How to assign context and refresh it in Entity Framework?

Question

I created a new entity object and bound it to controls in another window (edit window). After modifying and saving I assigned a new entity object into the one in the main window. The old entity object is bound into a datagrid, now I want the datagrid to display the data that I had modified and saved.

ObjectContext.Refresh Method (RefreshMode, Object) seems to be what I want but I don't know how to use it correctly.

In short :
I have a main window with datagrid displaying the whole data of the table. Users can pick one row and edit it in a edit window. After saving, the datagrid should display what has been modified.

Answer 1

Your best bet here is to use an ObservableCollection as your data source for the datagrid instead of the query.

And look at implementing INotifyPropertyChanged interface in your Customer class.

The ObservableCollection is initially populated by the database query. User changes are made to elements within the ObservableCollection and once complete you then just need to trigger transferring the changes to wherever you originally obtained your list of Customer objects

By doing this changes made both to the collection of Customers and to individual Customer objects (if present within the datagrid) will be automatically updated for you.

edit

I must admit that I'm a bit rushed to offer up any code at the moment, but here's a pretty good article that explains how to use ObservableCollections and classes that implement INotifyPropertyChanged . It also has code examples, which although in VB.NET should give you enough of an idea to get started.

In effect you separate your code into distinct layers UI (View), business logic (View Model) and data layer (Model where your entity framework resides).

You bnd your datagrid to the ObservableCollection type property in your Customers class and your edit csutomer window is bound to as instance of your Customer class.