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Add version 4 components to your Silverlight 3 application with MEF

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The current Silverlight version is v3, with v4 in the making (in Beta 1 at the time of this posting). Silverlight 4 is bringing a lot of new features in the core framework and to use them, you would have to migrate your applications to the latest version, once it gets released. And that would require all the potential users to upgrade their machines to the latest version as well.

But there’s another way. By using MEF (Managed Extensibility Framework), you can extend your existing Silverlight 3 application with optional package, which would contain Silverlight 4 components only.

Here’s an example: user can select an image file from your local disk in Silverlight 3 only through an OpenFileDialog, while with the new drag/drop feature in Silverlight 4, she would be able drag a picture from the file system and drop it onto the application. Why not allow those with Silverlight 4 installed do it the easy way?

by Andrej Tozon        more here


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