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Question by Proxtx · Apr 14, 2020 at 02:46 PM · c#eventeventsystemargumentexception

passing function to class

 public class option
 {
     public UnityEvent onclick = new UnityEvent();
 
     public string name;
 }

With this code I'm able to pass a funtion to the class but only functions from the same class:

 public class objScript : MonoBehaviour
 {
     public List<option> defaultOptions = new List<option>();
 
     void yey()
     {
         Debug.Log("YAY");
     }
     void Start()
     {
 
         opti = new option();
         opti.name = "Delete";
         opti.onclick.AddListener(yey);
         defaultOptions.Add(opti);
 }}

This won't work:

 public class objScript : MonoBehaviour
 {
 
     public List<option> defaultOptions = new List<option>();
 
     void Start()
     {
         options opt = GetComponent<options>();
 
         option opti;
 
         opti = new option();
         opti.name = "Delete";
         opti.onclick.AddListener(opt.delete); //options.delete is defined
         defaultOptions.Add(opti);
 }}

ERORR: ArgumentException: Value does not fall within the expected range.

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Answer by Jasr_88 · Apr 14, 2020 at 05:47 PM

To access a method from another class you need to specify that the method is for Public Access

  public class Option
  {
      public UnityEvent onclick = new UnityEvent();
  
      public string name;
      public void Delete(){
           // Some sentences to delete....
      }
 
  }

Now this code will work

  public class ObjScript : MonoBehaviour
  {
  
      public List<Option> defaultOptions = new List<Option>();
  
      void Start()
      {
          options opt = GetComponent<Options>();
  
          option opti;
  
          opti = new Option();
          opti.name = "Delete";
          opti.onclick.AddListener(opt.Delete); //options.delete is defined an NOW have public access
          defaultOptions.Add(opti);
      }
 }

For more information about access modifiers you might what to read the official documentation https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/classes-and-structs/access-modifiers

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