How to get Items count from CollectionViewSource?

listcollectionview vs collectionviewsource
icollectionview
wpf collectionviewsource

I am using CollectionViewSource to filter the records displayed in a ListBox. The xaml follows.

   <Window x:Class="WPFStarter.ListBoxItemsFilter.ListBoxFilterUsingCollectionViewSource"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        x:Name="userControl"
        Title="ListBoxFilterUsingCollectionViewSource" Height="300" Width="300">
        <Window.Resources>
        <CollectionViewSource Source="{Binding ElementName=userControl, Path=DataContext.Items}"
                              x:Key="cvs" Filter="CollectionViewSource_Filter"/>
        </Window.Resources>
    <StackPanel Orientation="Vertical">
        <TextBox x:Name="txtSearch" TextChanged="txtSearch_TextChanged"/>
        <TextBlock x:Name="txtSummary" Grid.Column="0" HorizontalAlignment="Right" VerticalAlignment="Bottom"  FontSize="8"></TextBlock>
        <ListBox ItemsSource="{Binding Source={StaticResource cvs}}" DisplayMemberPath="First"/>
    </StackPanel>

</Window>

And here is my code-behing ( please don;t mind this code-behind, in the real application i am using the best of MVVM for this scenario).

 public partial class ListBoxFilterUsingCollectionViewSource : Window
    {
        private string _text="";
        private readonly CollectionViewSource _viewSource;

        public ListBoxFilterUsingCollectionViewSource()
        {
            InitializeComponent();
            _viewSource = this.FindResource("cvs") as CollectionViewSource;
        }

        private void CollectionViewSource_Filter(object sender, FilterEventArgs e)
        {
            var character = e.Item as Character;
            e.Accepted = character != null && character.First.ToLower().Contains(_text.ToLower());
        }

        private void txtSearch_TextChanged(object sender, TextChangedEventArgs e)
        {
            _text = txtSearch.Text;
            _viewSource.View.Refresh();

            SetSummary();
        }

        private void SetSummary()
        {                
            var initialCount = 10; //HELP????
            var filteredCount = 10; //HELP????
            txtSummary.Text = String.Format("{0} of {1}", filteredCount, initialCount);
        }
    }

QUESTION: I Need help in writing the "SetSummary" method, wherein i can get the "initialCount" and the "filteredCount" from CollectionViewSource object.

Thanks for your interest.

The source collection and collectionview both implements IEnumerable so you can always iterate over them and count how many are in them. But I would only recommend doing this if you have no access to the actual collection you used as source.

private void SetSummary() 
{
    int initialCount = 0;
    foreach(var item in _viewSource.View.SourceCollection)
    {
        initialCount++;
    }

    int filteredCount = 0;
    foreach (var item in _viewSource.View)
    {
        filteredCount++;
    }
}

CollectionView.Count Property (System.Windows.Data), CollectionView.Count public virtual int Count { get; } member this.Count : Remarks. If a filter is set, this property value only includes items that pass the filter​. In my WPF application I have a CollectionViewSource which is providing a view to a private ObservableCollection. The CollectionViewSource has a PropertyGroupDescription which is utilised in a ListBox to present data to the User's preference. Using a ControlTemplate containing a Expander Control within the ListBox GroupStyle, the result is quite

You could also do _viewSource.View.Cast<object>().Count() for the filtered list and _viewSource.View.SourceCollection.Cast<object>().Count() for the original.

ListCollectionView Class (System.Windows.Data), CollectionView, System. All collections have a default CollectionView. you can use to compare items in the view. (Inherited from CollectionView). Count Gets or sets a custom object that implements IComparer to sort items in the view. Now I have placed a label in the view and I would like this label to show the number of items currently displayed in the listview. How can I do it? I have found things like this but I don't understand at all what is RowViewModelsCollectionView. In this link it is suggested to bind as below:

I think the better solution is, as usual, Linq!

