{"id":1373,"date":"2010-04-19T13:43:00","date_gmt":"2010-04-19T13:43:00","guid":{"rendered":"https:\/\/blogs.msdn.microsoft.com\/odatateam\/2010\/04\/19\/introduction-to-databinding-updated\/"},"modified":"2010-04-19T13:43:00","modified_gmt":"2010-04-19T13:43:00","slug":"introduction-to-databinding-updated","status":"publish","type":"post","link":"https:\/\/devblogs.microsoft.com\/odata\/introduction-to-databinding-updated\/","title":{"rendered":"Introduction to Databinding (Updated)"},"content":{"rendered":"

This blog post is an update to an introduction to the data binding capabilities we first added in Data Services v1.5 CTP1. We have taken the feedback received throughout the CTPs and made updates to the final design. Below is an update to the original binding post for CTP1 updated based on that feedback.<\/P>\n

Introduction to Data Binding<\/B><\/P>\n

A new collection type, DataServiceCollection, has been added to the client library which extends ObservableCollection and supports two way binding for client code. It is now possible to auto generate client side types that implement the INotifyPropertyChanged and INotifyCollectionChanged interfaces using the add service reference gesture. <\/P>\n

This means that, when data binding has been enabled, any changes made to contents of a DataServiceCollection or the entities in the collection will be reflected on the client context; any subsequent calls to SaveChanges() on that context will then persist those changes on the service. As well, any changes made to the entities in the context, through a subsequent query to the data service, will automatically be reflected on the items in the DataServiceCollection. <\/P>\n

This also means that the DataServiceCollection, because it implements the standard binding interfaces, can be bound as the DataSource to most WPF and Silverlight controls.<\/P>\n

Here are some examples of different ways to create a DataServiceCollection using the ADO.NET Data Services client library. In all of these examples, the queries are being executed against a service named \u201cnwsvc\u201d that exposes two types: products and suppliers that have a one-to-many relationship.<\/P>\n

Example 1: Creating a DataServiceCollection of all products.<\/P>\n\n\n\n
\n

DataServiceCollection<Products> products =
    new DataServiceCollection<Products>(
        from p in nwsvc.Products
        select p
    );<\/FONT> <\/P><\/TD><\/TR><\/TBODY><\/TABLE>\n

Example 2: Creating a DataServiceCollection of all products and their associated suppliers.<\/P>\n\n\n\n
\n

DataServiceCollection<Products> products =
    new DataServiceCollection<Products>(
        from p in nwsvc.Products.Expand(“Suppliers”)
        select p
     );<\/FONT> <\/P><\/TD><\/TR><\/TBODY><\/TABLE>\n

Walkthrough<\/B><\/P>\n

 <\/P>\n

The following is a walkthrough of using data binding in a WPF application. <\/P>\n

To get started, you’ll want to download all of the required software I use in the walkthrough:  <\/P>\n