//构造函数
public LoginViewModel()
{
IsEnable = true;
UserInfo = new UserInfo();
BtnLoginCmd = new RelayCommand(new Action<object>(Login));
BtnSignCmd = new RelayCommand(new Action<object>(Sign));
}
//构造函数
public SignVM()
{
IsEnable = true;
UserInfo = new UserInfo();
BtnSignCmd = new RelayCommand(new Action<object>(Sign));
}