/// <summary>
/// add a new unit conversion item
/// </summary>
/// <param name="precision"> the precision of the display value</param>
/// <param name="ratio"> the radio of inside value to display value about current unit</param>
/// <param name="unitName"> the unit of the display value</param>
/// <param name="key"></param>
private static void AddNewUnit(int precision, double ratio, string unitName, string key)
{
// create a ConversionValue instance
ConversionValue conversionValue = new ConversionValue(precision, ratio, unitName);
// add this item to ourself dictionary
m_unitDictionary.Add(key, conversionValue);
}
/// <summary>
/// add a new unit conversion item
/// </summary>
/// <param name="precision"> the precision of the display value</param>
/// <param name="ratio"> the radio of inside value to display value about current unit</param>
/// <param name="unitName"> the unit of the display value</param>
/// <param name="key"></param>
private static void AddNewUnit(int precision, double ratio, string unitName, string key)
{
// create a ConversionValue instance
ConversionValue conversionValue = new ConversionValue(precision, ratio, unitName);
// add this item to ourself dictionary
m_unitDictionary.Add(key, conversionValue);
}