Shell Navigation and using a Dictionary to pass values.

Question

I am trying to learn how to pass complex data types to a page using a Dictionary. As you can see in the example code below that Name was hardcoded, but I was wondering what is the best practice if I wanted to dynamically set the Name property in the view model (using the value of a XAML control)? Thanks !!!

public class Monkey
{ 
    public string Name { get; set; }
}



Monkey monkey;
monkey = new Monkey { Name = "Mooch" };
  new Dictionary<string, object>
            {
                ["Monkey"] = monkey
            });

Answer 1

Hello,

but I was wondering what is the best practice if I wanted to dynamically set the Name property in the view model (using the value of a XAML control)?

If you get the Monkey object at the runtime in the viewmodel, then you want to update this object at the runtime without create a new Object. you can do this by achieving INotifyPropertyChanged interface for your Monkey.cs.

public class Monkey: INotifyPropertyChanged
{
    private string name;
    public string Name
    {
        set
        {
            if (name != value)
            {
                name = value;
                OnPropertyChanged("Name");
            }
        }
        get
        {
            return name;
        }
    }
    public event PropertyChangedEventHandler PropertyChanged;
    protected virtual void OnPropertyChanged(string propertyName)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
} 

Then you can set the Name directly with monkey.Name="Mooch" and send it

Here is document about Part 5. From Data Bindings to MVVM - Xamarin | Microsoft Learn

Best Regards,

Leon Lu

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