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Question by Sommy1491 · Jun 29, 2016 at 04:44 PM · unity5genericstypecasting

How to TypeCast T(Generic Type) into some Class DataType

Hi, I am little bit confuse in type casting through Generic Type. Here in my below code if my mainClassObject of Type T is a type of SignInEventHandler. I want to typecast T in SignInEventHandler type so i can access the SignInEvenHandler Members. Here SignInEventHandler is a Monobehaviour Class.

 public override IEnumerator OnButtonClickEvent (Button buttonType, T mainClassObject){

                     //...............if mainClassObject type is SignInEventHandler...........//

             if (mainClassObject.GetType () == typeof(SignInEventHandler)) {
 
                                // i want to do something like this//
                                SignInEventHandler signIn = (SignInEventHandler)mainClassObject.

             }
             
             yield return new WaitForSeconds (0.0f);
         }



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Answer by jdean300 · Jun 29, 2016 at 05:09 PM

This is because T is too unbounded for the compiler to promise any special behaviour. You can get away with this by using a safe cast:

 SignInEventHandler signIn = mainClassObject as SignInEventHandler
 if (signIn != null) //Will be null if the cast cannot be done
 {
     
 }
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Answer by fafase · Jun 29, 2016 at 05:33 PM

You are misusing generic here. If you need your parameter to implement the type, then the parameter should be of that type. Actually, I would make SignInEventHandler an interface.

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