Getting variable from sub class?

So i'm not the best at c# where i get a bit confused at is a class inside the main class such as

Code:

class Tsuntest : RustPlugin
    {
    //a megafuckton of things that have to do with other things such as the plane.
    // BaseEntity plane = stuff; etc etc
       class Player : MonoBehaviour{
            public BasePlayer player;
            public bool inplane;
            public BaseEntity planeentity;
    }
}

Now where i'm confused is how can i get the plane entity from the main class to be access in the Player class.

TLDR i want the planeentity to equal plane, but when i tried player.gameObject.AddComponent<Player>().planeentity= plane; that didn't work at all.

 

Code:

var component = player.gameObject.AddComponent<Player>();
component.planeentity = plane;

 

That made me more confused. (this was just to test it out)
Why would this not work

Code:

            var component = player.gameObject.AddComponent<Player>();
            component.planeentity = plane;
            rust.RunServerCommand("say "+player.gameObject.AddComponent<Player>().planeentity+" / "+plane);

but this would

Code:

            var component = player.gameObject.AddComponent<Player>();
            component.planeentity = plane;
            rust.RunServerCommand("say "+component.planeentity+" / "+plane);

 

Code:

player.gameObject.AddComponent<Player>(); // Adds the component to the player
Player component = player.gameObject.AddComponent<Player>(); // Same as above but gives your a reference to that component
component.planeentity = plane; // Set the field for the specified component, in this case a plane

Code:

var component = player.gameObject.AddComponent<Player>();
            component.planeentity = plane;
            rust.RunServerCommand("say "+player.gameObject.AddComponent<Player>().planeentity+" / "+plane);

You can only add 1 instance of a specific component type to a object. If you want to get the instance of a component on a object you use GetComponent<Type>()

 

That makes sense thanks a lot =)

 

WTF? Why 1 instance, i have in unity more instance of specific component