20
Cross Platform DevelopmentWindows 8 Windows Phone 8 Daniel Meixner
#dmxDevSession
Agenda
• Programmiermodelle
• Gemeinsamkeiten & Unterschiede
• Cross Plattform Strategien
Programmiermodell Windows 8
Programmiermodell Windows Phone 8
.NET API for
Windows
Phone
Windows
Phone
Runtime
Win32 &
COM
Managed Native
WP7.1 XAML & C#/VB
WP8.0 XAML & C#/VB
WP8.0 Games DirectX/Direct 3D & C++
WP7.1 XNA & C#/VB
WP8.0 XAML & C#/VB with Direct3D Graphics
+ C++
+ C++
Shared core
Full WinRT11,000 members
Windows Phone Runtime2,800 shared members
600 new members
Gemeinsamkeiten & Unterschiede
3/15/2013
Screen Size
Windows Phone
• 800x480, 1280x720, 1280x768Portrait, Landscape
Windows
• 1024x768 Portrait, Landscape, Snapped
Controls
Windows Phone
• Panorama, Pivot, ListPickerLongListSelector
Windows
• GridView, ListView, Semantic Zoom, FlipView
Lifecycle
Windows Phone
• Launched from start/apps list.Tombstones apps
Windows
• Resumes existing appsNo tombstoning
Cross Plattform Strategien (XAML/C#)
Reuse: Portable Class Library
Reusing pre-built components or libraries
3/15/2013Microsoft
confidential
9
• Portable Class Library
• Managed Code
• Reusable library
• One codebase with no conditional compilation
Shared Code: File-Level (Add as Link)
• App logic common to both apps, but not portable
• Code containing Windows Runtime API calls
• User controls with no platform dependencies
Shared Code: Classpart-Level (Partial Classes)
public partial class MyClass{
public void CommonMethodA(){
// code that is common}
public int CommonMethodB(){
int result = 0;// code that is commonreturn result;
}
}
public partial class MyClass{
public void PlatformSpecificMethod(){
// specific code for platform Á}
}}
public partial class MyClass{
public void PlatformSpecificMethod(){
// specific code for platform B}
}
Shared Code: Classpart-Level (Partial Classes)
• Very useful if amount of common code is large relative to the amount of platform-specific code
• I cannot specify what each platform-specific partial class should implement
Shared Code: Line Level (Conditional Compilation)
• can’t be shared in a Portable Class Library
• simple way to share code
• Complexity!
public class MyClass{
public void CommonMethodA(){
// code that is common to Windows Phone 8 and Windows 8}
public int CommonMethodB(){
int result = 0;// code that is common to Windows Phone 8 and Windows 8return result;
}
public void PlatformSpecificMethod(){
#if NETFX_CORE// code for Windows 8#else// code for Windows Phone 8#endif
}}
Shared UI: XAML Controls
• Limited to basic user controls
• Always build your user experience to suit the target platform!
<UserControl x:Class="MyApp.Shared.Controls.MyControl"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d"
d:DesignHeight="480" d:DesignWidth="480">
<Grid x:Name="LayoutRoot" Background="Black">
<StackPanel >
<TextBox x:Name="InputText"/>
<Button x:Name="SayHelloButton" Content="Say Hello!"/>
</StackPanel>
</Grid>
</UserControl>
public class MyWin8Class : MyBaseClass{
public override void PlatformSpecificMethod(){// Implement this method specific to Win 8}
} }
Patterns: Abstract Base Class
public abstract class MyBaseClass{
public void CommonMethodA(){
// code that is common}
public int CommonMethodB(){
int result = 0;
// code that is commonreturn result;
}
public abstract void PlatformSpecificMethod();}
Add as Link
Portable Class Library
public class MyWP8Class : MyBaseClass{
public override void PlatformSpecificMethod(){// Implement this method specific to WP8}
}
public class MyClass{
private IPlatformSpecificCode _platformImpl;
public MyClass(IPlatformSpecificCode platformImpl){
_platformImpl = platformImpl;}
public void CommonMethodA(){ ... }
public int CommonMethodB(){ ... }
public void PlatformSpecificMethod(){
_platformImpl.PlatformSpecificMethodImpl();}
}
public interface IPlatformSpecificCode{
void PlatformSpecificMethodImpl();}
// Windows 8 app projectpublic class MyWin8Implementation : IPlatformSpecificCode
{public void PlatformSpecificMethod(){
// Implemented for Windows 8}
}
Patterns: Interfaces
// Windows Phone app projectpublic class MyWinPhone 8Implementation : IPlatformSpecificCode
{public void PlatformSpecificMethod(){
// Implemented for Windows Phone 8}
}
Demo
Summary
• Shared design language
• Shared core
• Several approaches to share parts
3/15/2013Microsoft
confidential
1
8
Daniel MeixnerTechnical Evangelist
#dmxDevSession
Ping me!
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