Nsryjdtyk

I am new to WPF, and I am struggling on adding functionality on observable collections.

I have dropbox, datagrid and a list box listbox.

Data grid and list boxes are binded to corresponding observable collections.

What I want to do is, every time selection of dropbox or items in listbox(not the selection of item but the available items) change I want to call a function to populate my datagrid.

*Listbox is populated by user.

Here is my code

XAML

     <controls:SearchableDropBox DomainObject="{Binding ClassA}"                            

InputValidationManifest="{Binding ClassValidation, Mode=OneWay}"/>





         <Custom:XamDataGrid DataSource="{Binding Path=ClassB.ClassList}"                        

GroupByAreaLocation="None" />



     <controls:ListBox x:Name="listBoxInputs" ItemsSource="{Binding ClassC, Mode=oneWay}">

VIEMMODEL

 class MainViewModel : ViewModel

    {

        #region Attributes



        private classA _classa;

        private ObservableCollection<classC> _classC;

        private classB;



        #endregion



        public MainViewModel()

        {



            this._classc= new ObservableCollection<classC>();

           this._classB = new classB()





        }



public classA ClassA

        {

            get { return _classA; }

            set

            {

                if (!Equals(value, _classA))

                {



                    _classA= value;

                    SelectionChanged(); //This is the function I want add on //propertychanged event

                    OnPropertyChanged(nameof(classA));

                }



            }

        }



        public ObservableCollection<classC> ClassC

    {

        get { return classC; }

        set

        {

            this.classC= value;

            OnPropertyChanged(nameof(ClassC));

        }

    }

ClassB

 public class classB

    {

        private ObservableCollection<String> _classList;



    }

I want to call SelectionChanged() function when the selection of the dropbox, and when item added/deleted in list box without overriding their current notfypropertychanged events.

For add/Remove in _classC collection, you subscribe to CollectionChanged event.

     public MainViewModel()

    {

        this._classc= new ObservableCollection<classC>();

        this._classB = new classB()

       _classC.CollectionChanged += _classC_CollectionChanged;

    }



     private void _classC_CollectionChanged(object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e)

    {

        //Populate ClassB.ClassList / Datagrid Function Call

    }