更新所以完全拉了一个工具时刻。我真正的意思是参考与输出/参考。任何说“参考”的东西,我真正的意思是参考,如
一些方法(对象一些对象)
相对
SomeMethod(out someObject)
对不起。只是不想更改代码,因此答案已经有意义。
据我了解,与 ref 不同,它“复制”指针并在堆栈上创建一个新空间以使用该指针,但不会更改指针:
SomeMethod()
{
SomeThing outer = new SomeThing();
RefMethod(ref outer)
}
RefMethod(ref inner) //new space on stack created and uses same pointer as outer
{
inner.Hi = "There"; //updated the object being pointed to by outer
inner = new SomeThing();//Given a new pointer, no longer shares pointer with outer
//New object on the heap
}
Out 复制指针并可以操纵它指向的位置:
SomeMethod()
{
SomeThing outer = new SomeThing();
RefMethod(out outer)
}
RefMethod(out inner) //same pointer shared
{
inner = new SomeThing();//pointer now points to new place on heap
//outer now points to new object
//Old object is orphaned if nothing else points to it
}
对对象来说这很好而且很花哨,但是值类型怎么办,因为它们没有任何东西指向仅在堆栈上?