CODEWITHSUNDEEP
c#wpf
Alan2
Alan2

Reputation: 24572

How can I send both a string and an int to an ICommand?

I have a ViewModel command that looks like this:

// Category Page
private ICommand openPageCmd;
public ICommand OpenPageCmd =>
    openPageCmd ??
    (openPageCmd = new Command<string>((pageType) => settingsPage.OpenPage(pageType)));

But instead of sending a string I would like to send an ID which is an int and a Name which is a string. Can someone tell me how I can do this?

Upvotes: 0

Views: 53

Answers (1)

Olivier Jacot-Descombes
Olivier Jacot-Descombes

Reputation: 112602

You can create your own command by implementing ICommand. Create a command having a constructor with the required parameters.

See:

public class MyCommand : ICommand
{
    private int _id;
    private string _name;

    public MyCommand(int id, string name)
    {
        _id = id;
        _name = name;
    }

    public bool CanExecute(object parameter) => true;

    public void Execute(object parameter)
    {
        //TODO: Add your implementation
    }

    public event EventHandler CanExecuteChanged;
}

Or better, create your own relay command (generic reusable command):

public class RelayCommand<T> : ICommand
{
    private readonly T _argument;
    private readonly Action<T> _execute;

    public RelayCommand(T argument, Action<T> execute)
    {
        _execute = execute;
        _argument = argument;
    }

    public bool CanExecute(object parameter) => true;

    public void Execute(object parameter)
    {
        _execute(_argument);
    }

    public event EventHandler CanExecuteChanged;
}

The view model

public class MyViewModel
{
    private SettingsPage settingsPage = new ...;

    public int Id { get; set; }
    public string Name { get; set; }

    public MyViewModel()
    {
        OpenPageCmd =
            new RelayCommand<MyViewModel>(this, vm => settingsPage.OpenPage(vm.Id, vm.Name));
    }

    public ICommand OpenPageCmd { get; }
}

This allows the command to use the current values of the view model at any time.

Upvotes: 3

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