_viewSource.View.Cast<[your_type]>().Count();

...or...

_viewSource.View.Cast<object>().Count();

...if you don't know the items' type at runtime!

Count of filtered items in UI for Silverlight GridView, to have your questions answered on Count of filtered items of UI for is not applicable if you are using CollectionView as items source. I would therefore expect testCount1 to be 6, and testCount2 to be 3. However, both are 6. If I manually iterate through the CollectionView and count the items, I do get 3, but Count returns 6 always. I've tried calling Refresh on the CollectionView, just to see if that would correct the result, but there was no change. Is the documentation wrong?

If you're doing MVVM, you could have your VM create a collection view rather than one being created on your behalf by the CollectionViewSource. Then, you have control over what type of CVS is created, so you can create a ListCollectionViewSource, which has a Count property. It really depends on the properties of the data you're filtering.

Working with ICollectionViewSource in WPF, You can add them in the collectionView to get the desired output. The Predicate takes in the item and based on the value true or false it returns, it selects Count(lamda) > 0) { SortDescription currentSortDescription = this. Any controls that you bind to the same CollectionViewSource will always have the same current item. You can access the current item programmatically through the ICollectionView.CurrentItem property of the CollectionViewSource.View property value. If the items in the collection are collections themselves,

var count = DataGrid.ItemsSource.OfType<object>().Count();

ICollectionView explained, Lately I have been getting a lot of questions on ICollectionView so I using filtering on the list always count the items in the CollectionView and  In order to get the filtered items from the list (e.g. to write to a file), is there a clean way of doing it. My current solution is. var filteredItems = originalCollection.Where(i => view.Filter(i)); In the code I do check for nulls on originalCollection and view.Filter.

A generic version of ICollectionView used in a MVVM searchable list , To this aim we will use a WPF ListView to display the searched items and a TextBox to as long as ICollectionView does not have a built-in generic version. Count:2' with name 'BaseShapeItems' has received sequence of  I found that it is handy to have a CollectionViewSource in my ViewModel and bind the ListBox (in my case) to the CollectionViewSource.View while setting the CollectionViewSource.Source to be the list I want to use.

Wiring CollectionView and updating itself without the need for , private bool PartsFilter(object item) { var editPartViewModel = item as int CollectionCount { get { return AllPartsCollectionView.Count; } }. Just you need to pass the Enumerable to CollectionViewSource.GetDefaultView. Thus rather than defining this.ListboxControl.ItemsSource = this.Source; you need to write : this.ListboxControl.ItemsSource = CollectionViewSource.GetDefaultView(this.Source); The List will get the CollectionView it requires.

CollectionView Class, import { CollectionView, SortDescription} from '@grapecity/wijmo'; // create a CollectionView based on sortDescriptions.push(sortDesc); // show only items with amounts greater than 100 view.filter Index of the item that will become current. CollectionViewSource is a proxy for a CollectionView class, or a class derived from CollectionView. CollectionViewSource enables XAML code to set the commonly used CollectionView properties, passing these settings to the underlying view. CollectionViewSource has a View property that holds the actual view and a Source property that holds the

Comments
  • Just a note that the filteredCount is the number if visbile items not a count of the items that have been filtered out.
  • Thank you for clarifying how to get at the filtered/sorted contents of a CollectionViewSource. I was unable to get the first item in the CollectionViewSource until your comment: var firstItem = this.xViewInDescendingOrder.View.Cast<Thing>().ElementAt<Thing>(0);
  • Sorry i could not get it. Can you please explain with some code by taking my code in the context. Thanks.
  • Through this you can get counted number of itemsSource e.g 2 , 3
  • While this code may answer the question, it is better to explain how to solve the problem and provide the code as an example or reference. Code-only answers can be confusing and lack context.
  • While this code may answer the question, it is better to explain how to solve the problem and provide the code as an example or reference. Code-only answers can be confusing and lack context.