Sorting ObservableCollection

Question

Suppose I have ObservableCollection of employee class

public ObservableCollection<Employee> employeeCollection = new ObservableCollection<Employee>();

public class Employee
{
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public double MobileNumber { get; set; }
    public string City { get; set; }
    public int Age { get; set; }

    public Employee() {}
}

now I am trying to sort the ObservableCollection (“employeeCollection”) by appropriate selection by user from combobox[it will be….Sort By FirstName….Sort By MobileNumber etc…]..

and it is required to get back sorted observable collection…. Means it should not be in form of “var” it should be ObservableCollection<Employee>

So I can assign back it to “ItemsSource” property of “ItemsControl”…

Thanks……

Solution 1

You can sort the view of the collection rather that sorting the collection itself:

// xmlns:scm="clr-namespace:System.ComponentModel;assembly=WindowsBase"
<myView.Resources>
    <CollectionViewSource x:Key="ItemListViewSource" Source="{Binding Itemlist}">
        <CollectionViewSource.SortDescriptions>
            <scm:SortDescription PropertyName="SortingProperty" />
        </CollectionViewSource.SortDescriptions>
    </CollectionViewSource>
</myView.Resources>

And then you can use the CollectionViewSource as ItemSource:

ItemsSource="{Binding Source={StaticResource ItemListViewSource}}"

Solution 2

I think PVitt may have the best solution... however, i did find this SortedObservableCollection class that perhaps could help?

http://softcollections.codeplex.com/

Solution 3

I implemented an ObservableCollectionView which supports sorting and filtering using a lambda (like LINQ but live) and item tracking:

https://mytoolkit.codeplex.com/wikipage?title=ObservableCollectionView

Solution 4

You don't need to sort yourself, but can let WPF do it for you. See SortDescription, for example.

View more solutions

Comments

[Roman Starkov]

An alternative implementation of a sorted observable collection: ObservableSortedList<T>.

[Ondrej Janacek]

Note that PropertyName can't use binding. It directly results in the following run-time error: A 'Binding' cannot be set on the 'PropertyName' property of type 'SortDescription'. A 'Binding' can only be set on a DependencyProperty of a DependencyObject.

[PVitt]

@OndrejJanacek Is this new behaviour? I could swear I used it that way. But I do not have access to the code anymore to check it.

[Ondrej Janacek]

@Well, it's not highly propable that you used it that way. The property is after all called PropertyName which indicates that it could take a string name of a property, not a direct binding to it. But I'm new to WPF, I only stumbled across this because I was searching for the solution and I implemented it, so it's maybe possible that it worked the other way before.

[PVitt]

@OndrejJanacek Anyway... Thanks for the edit.

[sa.he]

Codeplex link is broken

[devjme]

How can I do this descending?

[PVitt]

@devjme docs.microsoft.com/en-us/dotnet/api/…

[devjme]

awesome thx!!!!