值类型Vs参考类型 - 对象类C＃

Question

如果值类型和引用类型来自作为引用类型的对象类型，那么值类型如何值类型和引用类型是引用它们都来自引用类型。

Answer 1

Basically, it is a cheat ;-p

Any struct (ie anything inherited from ValueType ) is treated with value-type semantics. But there is a boxing conversion to object as necessary; meaning that if you cast a struct to an object , it will create a special object (on the managed heap) containing the data (as a clone) from your value*.

The boxed version is a reference-type. You can unbox this (by casting) back to the struct version, which reverses this (copies the clones data from the object on the heap into your local value).

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*=unless it is an empty Nullable<T> , which boxes to null ; likewise, null unboxes to an empty Nullable<T> .