THEMA: Bestimmte Werte in einem Text auslesen

public object DoWork()
{
	object o = InValues[0].GetString();

	if (o == null)
		return o;

	string s = (string)o;	

	int v = 0;
    	int pos1 = 0;
    	int pos2 = 0;

	if (s.IndexOf("ab", 0, StringComparison.OrdinalIgnoreCase) >= 0)
      {
      	pos1 = s.IndexOf("ab", 0, StringComparison.OrdinalIgnoreCase);
           	pos2 = s.IndexOf("eur", 0, StringComparison.OrdinalIgnoreCase);
           	pos1 += 3;
           	v = -1;
     	}
     	else if (s.IndexOf("bis", 0, StringComparison.OrdinalIgnoreCase) >= 0)
     	{
      	pos1 = s.IndexOf("bis", 0, StringComparison.OrdinalIgnoreCase);
          	pos2 = s.IndexOf("eur", 0, StringComparison.OrdinalIgnoreCase);
           	pos1 += 4;                
           	v = 1;
     	}
     	else
      	return 0;
          
    	string wert = s.Substring(pos1, pos2 - pos1);
	wert = wert.Replace(".", "");

	return Int32.Parse(wert) + v;
}