Ggtcf

In Prism Mvvm, Prism.Unity library, when I replace DelegateCommand with Binding Mvvm Command. It is not working. This is my working code

public class MainPageViewModel : BindableBase

 private DelegateCommand _navigationCommand;

 private INavigationService _navigationService;
 public DelegateCommand NavigateCommand => _navigationCommand ?? (_navigationCommand = new DelegateCommand(ExecuteCommand));

 public MainPageViewModel(INavigationService navigationService)
 
 _navigationService = navigationService;
 
 void ExecuteCommand()
 
 _navigationService.NavigateAsync("SecondPage");
 

Now I make changes in DeletegateCommand, Command not getting fire. This is my modified code

public class MainPageViewModel : BindableBase

 public ICommand _navigationCommand private set; get; 
 private INavigationService _navigationService;

 public MainPageViewModel(INavigationService navigationService)
 
 _navigationService = navigationService;
 _navigationCommand = new Command(() => ExecuteCommand());
 
 void ExecuteCommand()
 
 _navigationService.NavigateAsync("SecondPage");
 

Well I am not completely sure that this could be the reason but I think your code should look something like this:

public ICommand NavigationCommand set; get; 

Then set it in the constructor:

 public MainPageViewModel(INavigationService navigationService)
 
 _navigationService = navigationService;
 NavigationCommand = new Command(ExecuteCommand);
 

And your method would look something like below:

private void ExecuteCommand(object obj) 

 _navigationService.NavigateAsync("SecondPage");

use object obj if you want to pass any data as Command Parameter

I implement command wrong in XAML due to that I was facing this issue.

Thank you.