Microsoft 9GD00001 manual Summary

298Microsoft Visual Studio 2010: A Beginner’s Guide

The crossdomain.xml policy was created for Adobe Flash applications and can be used with Silverlight applications too. Here’s an example:

<!DOCTYPE cross-domain-policy

SYSTEM "http://www.macromedia.com/xml/dtds/cross-domain-policy.dtd"> <cross-domain-policy>

<allow-access-from domain="*" /> <allow-http-request-headers-from domain="*" headers="*" />

</cross-domain-policy>

When designing Silverlight, Microsoft recognized that the crossdomain.xml file wasn’t flexible enough and added support for another type of policy called clientaccesspolicy.xml. Here’s an example:

<?xml version="1.0" encoding="utf-8"?> <access-policy>

<cross-domain-access> <policy>

<allow-from http-methods="*">" <domain uri="*"/>

</allow-from> <grant-to>

<resource path="/" include-subpaths="true"/> </grant-to>

</policy> </cross-domain-access>

</access-policy>

This clientaccesspolicy.xml listing allows all domains to access all site content that isn’t already secured by other means. You can restrict access by replacing the * in the domain uri with an allowable domain. Further, you can replace the resource path with a path on the site to restrict access to specific folders. Add more policy elements to this file to add more domains and paths.

Summary

This chapter explains how to run a Silverlight application. You learned how to use the MediaElement control and how to build UIs using the same techniques as in WPF. The OOB functionality allows you to run Silverlight from your desktop. A section describes deploying the Silverlight application to a Web server.

We’ve discussed a couple Web technologies already: ASP.NET MVC in Chapter 9 and Silverlight in this chapter. The next chapter shows you another Web technology: WCF Web services.