Gr S Cross-platform mobile development with c# 

About Me Greg Shackles Senior Software Engineer OLO Online Ordering email [email protected] twitter @gshackles github github.com/gshackles blog gregshackles.com Slides speakerdeck.com/u/gshackles 

the Book oreil.ly/Lp5smR Discount Code: AUTHD Print Book: 40% Off E-Book: 50% Off 

Market Share (US): April 2012 Google Apple RIM Microsoft Symbian 50.8% Android 31.4% Apple 11.8% RIM 4.0% Microsoft Source: comScore 

native platform Languages Objective-C Java C# 

Write once, run anywhere 

platform differences != != 

c# Everywhere MonoTouch Mono for Android Native 

The Power of C# 

The Power of C# •Base Class Library 

The Power of C# •Base Class Library •LINQ 

The Power of C# •Base Class Library •LINQ •Parallel LINQ 

The Power of C# •Base Class Library •LINQ •Parallel LINQ •Memory Management 

The Power of C# •Base Class Library •LINQ •Parallel LINQ •Memory Management •Task Parallel Library 

The Power of C# •Base Class Library •LINQ •Parallel LINQ •Memory Management •Task Parallel Library •Dynamic 

xamarin Tools xamarin.com 

xamarin Tools xamarin.com •Access to full platform SDKs 

xamarin Tools xamarin.com •Access to full platform SDKs •100% Native 

xamarin Tools xamarin.com •Access to full platform SDKs •100% Native •Linker 

xamarin Tools xamarin.com •Access to full platform SDKs •100% Native •Linker •frequent releases 

xamarin Tools xamarin.com •Access to full platform SDKs •100% Native •Linker •frequent releases •active community 

xamarin Tools xamarin.com •Access to full platform SDKs •100% Native •Linker •frequent releases •active community •Improved API 

CFStringRef  keys[]  =  {        kCTFontAttributeName,        kCTForegroundColorAttributeName };   CFTypeRef  bval[]  =  {        cfListLineCTFontRef,        CGColorGetConstantColor(kCGColorBlack) };   attr  =  CFDictionaryCreate  (        kCFAllocatorDefault,        (const  void  **)  &keys,  (const  void  **)  &bval,        sizeof(keys)  /  sizeof(keys[0]),  &kCFTypeDictionaryKeyCallBacks,        &kCFTypeDictionaryValueCallBacks);   astr  =  CFAttributedStringCreate( kCFAllocatorDefault,  CFSTR("Hello  World"),  attr); obj-c 

C# CFStringRef  keys[]  =  {        kCTFontAttributeName,        kCTForegroundColorAttributeName };   CFTypeRef  bval[]  =  {        cfListLineCTFontRef,        CGColorGetConstantColor(kCGColorBlack) };   attr  =  CFDictionaryCreate  (        kCFAllocatorDefault,        (const  void  **)  &keys,  (const  void  **)  &bval,        sizeof(keys)  /  sizeof(keys[0]),  &kCFTypeDictionaryKeyCallBacks,        &kCFTypeDictionaryValueCallBacks);   astr  =  CFAttributedStringCreate( kCFAllocatorDefault,  CFSTR("Hello  World"),  attr); obj-c var  attrs  =  new  CFStringAttributes  {        Font  =  listLineCTFont,        ForegroundColor  =  UIColor.Black.CGColor };   var  astr  =  new  NSAttributedString  ("Hello  World",  attrs); 

            findViewById(R.id.button).setOnClickListener( new  View.OnClickListener()          {                @Override      public  void  onClick(View  v)      {              //  handle  click      }        } ); Java 

C#             findViewById(R.id.button).setOnClickListener( new  View.OnClickListener()          {                @Override      public  void  onClick(View  v)      {              //  handle  click      }        } ); Java [Activity(Label="@string/AppName",  MainLauncher=true)] FindViewById(Resource.Id.Button).Click  +=  delegate   {   //  handle  click }; 

Environment: iOS Mac OS X MonoDevelop Xcode Integration 

Environment: android Mac OS X Windows MonoDevelop Visual Studio 

UI Designer: MonoDevelop and Visual Studio Environment: android 

Environment: windows phone Windows Visual Studio 

Some Apps ...and many more! icircuit rdio gmusic c# to go infinite flight mwc 2012 

Benefits 

•Powerful and mature language Benefits 

•Powerful and mature language •Skill reuse Benefits 

•Powerful and mature language •Skill reuse •Native apps Benefits 

•Powerful and mature language •Skill reuse •Native apps •Code reuse across platforms Benefits even non-mobile platforms! 

app Architecture UI# C## Run)me# Pla/orm# Silverlight# Business#Logic# .NET# WP7# iOS# Mono# Android# MonoTouch# Mono#for# Android# 

What code can be shared? 

What code can be shared? •Most non-UI or platform code 

What code can be shared? •Most non-UI or platform code •Core application logic 

What code can be shared? •Most non-UI or platform code •Core application logic •Entities 

What code can be shared? •Most non-UI or platform code •Core application logic •Entities •LINQ (objects, XML) 

What code can be shared? •Most non-UI or platform code •Core application logic •Entities •LINQ (objects, XML) •Network access 

What code can be shared? * with some limitations •Most non-UI or platform code •Core application logic •Entities •LINQ (objects, XML) •Network access •File / Database Access * 

sharing techniques 

sharing techniques •File Linking 

sharing techniques •File Linking •Abstraction 

sharing techniques •File Linking •Abstraction •Observer Pattern 

sharing techniques •File Linking •Abstraction •Observer Pattern •Partial Classes and Methods 

sharing techniques •File Linking •Abstraction •Observer Pattern •Partial Classes and Methods •Conditional Compilation 

sharing techniques * currently in development •File Linking •Abstraction •Observer Pattern •Partial Classes and Methods •Conditional Compilation •portable class libraries * 

library: xamarin.mobile Supports iOS, Android and Windows Phone xamarin.com/mobileapi 

Demo Time 

Questions?