我的ListBox ItemSource如何在WPF和C＃中实现可观察的集合

Question

I have a ListBox (EmpView) which is populated by a select statement via LINQ to SQL from a typed dataset. I have to put a button to be able to refresh the list box with updated data.

How do I make my dataset (if possible) or get my ListBox ItemSource to implement an observable collection?

Here is my code

public partial class ListOfEmployees : UserControl
{
    MyDataContext db = new MyDataContext();

    var employees = from emp in db.EmployeeMasters
    orderby emp.Surname
    select emp;         

    EmpView.ItemsSource = employees;
}

Answer 1

All you should need to do then is create a new ObservableCollection with the selected items added via the constrctor or Add . eg

var observableCollection = new ObservableCollection<Employee>(employees);
EmpView.ItemsSource = observableCollection;

The type of your item class may of course be different. To easily change the collection you might want to store a reference to it somewhere.

As noted in the comments this will only take note of changes caused by explicit operations on the collection.