How to perform an action in Prism's “OnNavigatingTo” for any and all classes

Question

Given I have about 100 classes in my Prism application project, a project can become difficult to debug for other devs. I am looking for a way to show a toast when a user navigates to any page. This toast message will tell the user the respective view model page title of the current view.

public class AViewModel 
{
   public override void OnNavigatingTo(INavigationParameters parameters)
   {
      Toast("AViewModel")
   }
}

public class BViewModel 
{
    public override void OnNavigatingTo(INavigationParameters parameters)
    {
        Toast("BViewModel")
    }
}

public class CViewModel 
{
   public override void OnNavigatingTo(INavigationParameters parameters)
   {
      Toast("CViewModel")
   }
}

public class DViewModel 
{
   public override void OnNavigatingTo(INavigationParameters parameters)
   {
      Toast("DViewModel")
   }
}

Im looking to achieve such functionality without actually including Toast("ViewModelName") in every class. Is there a way I can override something and implement this?

Answer 1

It is easy to achieve in few steps like below

1. Create a BaseViewModel class

    public class BaseViewModel: INavigationAware { string PageName { get; set; } public BaseViewModel(string pageName) { PageName = pageName; } public virtual void OnNavigatedFrom(INavigationParameters parameters) { //Methods gets called when current active page navigated to some other page } public virtual void OnNavigatedTo(INavigationParameters parameters) { //Methods gets called when current page is activated //System.Diagnostics.StackFrame stackFrame = new System.Diagnostics.StackFrame(1); //Toast(stackFrame.GetMethod().DeclaringType.Name); Toast(PageName); } }

2. Inherit BaseViewModel class for each of ur ViewModel class

    public class AViewModel: BaseViewModel { //Constructor public AViewModel(): base(nameof(AViewModel)) { //Some code }

 //MethodA public void MethodA() { //Some code } }

Note:-

base(nameof(AViewModel))

I hope this will help