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All communication from within the Silverlight application is done asynchronously because of the Silverlight development team s decision to use the browser s networking API, and to keep the APIs tight with only one way to accomplish any given task. The most common way of making asynchronous calls requires a few simple steps, which we ll detail in the following section. Typically, all you need to do is create an event handler to be executed when the call returns. If you want to create a more synchronous experience for your application, you can enable some kind of blocking element, such as a download-progress animation, when the call begins and then remove it once the request has returned its data. We ll discuss how to create animations in chapter 22. Note that the asynchronous behavior can occur on multiple threads, a fact that can cause trouble when you aren t aware of it. In section 14.2.2, we ll point out where you need to be careful with which thread you re on, and show you a technique to avoid trouble. Now that we have the basics out of the way, let s get to the point of this chapter: connecting to data sources.
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14.2 Connecting to data sources
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Nearly every application built today, even using Silverlight, needs data to accomplish its goal. In chapter 11, you saw how to take data and bind it to properties on controls, but where does that data come from Because Silverlight executes on the client, often on the other side of a firewall, it doesn t have direct access to a database as do server-based technologies such as ASP.NET. To get access to the data from within Silverlight, you need to use a proxy of some sort, typically a web service. A web service is a resource made available to clients using a defined protocol. Most web services fall into two categories: SOAP and REST. We ll explain these popular formats, and how to use them, in this section.
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14.2.1 Using SOAP services
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When you think of a classic web service, you re thinking about SOAP. SOAP services follow a strict protocol that defines the format in which messages are passed back
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Connecting to data sources
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and forth. Silverlight has great support for SOAP Services, supporting the WS-I Basic Profile 1.0 (SOAP 1.1 over HTTP), SOAP 1.2, and WS-Addressing 1.0, as well as a small subset of WS-Security. Using SOAP services in Silverlight allows for both the simplest implementation and most powerful data-transfer mechanism of any service type through the use of the service reference. Over the next few pages, you ll create a proxy object for the service, call a method on it, and download the results. After you ve created and used a proxy to connect to a SOAP service, you ll be amazed at how simple yet powerful this capability is.
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SOAP originally stood for Simple Object Access Protocol, but that definition fell into disuse and was officially dropped with version 1.2 of the W3C SOAP standard.
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NOTE
SERVICE REFERENCES
The easiest way to connect to a service is through a service reference proxy. If the web service you re connecting to supports Web Services Description Language (WSDL), Visual Studio can read that information and create a proxy in your application for you. Creating a service reference in your Silverlight application takes three simple steps:
In Visual Studio 2010, right-click your Silverlight project and choose Add Service Reference. This brings up the Add Service Reference dialog box. On this form, you can either type in the URI of the service you wish to connect to and click the Go button or, if the services are part of the same solution, click the Discover button. Either option tells Visual Studio to poll the chosen location for available services and analyze their signatures. When the services have been displayed, you can open them and look at what methods are available on each service. You can then enter in the text box a namespace by which you want to refer to the service and click OK to create the proxy. You can modify more advanced settings either by clicking the Advanced button in the previous dialog or by right-clicking the service reference and selecting Configure Service Reference. One particularly useful capability of this form is the ability to change the collection types returned by the service. The default collection type can vary depending on the service you re connecting to, but you can also change it to use other collection types, even generics.
When the service reference is created, Visual Studio also adds references to the System.Runtime.Serialization and System.ServiceModel assemblies. These are used by Silverlight in connecting to web services and in serializing and deserializing the SOAP message. When you ve created your service reference, it s easy to use for both sending and receiving data. First, let s talk about calling SOAP services using the service reference you just created.
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