Question Mono Behavior in List

I don't understand. It uses MonoBehavior as the data type in the list and puts null in it????

How to find out then how many objects are in the List and what does it depend on??? And what does null do here? I don't know c# well

 

rger

 

Should you not just be assigning to

CachedInteractions

, and not

Interactions

?

 

This is not my script. I just don't understand what happend, when we make MonoBehavior in <List> as a data type

 

List<T>

is a reference type. Ergo, the field is just a pointer, or reference, to the actual object stored somewhere in memory. Like all reference types, it can be 'null' in that it points to nothing.

 

Like Spiney said, the code should actually assign the new List to the "CachedInteractions" variable as it's not possible to assign it to a read-only property.

This is essentially a lazy initialized property. The actual variable CachedInteractions is protected and set to null. When the Interactions property is used for the first time (in that case "CachedInteractions" is null) the getter of the property will create and fill the list with all components on the same gameobject that match a certain type (this is still missing in the shot you've shown).

If this is a tutorial that you're following and they don't explain the "why", it's a bad tutorial.

 

It just looks like an overcomplicated idea. In Unity, if you want to cache you use ScriptableObjects (derived class like MonoBehaviour). Next, you can make many copies of such type that work like any asset, so you can drag and drop it in the place you need.