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Creating Mobile Apps with Xamarin.Forms Preview Edition 2 (Developer Reference) eBook Kindle
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This book is very thorough - tediously so at times. That's not a bad thing - I think it's worth spending significant time on the subtleties of layout. Consistently providing full, matching examples for iOS, Android, and Windows Phone is also important. Overall I think this is the ideal book for promoting an architecture that is somewhat lacking.
I'm sure that one day, Xamarin Forms will be superb. Right now I have to compare it unfavorably with WPF and other more mature Visual Studio technologies. One problem is that it is changing rapidly, and the project templates and features in Visual Studio 2017 don't match the book very well. On the other hand, Xamarin Forms has a long way to go before I would consider using it in a production environment so it needs to be changing rapidly. I don't blame the book for this, but it makes it difficult to follow along when so many of the books techniques are already deprecated.
Xamarin Forms also has very limited intellisense and will simply fail without an error message if you make a small mistake. For example "x:static" instead of "x:Static" causes InitializeComponent to hang without any indication of the problem. And remember, there is no intellisense, no editor highlight, no compile or run-time error. You frequently just have to start undoing your changes until it starts working again. But this is a criticism of Xamarin Forms - not the book.
My criticism of the book is related to the fact that XAML is not introduced until you are almost 1/4 of the way through the book. Building the entire page content in one massing constructor is a really weird way of doing things that isn't very useful or realistic.
You can obtain the latest version of the book which is much bigger and more current by searching for "Creating Mobile Apps with Xamarin.Forms Book First Edition". You can download it from xamarin dot com for free. I hope they get it on Amazon soon.