RunOnce v2

RunOnce.cs

 /// <summary>
    /// A thread safe class that ensures that a given 
    /// <see cref="Action"/> is only executed once.
    /// </summary>
    public class RunOnce
    {
        private Action action;
        private bool hasExecuted;
        
        private readonly object lockObject = new object();

        /// <summary>
        /// Initializes a new instance of the <see cref="RunOnce"/> class.
        /// </summary>
        /// <param name="action">The <see cref="Action"/> delegate to be executed once.</param>
        public RunOnce(Action action)
        {
            this.action = action;
        }

        /// <summary>
        /// Executes the <see cref="Action"/> only if not already executed.
        /// </summary>
        public void Run()
        {
            if (hasExecuted)
            {
                return;
            }
            lock (lockObject)
            {
                if (hasExecuted)
                {
                    return;
                }            
                action();  //Takes 10 sekconds
                hasExecuted = true;                
            }            
        }
    }