Wpf mvvm ObservableCollection doesn't update listView

Question

I want to update a listview in View when adding/removing an entry in viewmodel.

 

When running to curser I can see, that my Categories_GetActive is updated with row 4(5,6,7 and so on) but it doesn't show up in my ListView.

 

So I miss something (I think) in binding the ListView to the ObservableCollection in the ViewModel. But cann't see what.

 

When starting the page, the 3 rows from db is in the listview so I know I have the correct binding

 

Can anyone please help me to see, what I'm doing wrong?

 

The UpdateSourceTrigger=PropertyChanged in the View I added to see, if that would help to update but no.

 

If You want the full code, just say so. There is nothing to hide in my code :-)

 

Best regards

Simsen :-)

My Listview

<ListView x:Name="LivCategories" ItemsSource="{Binding Categories_GetActive, UpdateSourceTrigger=PropertyChanged}"
                              SelectedItem="{Binding SelectedCategory}" Grid.Row="0" Grid.Column="0">
     <ListView.View>
         <GridView>
             <GridViewColumn Header="Id" Width="50" DisplayMemberBinding="{Binding CategoryId}"/>
             <GridViewColumn Header="Navn" Width="250"  DisplayMemberBinding="{Binding CategoryName}"/>
             <GridViewColumn Header="Global" Width="50"  DisplayMemberBinding="{Binding CategoryIsGlobal}"/>
             <GridViewColumn Header="Project" Width="150"  DisplayMemberBinding="{Binding ProjectName}"/>
             <GridViewColumn Header="ProjectId" Width="0"  DisplayMemberBinding="{Binding ProjectId}" />
          </GridView>
      </ListView.View>
</ListView>

My ViewModel

public CategoryViewModel()
{
    LoadCategories();
    LoadProjects();
    CmdSave = new MyICommand(SaveChanges);
    CmdSaveNew = new MyICommand(SaveNew);
}
private ObservableCollection<Category> _categories_GetAll;
public ObservableCollection<Category> Categories_GetAll
{
    get
    {
        return _categories_GetAll;
    }
    set
    {
        _categories_GetAll = value;
        OnPropertyChanged("Categories_GetAll");
    }
}

//Active
private ObservableCollection<Category> _categories_GetActive;
public ObservableCollection<Category> Categories_GetActive
{
    get
    {
        return _categories_GetActive;
    }
    set
    {
        _categories_GetActive = value;
        OnPropertyChanged("Categories_GetActive");
    }
}

//Inactive
private ObservableCollection<Category> _categories_GetInactive;
public ObservableCollection<Category> Categories_GetInactive
{
    get
    {
        return _categories_GetInactive;
    }
    set
    {
        _categories_GetInactive = value;
        OnPropertyChanged("Categories_GetInactive");
    }
}

//Load Categories
public void LoadCategories()
{
    DalCategory dalCategory = new DalCategory();
    var categories = dalCategory.GetCategories();

    if (categories != null)
    {
        //All
        List<Category> Categories_GetAllList = categories;
        Categories_GetAll = new ObservableCollection<Category>(Categories_GetAllList);

        //Active
        List<Category> Categories_GetActiveList = categories.Where(x => x.CategoryIsObsolete == false).ToList();
        Categories_GetActive = new ObservableCollection<Category>(Categories_GetActiveList);

        //Inactive
        List<Category> Categories_GetInactiveList = categories.Where(x => x.CategoryIsObsolete == true).ToList();
        Categories_GetInactive = new ObservableCollection<Category>(Categories_GetInactiveList);
    }
}

In this method I add a row to the Categories_GetCative

public void SaveNew()
{
    ResetMessages();

    DalCategory dal = new DalCategory();

    if (!string.IsNullOrEmpty(CategoryName))
    {
        string name = CategoryName;
        bool global = CategoryIsGlobal;
        bool obsolete = CategoryIsObsolete;
        int projectId = ProjectId;

        Category cat = new Category();
        cat.CategoryName = CategoryName;
        cat.CategoryIsGlobal = CategoryIsGlobal;
        cat.CategoryIsObsolete = CategoryIsObsolete;
        cat.ProjectId = ProjectId;

        int categoryId = dal.NewCategory(cat);

        if (cat.CategoryIsObsolete == false)
        {
            Categories_GetAll.Add(cat);
            Categories_GetActive.Add(cat);
        }
        else
        {
            Categories_GetInactive.Add(cat);
        }

        MessageOk = "Kategorien er gemt";
    }
    else
    {
        MessageError = "Kategorinavn skal udfyldes";
    }
}

Here I make my PropertyChanged

public event PropertyChangedEventHandler PropertyChanged;
public void OnPropertyChanged(string propertyName)
{
    PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}