如何在不使用C#创建新对象的情况下修改装箱的值? [英] How to modify the boxed value without creating a new object in C#?

问题描述

如何在不使用C#创建新对象的情况下修改装箱的值?

How to modify the boxed value without creating a new object in C#?

例如如果我有object o = 5;，并且想将装箱的5的值更改为6，该怎么办?

E.g. if I have object o = 5; and I want to change the value of the boxed 5 to 6, how can I do that?

o = 6;将在堆上创建一个新对象，并将对该对象的引用分配给o.还有其他更改框值的方法吗?

The o = 6; will create a new object on the heap and assign the reference to that object to the o. Are there any other ways to change the boxed value?

推荐答案

您可以自己进行装箱"，而不是对其进行修改.

You can do the "boxing" yourself, than you can modify it.

class Box
{
     public int Value { get;set;}
}

这可防止自动装箱.

如果您将自己定义为转换运算符

If you define yourself an conversion operator

     public static Box operator(int value) => new Box() { Value = value }

您可以保留与上面相同的语法.但是，此语法将创建一个新对象，如您所见.要修改对象，您必须

You can keep the same syntax as above. But this syntax will create a new object as you see. To modify the object, you would have to

  Box b = 5;
  object o = b;
  ((Box)o).Value = 6;
 // or
  b.Value = 6;

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