Managing Multiple selection in View Model (.NET Metro Style Apps)

Fun@learn

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29 Jun 2012CPOL3 min read

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This article provides Attached Behavior based approach to manage Multiple Selection in Collection Based UI control from the View Model. All the code in this article is strictly applicable to Win 8 metro style apps. Though the Behaviors can be easily adapted to WPF/Silverlight.

Multiselect_in_VM.zip
- Multiselect in VM
  - ~$ltiselect Binding in ViewModel-Metro.docx
  - ~$w Microsoft Word Document.docx
  - Ext
    - winrtbehaviors-14177.zip
    - winrtbehaviors-14177
  - Multiselect Binding in ViewModel-Metro.docx
  - MultiselectSample
    - depend
      - GalaSoft.MvvmLight.Win8.dll
      - WinRtBehaviors.dll
    - MultiselectSample.sln
    - MultiselectSample
      - App.xaml
      - App.xaml.cs
      - Assets
        
        Logo.png
        
        SmallLogo.png
        
        SplashScreen.png
        
        StoreLogo.png
      - bin
        
        Debug
        
        App.xaml
        
        AppX
        
        App.xaml
        
        AppxManifest.xml
        
        Assets
        
        Logo.png
        
        SmallLogo.png
        
        SplashScreen.png
        
        StoreLogo.png
        
        Common
        
        StandardStyles.xaml
        
        GalaSoft.MvvmLight.Win8.dll
        
        MainPage.xaml
        
        microsoft.system.package.metadata
        
        S-1-5-21-860198490-3370951563-2996008965-1001.pckgdep
        
        MultiselectSample.exe
        
        resources.pri
        
        vs.appxrecipe
        
        WinRtBehaviors.dll
        
        WinRtExt.dll
        
        AppxManifest.xml
        
        Common
        
        StandardStyles.xaml
        
        GalaSoft.MvvmLight.Win8.dll
        
        MainPage.xaml
        
        MultiselectSample.build.appxrecipe
        
        MultiselectSample.exe
        
        resources.pri
        
        WinRtBehaviors.dll
        
        WinRtExt.dll
        
        WinRtExt.pri
      - Common
        
        StandardStyles.xaml
      - MainPage.xaml
      - MainPage.xaml.cs
      - MainPageViewModel.cs
      - MultiselectSample.csproj
      - MultiselectSample_TemporaryKey.pfx
      - obj
        
        Debug
        
        Common
        
        intermediatexaml
        
        TempPE
      - Package.appxmanifest
      - Properties
        
        AssemblyInfo.cs
    - Steps.txt
    - WinRtBehaviors
      - Behavior.cs
      - BehaviorOfT.cs
      - bin
        
        Debug
        
        WinRtBehaviors.dll
        
        WinRtBehaviors.pri
      - EventAsync.cs
      - Interaction.cs
      - obj
        
        Debug
        
        TempPE
      - Properties
        
        AssemblyInfo.cs
      - WinRtBehaviors.csproj
      - WinRtBehaviors.csproj.vspscc
      - WinRtBehaviors.sln
      - WinRtBehaviors.vssscc
    - WinRtExt
      - Behavior
        
        MultiSelectBehavior.cs
      - bin
        
        ARM
        
        Debug
        
        Release
        
        Debug
        
        WinRtBehaviors.dll
        
        WinRtBehaviors.pri
        
        WinRtExt.dll
        
        WinRtExt.pri
        
        Release
        
        x64
        
        Debug
        
        Release
        
        x86
        
        Debug
        
        Release
      - obj
        
        Debug
        
        TempPE
      - Properties
        
        AssemblyInfo.cs
      - WinRtExt.csproj
  - ori
    - MultiSelectBehavior.cs

1. Define SelectedItems property in ViewModel
2. Define behavior in control
3. In the behavior, bind SelectedItems (part of Behavior) to SelectedItems (part of view model)

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License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Written By

Fun@learn

Software Developer (Senior)

India

Software Engineer based out in Noida.

Technology skillset – .NET, WPF, WCF, LINQ, XAML.

Started blogging on http://1wpf.wordpress.com/

Stackoverflow Profile -> http://stackoverflow.com/users/649524/tilak

Managing Multiple selection in View Model (.NET Metro Style Apps)

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