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Question by wesleywh · Feb 03, 2017 at 02:57 AM · runtimedynamictypecasting

Dynamic Type Casting

I could use some help on this one. Is it possible to dynamically type cast something? Here is what I am doing:

 GameObject holder;
 holder = (string.IsNullOrEmpty(action.tagOfHolder) == false) ? GameObject.FindGameObjectWithTag (action.tagOfHolder) : GameObject.Find(action.nameOfHolder);
 
 if (holder.GetComponent (action.playerComponentScript) != null) {
     Type mytype = Type.GetType (holder.GetComponent (action.playerComponentScript));
     mytype script = holder.GetComponent (action.playerComponentScript);

I keep getting this error:

The type or namespace name `mytype' could not be found. Are you missing a using directive or an assembly reference?

I don't know the types of the component since this is decided based on what I am trying to find. I want to dynamically type cast this so I can enable/disable the component. I can't just do:

 holder.GetComponent (action.playerComponentScript).enabled = true;

because it needs to know what type it is(Example):

 holder.GetComponent ("Animation" as Animation).enabled = true;

Anyone have any direction for me?

NOTE: Other variations I have tried...

 (holder.GetComponent (action.playerComponentScript) as myType).enabled = true;
 
 (mytype)holder.GetComponent (action.playerComponentScript).enabled = true;

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avatar image hexagonius · Feb 03, 2017 at 09:05 AM 0
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it's more a question of who has the enabled ability. that's $$anonymous$$onoBehaviour. use that ins$$anonymous$$d.

avatar image wesleywh · Feb 03, 2017 at 11:37 PM 1
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@hexagonius Unfortunately, that was one I have tried previously and it didn't do the trick for me :(.

Oh my goodness! @PizzaPie you are a life saver. I took what you said and did the following:

 GameObject holder;
 holder = (string.IsNullOrEmpty(action.tagOfHolder) == false) ? GameObject.FindGameObjectWithTag (action.tagOfHolder) : GameObject.Find(action.nameOfHolder);
 
 if (holder.GetComponent (action.playerComponentScript) != null) {
     Type mytype = holder.GetComponent (action.playerComponentScript).GetType ();
     if (mytype.GetProperty("enabled") != null)
     {
         System.Reflection.PropertyInfo rpi = mytype.GetProperty("enabled");
         rpi.SetValue(holder.GetComponent (action.playerComponentScript), action.scriptEnabled, null);
     }
 ....

That worked like a charm! You need to put your comment as an answer so I can mark it as correct. This is amazing, thank you.

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Best Answer

Answer by PizzaPie · Feb 03, 2017 at 04:25 PM

does it work till Line 5? if so use that

 public static void SetEnabledTo(System.Object targetObj,bool isEnable)
 {
         if (targetObj == null)
             return;
         
         Type aType = targetObj.GetType();
         if (aType.GetProperty("enabled") != null)
         {
             System.Reflection.PropertyInfo rpi = aType.GetProperty("enabled");
             rpi.SetValue(targetObj, isEnable, null);
         }
 }

Note:According to c# docs ProperyInfo.SetValue has an overload Set(Object,Object) but for some reason it won't show it on VS

or change the mytype on line 6 to var but you ll still won't know if enabled propery exist

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