c# - C#中的指针替代

Question

我需要 C# 中类似 C/C++ 的指针的替代方法，以便我可以存储在构造函数中传递的变量的引用。我希望我的本地指针在每次引用值更改时更改其值。就像一个指针。但我不想在 C# 中使用真正的指针，因为它们不安全。有解决方法吗？

    class A
    {
        public Int32 X = 10;
    }

    class B
    {
        public B(Int32 x)
        {
            Y = x;
        }

        public Int32 Y { get; set; }
    }
    static void Main(string[] args)
    {
        A a = new A();
        B b = new B(a.X);

        Console.WriteLine(b.Y); // 10
        a.X = 11;
        Console.WriteLine(b.Y); // 10, but I want it to be 11
    }

Answer 1

忘掉指针，开始用 C# 思考，同时用 C# 编码:D

我会做这样的事情:

public interface IXProvider
{
     int X {get;}
}

class A : IXProvider
{
    public int X {get; set;} = 10;
}

class B
{
    public B(IXProvider x)
    {
        _x = x;
    }

    private readonly IXProvider _x;
    public int Y => _x.X;
}

static void Main(string[] args)
{
    A a = new A();
    B b = new B(a);

    Console.WriteLine(b.Y); // 10
    a.X = 11;
    Console.WriteLine(b.Y); // 11
}

位图示例:(为简单起见，假设“SomeBitmap”和“AnotherBitmap”是实际位图)

public interface IBitmapProvider
{
     Bitmap X {get;}
}

class A : IBitmapProvider
{
    public Bitmap X {get; set;} = SomeBitmap;
}

class B
{
    public B(IBitmapProvider x)
    {
        _x = x;
    }

    private readonly IBitmapProvider _x;
    public Bitmap Y => _x.X;
}

static void Main(string[] args)
{
    A a = new A();
    B b = new B(a);

    Console.WriteLine(b.Y); // SomeBitmap
    a.X = AnotherBitmap;
    Console.WriteLine(b.Y); // AnotherBitmap
}