1. Multitasking and
Local Dababase in
Windows Phone Mango
Radu Vunvulea

2. Windows Phone Mango
Multitasking

3. Multitasking
Fast App Switching

4. Multitasking and Phone Health

5. Application Lifecycle
Reload / refresh
state only if
needed
Application is resident in
memory; system detaches Save state but
resources and pauses threads do not discard
it

6. Application Lifecycle
Reload / refresh
state only if
needed
Application is resident in
memory; system detaches Save state but
resources and pauses threads do not discard
it

7. Background transfer
20
20 MB
MB
100 Unlimited
MB

8. End-to-End Architecture
Developer Application OS
MyApp Solution MyApp.dll
MyApp Project
UX Single
WMAppManifest Logic App
Cloud ISO Store System
Services
MyAppAgent
Project
MyAppAgent.dll

9. Demo

10. Background Agents
Ce ne este permis: Ce nu ne este permis:
• Base API • Librarii XNA
• Update de tile • Audio
• Toasts • Senzori
• Location • Microfon
• Networking • Camera
• Storage • UI

11. Differences Between Agents
Periodic Agent
• Runs every 30 minutes • Runs on external power
• Any network connection • Non-cell network
• Runs for 25 seconds connection
• Used for location, data • Runs for 10 mins, recurring
sync, etc. • Used for daily tasks, large
data syncs, etc.

12. Windows Phone Mango
Local Database

13. Where is database stored
Application Isolated
Storage
LINQ to SQL Runtime
Data Context
(Sistem.Data.Linq) Local
Database

14. Good to know
• Isolated Storage is used to store database files
• LINQ to SQL is used as the ORM engine
• LINQ is used to query data
• Only System.Data.Linq assembly must be
added to the project.

15. Database design
• Custom connection string format:
Data Source='isostore:/MyDir/DbName.sdf'
"Data Source='isostore:/MyDir/DbName.sdf'"
• T-SQL queries are not supported
• The code-first approach to defining the
database schema is preferred in this version
of Windows Phone 7.1 Mango.

16. Limitations
• ADO.NET Objects are not supported
• Skip() and Take() require an ordered list and
constants values
• Only Microsoft SQL CE data types are
supported
• BinaryFormatter is not supported by default
(hack: CustomType and implement ToString() and Parse() in your custom
class)
• ExecuteCommand is not suported – NO T-
SQL, NO DML statement, NO DDL

17. Process to follow to use SQL CE
Implement all database classes: Create a new database (.sdf) file in Isolated Populate the database stored in the Isolated
tables, columns, relations, datacontext, etc Storage(by default the database is empty) Storage with data

18. Code Sample

19. Questions

20. Multumesc
Radu Vunvulea
vunvulear@gmail.com
vunvulearadu.blogspot.com