wpf datagrid not updating after change to observable collection

Question

Hi All,

My Delete and add methods work fine, the Update is calling the HTTPPut and changing the data but i cant get the WPF form to update the same way i have been updating with add and delete.

My class is implementing INotifyPropertyChanged and i have the OnPropertyChanged method.

is there a better way to update the observable collection for add and delete that will fix update?
Thanks
Madaxe

//----------------------------------------------------------

protected void OnPropertyChanged([CallerMemberName] string propertyName = "")
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }

//----------------------------------------------------------

        public void UpdateContinent(string iNewContinentName, int iContinentObjectId)
        {
            Task<ContinentModel> TaskContinentModel = this.UpdateExistingContinent(iNewContinentName, iContinentObjectId);
            ObservableCollection<ContinentModel> NewContinentModels = _ContinentModels;
            ContinentModel UpdatedContinentModel = TaskContinentModel.Result;

            NewContinentModels.Where(w => w.objectID == UpdatedContinentModel.objectID).ToList().ForEach(i => i.continentName = iNewContinentName);

            this.ContinentModels = NewContinentModels;
        }

        private async Task<ContinentModel> UpdateExistingContinent(string iNewContinentName, int iContinentObjectId)
        {
            ContinentModel ReturnContinentModel = null;

//----------------------------------------------------------

        public void CreateContinent(string iContinentName)
        {
            Task<ContinentModel> TaskContinentModel = this.CreateNewContinent(iContinentName);
            ObservableCollection<ContinentModel> NewContinentModels = _ContinentModels;
            NewContinentModels.Add(TaskContinentModel.Result);
            this.ContinentModels = NewContinentModels;
        }


        private async Task<ContinentModel> CreateNewContinent(string iContinentName)
        {
            ContinentModel ReturnContinentModel = null;

//----------------------------------------------------------

Answer 1

CollectionViewSource.GetDefaultView(DGD_UserList.ItemsSource).Refresh();

this works once i added this

Answer 2

Hi, change your update method (assign !)

public void UpdateContinent(string iNewContinentName, int iContinentObjectId)
{
Task<ContinentModel> TaskContinentModel = this.UpdateExistingContinent(iNewContinentName, iContinentObjectId);
ObservableCollection < ContinentModel> NewContinentModels = _ContinentModels;
ContinentModel UpdatedContinentModel = TaskContinentModel.Result;

this.ContinentModels = NewContinentModels.Where(w => w.objectID == UpdatedContinentModel.objectID).ToList().ForEach(i => i.continentName = iNewContinentName);
}