C# 对象可以为“null”但仍具有属性吗？

Question

I have an object for which I can print its properties (like 'name', 'id',...) in a debug console. On the very next line, I print the object itself, and there I get 'null'. Kind of like this:

Debug.Log($"Item name is {item.name}");
Debug.Log($"Item is {item}");
if (item == null)
{
    Debug.Log("Yes, item is null!");
}

So the first line will print a correct name, the second prints 'null'. The third line prints "Yes, item is null!".

How is that possible? (I don't know if this is relevant, but this happens in a code for Unity.)

Thank you, Arnaud.

Answer 1

That's because UnityEngine.Object overload == , != and bool operators.

https://docs.unity3d.com/ScriptReference/Object-operator_eq.html

A Unity object will equal to null after it is destroyed, but you can still access part of its properties.

You can use the following condition to check whether a Unity object is completely null or not.

(object)item == null