How do I implement this TextChanged event handler the MVVM way?

Question

How do I implement this event handler the MVVM way?

Other solutions I've seen have you implement a command or a property on the view model. However, this means every text changed event turns into a command execution or property set. But this event handler filters out everything except user input. How would you do that with a command or property binding?

private async void SearchBox_TextChanged(AutoSuggestBox sender, AutoSuggestBoxTextChangedEventArgs args)
{
   if (args.Reason == AutoSuggestionBoxTextChangeReason.UserInput)
   {
      await this.ViewModel.RefreshAddressSuggestions(sender.Text);    
   }
}

Answer 1

How do I implement this TextChanged event handler the MVVM way?

For your requirement, you could bind Text property with ViewModel, and check the Text value change to invoke RefreshAddressSuggestions method.

<AutoSuggestBox Text="{x:Bind SearchText, Mode=TwoWay}"> 


private string searchText;

public event PropertyChangedEventHandler PropertyChanged;
private void OnPropertyChanged([CallerMemberName] string propertyName = null)
{
    if (PropertyChanged != null)
    {
        this.PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
    }
}
public string SearchText
{

    get { return searchText; }
    set
    {
        _passWord = value;
        this.ViewModel.RefreshAddressSuggestions(value);
        OnPropertyChanged();


    }
}