Dart - 按類名調用類構造函數

Question

我有以下代碼： -

  switch (code) {
    case "BleDisconnectedException":
      throw BleDisconnectedException(msg, details);
    case "BleGattException":
      throw BleGattException(msg, details);
    case "BleGattCallbackTimeoutException":
      throw BleGattCallbackTimeoutException(msg, details);
    case "BleCharacteristicNotFoundException":
      throw BleCharacteristicNotFoundException(msg, details);
    case "BleGattCannotStartException":
      throw BleGattCannotStartException(msg, details);
    default:
      throw e;
  }

如何使dart自動執行switch-case，即按名稱調用類構造函數，以String提供？

Answer 1

正如我所知，目前的Dart是不可能的，但你可以這樣做：

var factories = Map<String, Object Function()>{'Foo', () => new Foo(), 'Bar', () => new Bar()};

Object instance = factories['Foo']();