c# - C# 中 C++ 结构化绑定(bind)的模拟

Question

在 C++17 中，有一个非常漂亮的功能，称为结构化绑定(bind)。我很难找到它的 C# 模拟。具体来说，我的代码类似于:

public struct A
{
public int up;
public int down;
public int left;
public int right;
};
public abstract A foo();
A a = foo();
int up=a.up;
int down=a.down;
int left=a.left;
int right=a.right;

我想以一种不太冗长的方式初始化这些变量。

提前谢谢你。

Answer 1

你可以这样做:

using System;

public struct A
{
    public int up;
    public int down;
    public int left;
    public int right;
    
    public void Deconstruct(out int up, out int down, out int left, out int right)
    {
        up = this.up;
        down = this.down;
        left = this.left;
        right = this.right;
    }
};

public static class M {
    public static void main() {
        var (up,down,left,right) = new A();
    }
}

或在 C# 10 中:

using System;

record struct A(int up, int down, int left, int right);

public static class M {
    public static void main() {
        var (up,down,left,right) = new A();
    }
}