c# Serial Port Search [Port name, Friendly Name] 시리얼포트 검색

static void Main(string[] args)
{
    Dictionary<string, string> friendlyPorts = BuildPortNameHash(SerialPort.GetPortNames());
    foreach (KeyValuePair<string, string> kvp in friendlyPorts)
    {
        Console.WriteLine("Port '{0}' is better known as '{1}'", kvp.Key, kvp.Value);
    }
}
/// <summary>
/// Begins recursive registry enumeration
/// </summary>
/// <param name="portsToMap">array of port names (i.e. COM1, COM2, etc)</param>
/// <returns>a hashtable mapping Friendly names to non-friendly port values</returns>
static Dictionary<string, string> BuildPortNameHash(string[] portsToMap)
{
    Dictionary<string, string> oReturnTable = new Dictionary<string, string>();
    MineRegistryForPortName("SYSTEM\\CurrentControlSet\\Enum", oReturnTable, portsToMap);
    return oReturnTable;
}
/// <summary>
/// Recursively enumerates registry subkeys starting with startKeyPath looking for 
/// "Device Parameters" subkey. If key is present, friendly port name is extracted.
/// </summary>
/// <param name="startKeyPath">the start key from which to begin the enumeration</param>
/// <param name="targetMap">dictionary that will get populated with 
/// nonfriendly-to-friendly port names</param>
/// <param name="portsToMap">array of port names (i.e. COM1, COM2, etc)</param>
static void MineRegistryForPortName(string startKeyPath, Dictionary<string, string> targetMap, 
    string[] portsToMap)
{
    if (targetMap.Count >= portsToMap.Length)
        return;
    using (RegistryKey currentKey = Registry.LocalMachine)
    {
        try
        {
            using (RegistryKey currentSubKey = currentKey.OpenSubKey(startKeyPath))
            {
                string[] currentSubkeys = currentSubKey.GetSubKeyNames();
                if (currentSubkeys.Contains("Device Parameters") && 
                    startKeyPath != "SYSTEM\\CurrentControlSet\\Enum")
                {
                    object portName = Registry.GetValue("HKEY_LOCAL_MACHINE\\" +
                        startKeyPath + "\\Device Parameters", "PortName", null);
                    if (portName == null ||
                        portsToMap.Contains(portName.ToString()) == false)
                        return;
                    object friendlyPortName = Registry.GetValue("HKEY_LOCAL_MACHINE\\" +
                        startKeyPath, "FriendlyName", null);
                    string friendlyName = "N/A";
                    if (friendlyPortName != null)
                        friendlyName = friendlyPortName.ToString();
                    if (friendlyName.Contains(portName.ToString()) == false)
                        friendlyName = string.Format("{0} ({1})", friendlyName, portName);
                    targetMap[portName.ToString()] = friendlyName;
                }
                else
                {
                    foreach (string strSubKey in currentSubkeys)
                        MineRegistryForPortName(startKeyPath + "\\" + strSubKey, targetMap, portsToMap);
                }
            }
        }
        catch (Exception)
        {
            Console.WriteLine("Error accessing key '{0}'.. Skipping..", startKeyPath);
        }
    }
}