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Question by RoR · Feb 17, 2011 at 05:23 PM · programmingnullreferenceexceptioninheritance

Inheritance in C# and Unity3d

So in my base class, I have a variable that is :

public GameSystem GS; // reference to a GameSystem

 // Use this for initialization
 void Start () {
       GS = (GameSystem)GameObject.Find("Manager").GetComponent("GameSystem");
 }

Why is GS not available to be used in the sub classes? I get an error of :

NullReferenceException: Object reference not set to an instance of an object TargetControl.OnMouseDown () (at Assets/Scripts/TargetControl.cs:37) UnityEngine.SendMouseEvents:DoSendMouseEvents()ne.SendMouseEvents:DoSendMouseEvents()

But if I made functions inside of my base class, they are available to my sub-classes. Why is GS not?

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avatar image burnumd · Feb 17, 2011 at 05:37 PM 1
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Can I interest you in using the generic version of GetComponent? GS = (GameSystem)GameObject.Find("$$anonymous$$anager").GetComponent (); It's significantly faster and less likely to promote runtime errors.

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Answer by burnumd · Feb 17, 2011 at 05:31 PM

The error you're getting seems more like GS is not getting set. Are you overriding Start in your subclass and not calling base.Start ()?

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