C#中的内存泄漏问题

我是C#程序员.我担心的是内存泄漏.因为它在我的程序中很关键.

我知道在这种情况下:
obj1 = {parent = null，child = obj2}
obj2 = {parent = obj1，child = null}
其中obj1是全局对象，而obj2是局部对象，此代码:

Hi,
I''m a c# programmer. And the thing I''m concern about is memory leak. Because it is critical in my program.

I know in this case:
obj1={ parent=null, child=obj2 }
obj2={ parent=obj1, child=null }
where obj1 is a global object and obj2 is a local object, this code:

obj1.child = null;

导致删除obj2.

但是我怀疑以下代码是否会删除obj2和obj3?因为他们两个仍然指向对方:
obj1 = {parent = null，child = obj2}
obj2 = {父代= obj1，子代= obj3}
obj3 = {parent = obj2，child = null}

causes removing obj2.

But I''m doubtful if following code results removing obj2 and obj3 or not? because both of them still point each other:
obj1={ parent=null, child=obj2 }
obj2={ parent=obj1, child=obj3 }
obj3={ parent=obj2, child=null }