// The old way
private static void TypeCastingWithoutPatternMatching(Storage storage)
{
if (storage == null)
{
throw new ArgumentNullException();
}
if (storage is UsbKey)
{
UsbKey usbKey = (UsbKey)storage;
if (usbKey.IsPluggedIn)
{
usbKey.Unload();
Console.WriteLine("USB Drive Unloaded.");
}
else
{
throw new NotImplementedException();
}
}
else if (storage is Dvd)
{
}
else
{
throw new NotImplementedException();
}
}
// Pro účely Dema
// Jinak zde by rozhodně byla lepší abstraktní metoda Eject na Storage
public static void Eject_WithoutPatternMatching(Storage storage)
{
if (storage == null)
{
throw new ArgumentNullException();
}
if (storage is UsbKey)
{
UsbKey usbKey = (UsbKey)storage;
if (usbKey.IsPluggedIn)
{
usbKey.Unload();
Console.WriteLine("USB Drive Unloaded.");
}
}
else if (storage is DVD)
{
DVD dvd = (DVD)storage;
if (dvd.IsInserted)
{
// ...
}
}
}
public void display(UsbKey usb)
{
if (!isLock)
{
stop();
usb.display(screen, source, player);
}
}
static void Main(string[] args)
{
var usb = new UsbKey();
TypeCastingWithoutPatternMatching(usb);
TypeCastingWithPatternMatching(usb);
PatternMathcingInSwitchStatement(usb);
Console.ReadLine();
}
public void SetUsbKey()
{
retry:
UsbKey _usbKeyDrive = new UsbKey();
UsbKeyDriveMessages _messages = new UsbKeyDriveMessages();
UsbKeyDriveErrorEnum _result;
string _key = _usbKeyDrive.CreateKey(out _result);
switch (_result)
{
case UsbKeyDriveErrorEnum.NoUsbKeyDrives:
retry2:
FormUsbKeyDrive _f = new FormUsbKeyDrive();
DialogResult _dr = _f.ShowDialog();
if (_dr == DialogResult.OK)
{
if (_f.CreateUsbKeyDrive)
{
_usbKeyDrive.CreateUSBKeyContainer(out _result);
switch (_result)
{
case UsbKeyDriveErrorEnum.NoUsbDrives:
case UsbKeyDriveErrorEnum.MultipleUsbKeyDrives:
case UsbKeyDriveErrorEnum.ExceptionCreatingKeyDrive:
DialogResult _mb = MessageBox.Show(_mainform, _messages.GetMessage(_result), "USBKey", MessageBoxButtons.OKCancel);
if (_mb == DialogResult.OK)
{
goto retry2;
}
return;
}
}
goto retry;
}
else
{
UsbKeyId = null;
return;
}
case UsbKeyDriveErrorEnum.MultipleUsbKeyDrives:
case UsbKeyDriveErrorEnum.ExceptionWritingKeyFile:
MessageBox.Show(_messages.GetMessage(_result));
UsbKeyId = null;
break;
case UsbKeyDriveErrorEnum.Ok:
UsbKeyId = _key;
break;
}
ShowKey();
}
private void _Timer_Tick(object sender, EventArgs e)
{
UsbKey _usb = new UsbKey();
if (_usb.UsbKeyDrivePresent())
{
CreateUsbKeyDrive = false;
DialogResult = DialogResult.OK;
Close();
}
}
/// <param name="silent">Cancels on error without message</param>
/// <returns></returns>
public byte[] GetUsbKey(string id, bool silent, out bool canceled)
{
retry:
UsbKey _usbKeyDrive = new UsbKey();
UsbKeyDriveMessages _messages = new UsbKeyDriveMessages();
UsbKeyDriveErrorEnum _result;
byte[] _key = _usbKeyDrive.GetKey(id, out _result);
switch (_result)
{
case UsbKeyDriveErrorEnum.Ok:
canceled = false;
return(_key);
case UsbKeyDriveErrorEnum.NoUsbKeyDrives:
case UsbKeyDriveErrorEnum.MultipleUsbKeyDrives:
case UsbKeyDriveErrorEnum.ExceptionReadingKeyFile:
case UsbKeyDriveErrorEnum.CannotFindKeyOnUsbKeyDrive:
case UsbKeyDriveErrorEnum.UsbKeyRequiredToOpen:
if (silent)
{
canceled = true;
return(null);
}
DialogResult _mb = MessageBox.Show(_mainform, _messages.GetMessage(_result), "USBKey", MessageBoxButtons.OKCancel);
if (_mb == DialogResult.OK)
{
goto retry;
}
canceled = true;
return(null);
}
canceled = false;
return(_key);
}
