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Introduction to portable class libraries

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Michael John Pe単a
Michael John Pe単a

Portable class libraries (PCLs) allow sharing code across platforms like Windows, Xamarin, and others. A PCL contains code common to selected platforms; it is sliced into platform-specific libraries. PCLs are commonly used for data access, services, view models, utilities, and unit tests. Frameworks like MVVM Light and Json.NET support PCLs. If code can't be shared, platform indirection with a common interface and runtime reflection can achieve similar business logic.

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INTRODUCTION TO PORTABLE CLASS LIBRARIES MICHAEL JOHN T PENA DEVELOPER / CONSULTANT
ABOUT ME Agile Developer at Accenture Inc Avanade PDC Technology Enthusiast Startup Enthusiast Mentor to Students Loves Wine
ADVENT OF DIFFERENT PLATFORMS Windows 10 Xamarin Desktop / Core .NET Xbox One Silverlight
THE CHALLENGE Sharing code between platforms were not that simple Each platform have a designated Class Library Shared Project is still limited
ORIGIN OF PCL Microsoft created a Visual Studio extension for VS2012 / VS2013
HOW IT WORKS? You tick the platforms you like to support. Then that portable class library will be sliced into those libraries which are common to them.
VISUALIZATION Windows 10 Xamarin PCL
WHERE DO WE USUALLY USE PCL? Sharing Data Access and Service Layer of Apps Sometimes on ViewModels Sharing Common Utilities and Helper Classes Just One Unit Test for shared Functionalities
SOME LIBRARIES THAT WORKS WITH PCL MVVM Light Json.NET Microsoft HTTP CLIENT Libraries (Microsoft.Net.Http / HttpClient)
SPECIAL CASE: WHAT IF YOU CANNOT SHARE CODE BUT HAVE SAME BUSINESS LOGIC? Platform Indirection. You create custom code for that platform, but still extends the same Interface. You use reflection to resolve the class at run time.
QUESTIONS AND ANSWERS? CONTACTS www.fb.com/mjtpena www.linkedin.com/michaelpena mjtpena@outlook.com @mjtpena

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Introduction to portable class libraries

  • 1. INTRODUCTION TO PORTABLE CLASS LIBRARIES MICHAEL JOHN T PENA DEVELOPER / CONSULTANT
  • 2. ABOUT ME Agile Developer at Accenture Inc Avanade PDC Technology Enthusiast Startup Enthusiast Mentor to Students Loves Wine
  • 3. ADVENT OF DIFFERENT PLATFORMS Windows 10 Xamarin Desktop / Core .NET Xbox One Silverlight
  • 4. THE CHALLENGE Sharing code between platforms were not that simple Each platform have a designated Class Library Shared Project is still limited
  • 5. ORIGIN OF PCL Microsoft created a Visual Studio extension for VS2012 / VS2013
  • 6. HOW IT WORKS? You tick the platforms you like to support. Then that portable class library will be sliced into those libraries which are common to them.
  • 8. WHERE DO WE USUALLY USE PCL? Sharing Data Access and Service Layer of Apps Sometimes on ViewModels Sharing Common Utilities and Helper Classes Just One Unit Test for shared Functionalities
  • 9. SOME LIBRARIES THAT WORKS WITH PCL MVVM Light Json.NET Microsoft HTTP CLIENT Libraries (Microsoft.Net.Http / HttpClient)
  • 10. SPECIAL CASE: WHAT IF YOU CANNOT SHARE CODE BUT HAVE SAME BUSINESS LOGIC? Platform Indirection. You create custom code for that platform, but still extends the same Interface. You use reflection to resolve the class at run time.
  • 11. QUESTIONS AND ANSWERS? CONTACTS www.fb.com/mjtpena www.linkedin.com/michaelpena mjtpena@outlook.com @mjtpena