Sorting an observable collection with linq

linq silverlight observablecollection
zachary picture zachary · Jun 15, 2009 · Viewed 26k times · Source

I have an observable collection and I sort it using linq. Everything is great, but the problem I have is how do I sort the actual observable collection? Instead I just end up with some IEnumerable thing and I end up clearing the collection and adding the stuff back in. This can't be good for performance. Does anyone know of a better way to do this?

Answer

moonlightdock picture moonlightdock · Aug 5, 2009

If you are using Silverlight 3.0, then using CollectionViewSource is the cleanest way. Refer below example: (it can be done via xaml as well)

ObservableCollection<DateTime> ecAll = new ObservableCollection<DateTime>();
CollectionViewSource sortedcvs = new CollectionViewSource();
sortedcvs.SortDescriptions.Add(new System.ComponentModel.SortDescription("Date", 
    System.ComponentModel.ListSortDirection.Ascending));
sortedcvs.Source = ecAll;
ListBoxContainer.DataContext = sortedcvs;

And in corresponding xaml set 

ItemsSource="{Binding}"

for the ListBox or any ItemsControl derived control

Related questions

Could not find an implementation of the query pattern

In my silverlight application I am trying to create a database connection using LINQ. First I add a new LINQ to SQL class, and drag my table called "tblPersoon" into it. Then in my service file I try to execute …

Read More
How do I update a single item in an ObservableCollection class?

How do I update a single item in an ObservableCollection class? I know how to do an Add. And I know how to search the ObservableCollection one item at a time in a "for" loop (using Count as a representation …

Read More
Building Dynamic LINQ Queries based on Combobox Value

I have a combo box in Silverlight. It has a collection of values built out of the properties of one of my LINQ-to-SQL objects (ie Name, Address, Age, etc...). I would like to filter my results based off the value …

Read More