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Question by SinisterRainbow · Oct 22, 2013 at 08:15 AM · componentconverttypeconversiontypeof

Easy? Convert System.Type to UnityEngine.Component

I have a function where I'm returning a System.Type, and need to convert it into a Component.

a) Is this possible, if so how
b) Is it possible to return a Component instead from a function rather than System.Type

I haven't been able to do either.

Example:

 public class aClass {
    public System.Type GetAScript() {
      return typeof(BeamProjectile);  //Where BeamProjectile is a sub class that implements a base class that inherits from MonoBehaviour
   }
 }

 class SomeOtherClass {
     public aClass;
     ...
     public DoSomething() {
       System.Type st = aClass.GetAScript();
       GameObject go;
       go.AddComponent<st>(); /// <-- failure
     }
 }
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avatar image mattssonon · Oct 22, 2013 at 08:22 AM 0
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Doesn't this work?

 public BeamProjectile GetAScript() {
     return new BeamProjectile();
 }

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Answer by Azrapse · Oct 22, 2013 at 09:56 AM

Just use...

 go.AddComponent(st);

... in the last line in your example, as AddComponent is overloaded to accept either a string with the type name, a Type, or a parametric type.

For reference, check second overload here.

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avatar image SinisterRainbow · Oct 24, 2013 at 05:50 AM 0
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Update: I thumbed this up - this is what I ended up doing.

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Answer by dorpeleg · Oct 22, 2013 at 08:25 AM

Try something like:

 public T GetScript<T>()
 {
     return T;
 }
 
 var st = GetScript<BeamProjectile>();
 GameObject go;
 go.AddComponent<st>();

But I don't get why do you need to do that and not just:

 go.AddComponent<BeamProjectile>();
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avatar image SinisterRainbow · Oct 24, 2013 at 05:53 AM 0
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I'm using an abstract class of 'projectiles' in a new weapon system, and I'm storing them all a generic object pool, where they could be of any base type projectile..

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Answer by nicloay · Oct 22, 2013 at 08:30 AM

I faced similar problem, and saw that it's not possible to use System.Type variables in generics. See for example here

You can use reflection to instantiate component, but you can have a problem on mobile devices.

For your case probably will be reasonable to use Strategy Pattern

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