Load without repeating

Hey all, basically I already searched on the forum but I need to fix what I found for my needings...my problem is this. I have a game of 10 levels. At the end of each level a button spawn and clickin on it you go into the next level. I want everytime the player click this button the engine randomly choose trough all the levels not repeating the level already played. I found this but I don't know exactly how to use it...someone can clarify to me?

Code (CSharp):

1.     using UnityEngine;
2.     using System.Collections.Generic;
3.    
4.     public static class SceneManager
5.     {
6.         private const int kNumScenes = 5;
7.         private static List<int> s_SceneList = null;
8.    
9.         public static bool NextScene ()
10.         {
11.             if (s_SceneList == null)
12.             {
13.                 s_SceneList = new List<int> ();
14.                 for (int i = 1; i <= kNumScenes; i++)
15.                 {
16.                     s_SceneList.Add (i);
17.                 }
18.                 for (int i = 0; i < s_SceneList.Count; i++)
19.                 {
20.                     int index = Random.Range (0, s_SceneList.Count);
21.                     s_SceneList.Add (s_SceneList [index]);
22.                     s_SceneList.RemoveAt (index);
23.                 }
24.             }
25.          
26.             if (s_SceneList.Count < 1)
27.             {
28.                 return false;
29.             }
30.          
31.             int scene = s_SceneList [0];
32.             s_SceneList.RemoveAt (0);
33.             Application.LoadLevel (scene);
34.          
35.             return true;
36.         }
37.     }
38.  

plus considering is a old answer maybe there are new methods now to do what I'm looking for...thank you very much for your patience and your time

 

Plus seems I can't add this script to nothing since I have this error message : "can't add script beahviour SceneManager. The script class can't be abstract". :/

 

What are you trying to add that script too? If you want to add it to a GameObject, it needs to be a MonoBehaviour, and not be static.

As far as choosing a random level goes, why not just have a pointer for the current level and use List(T).Remove? https://msdn.microsoft.com/en-us/library/cd666k3e(v=vs.110).aspx

 

thx for answering but must be a better way to do this I think