Samples

This article is Part 4 of the series WCF RIA Services:

1. Getting Started with WCF RIA Services
2. Querying Data Through WCF RIA Services
3. Updating Data Through WCF RIA Services
4. WCF RIA Services and MVVM
5. Metadata Classes and Shared Code in WCF RIA Services
6. Validating Data with WCF RIA Services 
7. Authenticating and Authorizing Calls in WCF RIA Services
8. Debugging and Testing WCF RIA Services Applications
9. Structuring WCF RIA Services Applications
10. Exposing Additional Domain Service Endpoints for Other Clients

Introduction

In this article, I am going to quickly cover the metadata and shared code facilities of WCF RIA Services.

Introduction

As you probably know there is no DataGrid available under the Silverlight for Windows Phone platform at the moment. One could object that a DataGrid in Windows Phone is not so much requested for a lot of reasons, size of the screen, user input mode etc. This is true but it is also true that new projects regarding local databases appear day by day on the horizon (i.e. Perst for WP7 , Windows Phone 7 Database) and this opens the space for the development of a class of business applications, even for small devices.

This article is Part 4 of the series WCF RIA Services:

1. Getting Started with WCF RIA Services
2. Querying Data Through WCF RIA Services
3. Updating Data Through WCF RIA Services
4. WCF RIA Services and MVVM
5. Metadata Classes and Shared Code in WCF RIA Services
6. Validating Data with WCF RIA Services 
7. Authenticating and Authorizing Calls in WCF RIA Services
8. Debugging and Testing WCF RIA Services Applications
9. Structuring WCF RIA Services Applications
10. Exposing Additional Domain Service Endpoints for Other Clients

Introduction

The Model-View-ViewModel pattern (MVVM) is a very popular approach for building more loosely coupled Silverlight and WPF applications.

1. The Problem

In this article I’ll show you a simple solution for navigation between pages in different Xaps, by using Managed Extensibility Framework (MEF). Recently I hit the following issue, while playing with MEF. Suppose that you have a Silverlight Navigation Application. Your application is partitioned in different modules (plugins, extensions, add-ons or whatever). Let's imagine that 
your application has three plugins – Orders plugin, Products plugin and Suppliers plugin, as shown on the snapshot below.

In this third and last part of the duplex story in Silverlight, we’ll take a look at the third option offered by Silverlight to perform duplex communication.

Let’s quickly review the first two options. In Part 1, we looked at the Http Polling Duplex binding. Using a continuous polling mechanism on the network layer, this binding makes it possible to create an illusion of duplex communication. The big plus of this binding is the possibility we have to use it in internet scenarios, since all communication goes over plain HTTP.

In the first part of this series on duplex communication in Silverlight 4, we did a deep dive in one of the available options offered by the platform, namely the Http Polling Duplex binding. It’s advised that you read that article first, since this second part continues where we left of in the first part.

To summarize the first part quickly, we saw that Silverlight applications in some situations can really benefit from duplex communication. In scenarios where the client needs to be updated because of changes in the state of the server side (for example a change in a database, a file change…), the best solution is working duplex.

Introduction

In the previous article (Displaying geo-referenced Flickr images in Silverlight 4 using Bing Maps) we covered how to retrieve photos from Flickr using their API, and displaying them on a map (Microsoft’s Bing Maps control). In this article, I’ll be showing you how to upload your own photos to Flickr, and geo-tagging them.

The FlickrNet library

Sam Judson has a library on Codeplex for accessing Flickr services from .NET, called FlickrNet.

This article is Part 2 of the series Silverlight Applications with Telerik OpenAccess ORM

• WCF RIA Applications with Telerik OpenAccess ORM Part I: The Basics
• WCF RIA Applications with Telerik OpenAccess ORM Part II: Create, Update, Delete and Validation
• Introducing Telerik OpenAccess Data Service Wizard
• WCF Data Services with Telerik OpenAccess ORM
• WCF End Points Services with Telerik OpenAccess ORM
• Silverlight Applications for Windows Azure with Telerik OpenAccess ORM Part I: Connection to SQL Azure
• Silverlight Applications for Windows Azure with Telerik OpenAccess ORM Part II: Developing the Silverlight Client and Deploying the Application

1.

Introduction

This tutorial will guide you through creating your own application to display geo-tagged Flickr images on a Bing Maps backdrop in Silverlight 4.

The components

Flickr Web Services

Flickr exposes a variety of services to access their database of public images, in REST (see this article), SOAP (read here) and RPC (here) formats. For more details, go to their API documentation. A detailed explanation of accessing RESTful services is outside the scope of this article, but, in essence is involves generating a url, downloading the result as a string (the Flickr REST service returns an XML file), and then parsing it to get the info we want.

Introduction

In this article I will show you how to capture a “screenshot” of a Silverlight application. Fortunately, since Silverlight 3, this is straight-forward to do with the WriteableBitmap class. I’m also going to show how to use the screen capture for special effects, or for saving to file as a JPG. This article is aimed at developers who are fairly new to Silverlight.

Here is a Silverlight app that demonstrates the approach we are going to use:

You can grab the source here.