你不需要转换器。只需将ICommand绑定到Button.Command属性。然后在视图模型类中引入一个IsConnected属性来标记当前的连接状态，并在命令CanExecute delegate中检查它：

ViewModel.cs

class ViewModel : INotifyPropertyChanged
{
  // Bind to the connect button
  public ICommand ConnectCommand => new RelayCommand(ExecuteConnectCommand, CanExecuteConnectCommand);

  // Reflect the current connection state
  private bool IsConnected { get; set; }

  // Will disable the button when IsConnected returns true
  private bool CanExecuteConnectCommand(object commandParameter)
  {
    !this.IsConnected;
  }

  private void ExecuteConnectCommand(object commandParameter)
  {
    this.IsConnected = true;

    // TODO::Create connection    
  }
}

请参阅Microsoft文档：RelayCommand实现的中继命令逻辑。