RaisePropertyChanaged in Mvvmcross from one class to another class

Question

public class CartItemViewModel : MvxNotifyPropertyChanged
{
    public double SubTotal
    {
        get { return UnitPrice * Quantity; }
        set
        {
            //RaisePropertyChanged("TotalValue")
        }
    }
 }

 public class CartViewModel : MvxViewModel
 {
     public double TotalValue 
     {
        get
        {
            foreach (var item in cartlist) 
            {
                totalvalue += item.UnitPrice;
            }
            return totalvalue;
        }
        set
        {
            TotalValue = value;
        }
    }
    private double totalvalue;
   }

I want to modify TotalValue property when SubTotal property is changed. Both are in different classes. How to make it possible? It is not working when I pop up Raispropertychanged("TotalValue") in SubTotal. Please Help!

Answer 1

You should handle the PropertyChanged event for all the instances of CartItemViewModel inside the CartViewModel. You receive PropertyChangedEventArgs which has a member called PropertyName. When its value is "SubTotal" then you can call Raispropertychanged(TotalValue). The code is completely added to CartViewModel.