Windows Phone: multitasking and local database

Multitasking and Local Dababase inWindows Phone Mango Radu Vunvulea

Windows Phone Mango Multitasking

Multitasking Fast App Switching

Multitasking and Phone Health

Application Lifecycle Reload / refresh state only if neededApplication is resident inmemory; system detaches Save state butresources and pauses threads do not discard it

Background transfer 20 20 MB MB 100 Unlimited MB

End-to-End ArchitectureDeveloper Application OSMyApp Solution MyApp.dll MyApp Project UX SingleWMAppManifest Logic App Cloud ISO Store System Services MyAppAgent Project MyAppAgent.dll

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

Differences Between AgentsPeriodic 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.

Windows Phone Mango Local Database

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

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.

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.

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

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

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

Windows Phone: multitasking and local database

by Radu Vunvulea on Nov 25, 2011

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