LimitedStack.cs

using UnityEngine;
using System.Collections;
using System.Collections.Generic;
using System.Linq;

public class LimitedStack<T>
{

    private LinkedList<T> stack;
    private int maxSize;

    public LimitedStack(int maxSize)
    {
        stack = new LinkedList<T>();
        this.maxSize = maxSize;
    }

    public void Clear()
    {
        stack.Clear();
    }

    public void Push(T entry)
    {
        stack.AddFirst(entry);
        if (stack.Count > maxSize)
        {
            stack.RemoveLast();
        }
    }

    public T[] ToArray()
    {
        return stack.ToArray();
    }

    public int GetCount()
    {
        return stack.Count;
    }
}