Can Silverlight be used across platforms, out of browser, with local relational database?

My experience has been Windows Forms in VB, using SQL Server as a back end, and Windows Phone Silverlight, with which I have not used any data services other than Isolated Storage. I need to create an application for both PC and Mac (no Mac experience at all). The application will need to use local, relational da开发者_如何学Gota - nothing online, data stored on the local machine.

I was thinking I would have to learn Mac development, but then it occurred to me that Silverlight is cross-platform. Keeping in mind that my only Silverlight experience is with a couple of Windows Phone apps (simple ones), can I use Silverlight to develop an out-of-browser application that will run on both Windows and Mac, and be able to access a local database on the machine? If yes, what database can I use, since I'm sure SQLExpress, which I had been thinking of for the PC version, will not work on Mac?

The database could potentially get rather large, and I've never used XML to store data before, so I'm not sure if XML is the way to go. Thanks in advance.

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Yes, you can create a Silverlight application that is cross-platform and has a local relational database. This is what a lot of the original Silverlight work I did was. I created a local database (open source, no cost) for that exact purpose - it's called Sterling and is available at http://sterling.codeplex.com. With that you can write applications in Silverlight that will run on both Windows and Mac OSX systems.

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As far as I know the Silverlight browser plugin is cross platform not for out of browser application. You can't use ms sql server for this. There are a number of databases you can use. Mysql, SQLite, ... that are cross platform. The latter one is really fast but I'm not sure it is suitable for a larger database.

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Silverlight is a client side technology. The out of browser application works on both Windows and Mac and you can use a SOAP/WCF/REST webservice to work with the data. If your database is very small it would still be feasible to use databases that can work out of IsolatedStorage.