，而不必设置整个结构.在下面的示例中，我想在数组中设置元素 543 的一个字段.我不想复制整个元素(因为复制 MassiveStruct 会影响性能).

I want to modify a field of a struct which is inside an array without having to set entire struct. In the example below, I want to set one field of element 543 in the array. I don't want to have to copy entire element (because copying MassiveStruct would hurt performance).

class P
{
    struct S
    {
      public int a;
      public MassiveStruct b;
    }

    void f(ref S s)
    {
      s.a = 3;
    }

    public static void Main()
    {
      S[] s = new S[1000];
      f(ref s[543]);  // Error: An object reference is required for the non-static field, method, or property
    }
}

有没有办法在 C# 中做到这一点?还是我总是必须从数组中复制整个结构，修改副本，然后将修改后的副本放回数组中.

Is there a way to do it in C#? Or do I always have to copy entire struct out of array, modify the copy, and then put the modified copy back into array.

推荐答案

唯一的问题是您试图从静态方法调用 实例 方法，而没有 的实例P.

The only problem is that you're trying to call an instance method from a static method, without an instance of P.

使 f 成为一个静态方法(或创建一个 P 的实例以在其上调用它)就可以了.这都是关于阅读编译器错误:)

Make f a static method (or create an instance of P on which to call it) and it'll be fine. It's all about reading the compiler error :)

话虽如此，我强烈建议您:

• 尽可能避免创建大量结构
• 尽可能避免创建可变结构
• 避免使用公共字段

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