Unity3D – warning Messages – BCW0028: WARNING: Implicit downcast from ‘UnityEngine.Component’ to ‘UnityEngine.AudioSource’

Unity3D – warning Messages – BCW0028: WARNING: Implicit downcast from ‘UnityEngine.Component’ to ‘UnityEngine.AudioSource’

Implicit Downcast from… to…

BCW0028: WARNING: Implicit downcast from ‘UnityEngine.Component’ to ‘UnityEngine.AudioSource’

This script will generate the BCW0028 error:

...

// buttons[i] -> this is an Array of GameObject

...
// Assegno Audio INIZIO #############################################################################
function AssignAudio () {
  
	var audioSrc : AudioSource;
	
	for(var i : int = 0; i < buttons.Length; i++) // assegno a tutti gli oggetti nell'array l'audio
	    {
	      	// BCW0028: WARNING: Implicit downcast from 'UnityEngine.Component' to 'UnityEngine.AudioSource'.
	      	audioSrc = buttons[i].AddComponent ("AudioSource"); 
	      	

	      	
			buttons[i].audio.clip = buttonAudio0; // Add audio clip
			buttons[i].audio.playOnAwake = false; // not play on awake  
	    }

}// END AssignAudio()
// Assegno Audio FINE ###############################################################################
...

Solution: you should explicity cast the Components to AudioSource yourself using “as” like this:

Change the row:

audioSrc = buttons[i].AddComponent ("AudioSource");

with

audioSrc = buttons[i].AddComponent ("AudioSource") as AudioSource;