Today we are releasing CTP2 of the next version of the WCF Data Services libraries.  This release targets .NET 4 and Silverlight 4 and includes new client and server features in addition to those that shipped as part Oct 2010 CTP1 .  ...

What is a derived property? A derived property is a property that does not exist on the EntityType associated with the EntitySet; rather it exists on a type that derives from the base type of the entity set. This feature has been among our customers top...

Today we are announcing a new project called ‘datajs’, a cross-browser JavaScript library that enables web applications to do more with data. datajs leverages modern protocols such as JSON and OData as well as HTML5-enabled browser features...

This post creates a Windows Phone 7 client application for the OAuth 2.0 protected OData service we created in the last post . Prerequisites: To run this code you will need: An AppFabric Access Control Services (ACS) instance & OData Service...

In this post you will learn how to create an OData service that is protected using OAuth 2.0, which is the OData team’s official recommendation in these scenarios: Delegation: In a delegation scenario a third party (generally an application...

A lot of our customers have asked us how to cache results from their Data Service. Which is why I want to point you to this excellent post by Peter Qian (a developer on the Data Services team) that shows you how to setup ASP.NET output caching. It...

Problem Statement: In previous versions, the WCF Data Services .NET and Silverlight client libraries always assumed that all collections (aka entity sets) had the same base URI. This assumption was in place because the library used the URI provided...

1.      Problem: In the previous version, WCF Data Services introduced the feed customization feature. This feature enabled users to map properties to certain elements in the Atom document. As an example, users could map a name property...

One of the new WCF Data Services features in the October 2010 CTP is something called Named Resource Streams. Background Data Services already supports Media Link Entries which allows you to associate a single streamed blob with an entry.   For example...

Although you may see both the terms, “Bags” and “Multi-Valued Property”, they refer to the same thing. While this naming change was not included with the latest WCF Data Services 2010 October CTP release, based on community feedback, we’ve decided to...

  Today, at the PDC , we announced that a production-ready version of the WCF Data Services client for Windows Phone 7 is available for download from http://odata.codeplex.com .  This means that it is now simple to create an app that connects...

Background As described recently on the Windows Live team blog , programming against your Windows Live artifacts (Calendar, Photos, etc) is now possible using OData. This blog post will walk through how to use our recently released WCF Data Services CTP...

Today we are releasing CTP1 of the next version of the WCF Data Services libraries.  This release targets .NET 4 and Silverlight 4 and includes new client and server features in addition to those that shipped as part of .NET 4 & SL4.  With...

We’ve received a fair number of questions regarding our current CTP library for Windows Phone 7 and what our RTM plans are. The goal of this post is to address many of those questions by describing our plans for the coming months…. Background The CTP...

Over the weekend the ASP.NET team released a Microsoft Security Advisory about a security vulnerability found in ASP.NET: http://www.microsoft.com/technet/security/advisory/2416728.mspx The WCF Data Services team looked into the issue and don’t believe...

As we’ve posted a few times before on this blog the data services team is beginning to explore improvements and new features for our next release.  As part of this process, it’s critical that we hear your feedback, as it helps us ensure that what...

In this second post in the series on implementing a streaming data provider, we show how to use the WCF Data Services client library to access binary data exposed by an Open Data Protocol (OData) feed, as well as has how to upload binary data to the data...

OAuth WRAP is a claims based authentication protocol supported by the AppFabric Access Control (ACS) which is part of Windows Azure . But most importantly it is REST (and thus OData) friendly too. The idea is that you authenticate against an ACS server...

The Open Data Protocol (OData) enables you to define data feeds that also make binary large object (BLOB) data, such as photos, videos, and documents, available to client applications that consume OData feeds. These BLOBs are not returned within the feed...

Our goal in this post is to re-use the Forms Authentication already in a website to secure a new Data Service. To bootstrap this we need a website that uses Forms Auth. Turns out the MVC Music Store Sample is perfect for our purposes because: It uses...

You might remember, from Part 5 , that Basic Authentication is built-in to IIS. So why do we need ‘Custom’ Basic Authentication? Well if you are happy using windows users and passwords you don’t. That’s because the built...

Windows Azure and SQL Azure are the new Cloud service products from Microsoft. In this blog post, I am going to show you how you can take a database that is hosted in SQL Azure and expose it as OData in a rich way using WCF Data Services and Windows Azure...

In the last post we saw how to add custom authentication inside your Data Service using the ProcessingRequest event. Unfortunately that approach means authentication is not integrated or shared with the rest of your website. Which means for all...

If you secure an OData Service using Windows authentication – see Part 2 to learn how – everything works as expected out of the box. What however if you need a different authentication scheme? Well the answer as always depends upon your...

Today we released an OData Mailing List.  This is the list to use if you have OData questions, comments on OData or want to discuss how OData should evolve over time.  To sign up to the list go here and follow the instructions provided. ...