public FormResistorHelper()
        {
            InitializeComponent();

            if (File.Exists("autosave.txt"))
            {
                listBoxResistors.Items.AddRange(File.ReadLines("autosave.txt").Select(Resistor.FromTsv).ToArray());
                Resistor.ResetSearchCache();
            }
        }
 /// <summary>
 /// speichert automatisch alle Widerstände
 /// </summary>
 /// <param name="resistors">Widerstände, welche gespeichert werden sollen</param>
 static void AutoSave(Resistor[] resistors)
 {
     File.WriteAllLines("autosave.txt", resistors.Select(x => x.ToTsv()));
     Resistor.ResetSearchCache();
 }