Rob DeRosa - Seattle .NET Mobile MeetUp

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Building Sport with Xamarin.Forms and Azure

Building Sport with
Xamarin.Forms and Azure
Rob DeRosa
Director, Tech Sales
rob.derosa@microsoft.com

Sport is an app for iOS and Android that allows “athletes” to
join different leagues and challenge other members. The
winner of a challenge advances rank.
The back-end is written in C# using Azure App Services.
https://github.com/xamarin/sport
What is Sport?

Things I dig about Xamarin.Forms
• XAML, Bindings and XAMLC
• Inheritable Styles
• Mostly single-codebase for UITest code
• It’s Open-Source - unseal away!

Things I dig about Azure
• Offline Sync
• Remote Debugging
• Entity Framework / WebAPI

Things to be aware of with Xamarin.Forms
• XAML schema is not identical to Microsoft XAML schema (it’s close)
• No RelativeSource for bindings
• Cannot mix navigation stacks – let Forms own it
• Threshold of UI complexity where the difficulty of UI skyrockets

Things to be aware of with Xamarin.Forms

Things to be aware of with Azure
• Offline Sync does not support relational properties
• Relational property data is not sent back with DTO by default
– use ExpandHandlers
• Use SoftDelete if you want to update deleted records on the
client

Tips and Tricks for Xamarin.Forms
• Use static converters to reduce instances and lines of code
• Ensure a ViewModel-per-ContentPage pattern with generics
• Use a Busy class to denote progress
• New up ContentPage instances on a different thread to keep the UI
responsive.

Tips and Tricks for Azure
• config.IncludeErrorDetailPolicy = IncludeErrorDetailPolicy.Always
• Use Postman to inspect your REST/JSON payloads
• Use Charles/Fiddler to sniff our your traffic

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In this 24-minute webinar we discuss the practical approaches companies can take to effectively automate their test execution. In particular we will look at the evolution of test automation frameworks, the pros and cons of building your own test grid and the pros and cons of buying a commercial test grid, so you can make the right decision for the needs of you business. Watch the video at https://www.element34.com/assets/test-automation-buy-vs-build-strategic-impact

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In his book, The Nature of the Physical World, Sir Arthur Eddington commented that “We have to appeal to the one outstanding law — the second law of thermodynamics — to put some sense into the world.” This sense-making goes beyond the physical world, too. Entropy is also essential in the fields of information and communication theory. During this lecture for the Princeton Plasma Physics Laboratory, lecturer Andrea Goulet discussed the application of entropy-related concepts in two communication systems: software and collaborative teams. She examined how concepts that help us understand systemic statistical disorder, such as ergodic systems, Lyapunov exponents, Kolmogorov-Sinai entropy, and Shannon-entropy can help us optimize for both software quality and innovation. She also provided several domain-specific models: Lehman’s Laws and Conway’s Law for software, as well as new models from her own research that relate to entropy and innovation. Entropy helps us understand the world and achieve great things. There is an underlying beauty in its principles that we can use to advance scientific discovery. When we understand the subtleties related to balancing surprise and structure, we increase our chances for effective collaboration and finding novel solutions to complex problems.

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1. Building Sport with Xamarin.Forms and Azure Rob DeRosa Director, Tech Sales rob.derosa@microsoft.com

2. Sport is an app for iOS and Android that allows “athletes” to join different leagues and challenge other members. The winner of a challenge advances rank. The back-end is written in C# using Azure App Services. https://github.com/xamarin/sport What is Sport?

3. Things I dig about Xamarin.Forms • XAML, Bindings and XAMLC • Inheritable Styles • Mostly single-codebase for UITest code • It’s Open-Source - unseal away!

4. Things I dig about Azure • Offline Sync • Remote Debugging • Entity Framework / WebAPI

5. Things to be aware of with Xamarin.Forms • XAML schema is not identical to Microsoft XAML schema (it’s close) • No RelativeSource for bindings • Cannot mix navigation stacks – let Forms own it • Threshold of UI complexity where the difficulty of UI skyrockets

6. Things to be aware of with Xamarin.Forms

7. Things to be aware of with Azure • Offline Sync does not support relational properties • Relational property data is not sent back with DTO by default – use ExpandHandlers • Use SoftDelete if you want to update deleted records on the client

8. Tips and Tricks for Xamarin.Forms • Use static converters to reduce instances and lines of code • Ensure a ViewModel-per-ContentPage pattern with generics • Use a Busy class to denote progress • New up ContentPage instances on a different thread to keep the UI responsive.

9. Tips and Tricks for Azure • config.IncludeErrorDetailPolicy = IncludeErrorDetailPolicy.Always • Use Postman to inspect your REST/JSON payloads • Use Charles/Fiddler to sniff our your traffic