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Microsoft shows off Silverlight 4's feature list at PDC

The technology will feature improved startup times and more capabilities for running applications outside of a browser

By Paul Krill, InfoWorld
November 18, 2009 04:21 PM ET

InfoWorld - Microsoft revealed on Wednesday ambitious plans for the next version of its Silverlight browser plug-in technology for rich Internet applications, including faster startup times and software development improvements as well as more capabilities for running applications outside of a browser.

Dubbed Silverlight 4, a beta release of the upgrade was made available for download on Wednesday. A final release is due in the first half of next year. Silverlight 4 was discussed at the Microsoft Professional Developers Conference (PDC) in Los Angeles. Company officials Wednesday also discussed Windows 7 and revealed the beta releases of Office 2010 and SharePoint Server 2010.

[ See InfoWorld's report on the July release of Silverlight 3. | For all the latest news from the Professional Developers Conference, check out InfoWorld's PDC page. ]

Silverlight 4 features a 30-percent faster startup time and new profiling support, said Scott Guthrie, corporate vice president of the Microsoft .Net Developer Platform. Version 4 will support the same OSes and browsers as in previous releases as well as the Google Chrome browser.

"We're improving startup by more than 30 percent for common scenarios, sometimes up to 80 percent," Gutrhie said.

HTML hosting capabilities are included in Silverlight 4. "You can actually now host HTML as a control within your applications," Guthire said. The upgrade also features other new controls and extends controls based on user requests.

With Silverlight 4 and .Net Framework, an assembly can be compiled once and run on both technologies.

Out-of-browser improvements for Silverlight 4 include Windows APIs and notification popup support. Trusted applications can be run outside the Silverlight 4 sandbox on Windows and Mac systems, with a user consent dialog featured.

Other capabilities in Silverlight 4 include data-binding improvements, UDP (User Datagram Protocol) and multicast support. REST enhancements are featured along with improvements pertaining to Windows Communication Foundation and rich Internet applications.

Accompanying Silverlight 4 will be design improvements in the upcoming Visual Studio 2010 software development platform release, including a full WYSIWIG design surface as well as XAML and Intellisense capabilities.

To better enable development of business applications, version 4 features support for programmatic printing, right-click support, and rich text editing as well as programmatic access to the clipboard and built-in mouse wheel support for Silverlight capabilities. Custom print dialogs are enabled also.

"We're also adding features like implicit styling support so you can consistently style all the controls within your app," Guthrie said.

Silverlight 4 offers access to microphones, Webcams, audio and video input and multicast streaming. Digital rights management is featured as well. Microsoft, Guthrie said, has been on "very fast release cadence" with Silverlight, offering the first three releases in the space of 22 months. Silverlight 4 continues this pattern, he said.

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