How do I give an object a script component of a type specified by the calling source?

Question

 public static void Init<T>(GameObject target, bool preserveOriginal, string classTemplateToAssign)
 {

     MonoBehaviour[] mb = target.GetComponents<MonoBehaviour>().ToArray();
     if (mb.Length != 0)
     {
         //PooledObject po = target.AddComponent<POTemplateScript>();
         PooledObject po = target.AddComponent(T as System.Type);
         //BlahBlah all below.

I don't understand how generics work, so that's definitely the first problem, but I think the T after the function name is the same kind of idea as GetComponent<> <-- this part. You're passing T as a parameter. I want the user to be able to pass a script class name, and it just adds a new script instance of that type.

Answer 1

Answer by AnOrdinarySandwich · Dec 24, 2020 at 09:02 AM

Generics are quite useful for sure. You're right about the GetComponent being a generic type, but its not a parameter, it indicates the type to be used. When trying to use a generic type to AddComponent, you're going to need the 'where' constraint, to make sure the given type is actually a MonoBehaviour (you won't need the classTemplateToAssign).

 static public void Init<T>(GameObject target, bool preserveOriginal) where T : MonoBehaviour
 {
     ...
     PooledObject po = target.AddComponent<T>();
 }

https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/where-generic-type-constraint

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How do I give an object a script component of a type specified by the calling source?

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