CODEWITHSUNDEEP
c#wpfobservablecollection
Siegfried.V
Siegfried.V

Reputation: 1595

Update an ObservableCollection that is the result of another ObservableCollection

Excuse me but I didn't know how to formulate the question :

I have two ObservableCollection

ObservableCollection MyMainList is the ObservableCollection where are stored all of my objects.

ObservableCollection<T> MyFilteredList = new ObservableCollection(MyMainList.Where(x=>Condition))

is the ObservableCollection filtered according some parameters.

At one moment, I need to add or remove objects from MyMainList, but then MyFilteredList is not updated automatically.

I need always to do :

MyMainList.Add(newObject);
MyFilteredList.Add(newObject);

Is there a way to do all of that in just one line, so when I modify MyMainList, MyFilteredList will be automatically updated?

Edit : To answer to Adriano Repetti, when I open my window, I load all of objects (so I don't need to reload my DB everytime I change filters). I have three different filters : - 1 combobox "Affaire" (list of the contracts) - 1 combobox "Phase" (list of the subcontracts) - 1 TextBox "Filter" ( if I want to see only objects whose name contains that text).

When I change selection of 1st ComboBox, I update the list of subcontracts, and update the filtered list of assemblies.

private Affaire selectedAffaire;
public Affaire SelectedAffaire
{
   get { return selectedAffaire; }
   set
   {
      selectedAffaire = value;
      this.NotifyPropertyChanged("SelectedAffaire");
      if (value != null)
      {
         GetListPhaseInContract(); //I update the list of subcontracts in 2nd Combobox
      }
      UpdateListAssemblages(); // I update MyFilteredList
   }
}

When I change selection of 2nd ComboBox (subcontract), I update the list of MyFilteredList

private Phase selectedPhase;
public Phase SelectedPhase
{
   get { return selectedPhase; }
   set
   {
       selectedPhase = value;
       this.NotifyPropertyChanged("SelectedPhase");
       UpdateListAssemblages();
   }
}

Then when I change my TextBox value, I also update the list

private string texteFiltre;
public string TexteFiltre
{
   get { return texteFiltre; }
   set
   {
      texteFiltre = value;
      this.NotifyPropertyChanged("TexteFiltre");
      UpdateListAssemblages();
   }
}

If I understood, this post is what I need to look for? I don't know yet what are ICollectionView, but I guess I need to look in that way?Will I gain some execution time using ICollectionView? as I see I need anyway to Refresh it?

Upvotes: 0

Views: 669

Answers (1)

Alex.Wei
Alex.Wei

Reputation: 1883

Since you didn't give us the detial of the data struct, I just assume that PhaseInContract is included in MainList. So, just simply create two views for your MainList, then binding them to UI. All views will synchronize with source automatically.

Public ICollectionView MainListView;
Public ICollectionView PhaseInContractView;
Public ObservableCollection<YourDataClass> MainList;

public YourViewModel()
{
    MainList = new ObservableCollection<YourDataClass>();

    // Load datas form db and fill MainList

    MainListView = new CollectionViewSource() { Source = MainList }.View;
    MainListView.Filter = (x) =>
    {
        // your MainListView filtering logic.
    };

    PhaseInContractView = new CollectionViewSource() { Source = MainList }.View;
    PhaseInContractView.Filter = (x) =>
    {
        // your PhaseInContractView filtering logic
    };

private Affaire selectedAffaire;
public Affaire SelectedAffaire
{
    get { return selectedAffaire; }
    set
    {
        selectedAffaire = value;
        this.NotifyPropertyChanged("SelectedAffaire");
        if (value != null)
        {
           PhaseInContractView.Refresh();
        }
        MainListView.Refresh();
    }
}

// And other properties.
...

Upvotes: 1

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