Compartilhamento de tecnologia

한어Русский языкEnglishFrançaisIndonesianSanskrit日本語DeutschPortuguêsΕλληνικάespañolItalianoSuomalainenLatina

Propósito

Um comando composto pode acionar vários comandos registrados nele e pode executar vários comandos ao mesmo tempo. Requisitos de negócios, como salvar tudo, podem ser alcançados.

concluir

1. Crie a interface ICompositeCommands e a classe de implementação CompositeCommands

Envolva o objeto CompositeCommand fornecido no Prism na interface ICompositeCommands e na classe de implementação ApplicationCommands

 public interface IApplicationCommands
    {
        CompositeCommand SaveCommand { get; }
    }

    public class ApplicationCommands : IApplicationCommands
    {
        private CompositeCommand _saveCommand = new CompositeCommand();
        public CompositeCommand SaveCommand
        {
            get { return _saveCommand; }
        }
    }
1
2
3
4
5
6
7
8
9
10
11
12
13

2. Registre comandos compostos no IOC
Execute o registro do IOC no código de fundo App.xaml

 protected override void RegisterTypes(IContainerRegistry containerRegistry)
{
   containerRegistry.RegisterSingleton<IApplicationCommands, ApplicationCommands>();
}
1
2
3
4

3. Defina comandos compostos em ViewModel
Defina um comando composto no ViewModel e vincule o comando à camada View
Modelo de exibição:

  private IApplicationCommands _applicationCommands;
        public IApplicationCommands ApplicationCommands
        {
            get { return _applicationCommands; }
            set { SetProperty(ref _applicationCommands, value); }
        }

        public MainWindowViewModel(IApplicationCommands applicationCommands)
        {
            ApplicationCommands = applicationCommands;
        }
1
2
3
4
5
6
7
8
9
10
11

Visualizar:

 <Button Content="Save" Margin="10" Command="{Binding ApplicationCommands.SaveCommand}"/>
1

4. Registre o comando composto com Comandos em vários outros locais.

 public TabViewModel(IApplicationCommands applicationCommands)
  {
    _applicationCommands = applicationCommands;

    UpdateCommand = new DelegateCommand(Update).ObservesCanExecute(() => CanUpdate);

    _applicationCommands.SaveCommand.RegisterCommand(UpdateCommand);
}
 
private void Update()
{
  UpdateText = $"Updated: {DateTime.Now}";
}
1
2
3
4
5
6
7
8
9
10
11
12
13

Desta forma, quando o comando composto ApplicationCommands.SaveCommand for acionado, todos os comandos cadastrados serão acionados.