• 
  Kevin Robinson
  

  0 points

  0 posts
  Sep 6, 2011, 04:03 PM

      Report Abuse

     

  I am try to use a datagrid on a user control an expose the itemsource property via a dependency property.   

  I am using Silverlight 4
  
  
  

  View Model

  
  Imports System.ServiceModel.DomainServices.Client
  Imports System.Collections.ObjectModel
  Imports GalaSoft.MvvmLight
  Imports GalaSoft.MvvmLight.Command
  Imports GalaSoft.MvvmLight.Messaging
  
  
  Public Class TimeSheetsViewModel
      Inherits ViewmodelBase
  
      Private WithEvents ctx As TimeSheetServiceContext = OPDomainContext.OPDomainContextInstance
  
  #Region "Properties"
  
      Private M_monday As New ObservableCollection(Of TIMESHEET)
      Public Property Monday As ObservableCollection(Of TIMESHEET)
          Get
              Return M_monday
          End Get
          Set(value As ObservableCollection(Of TIMESHEET))
              Me.M_monday = value
              RaisePropertyChanged("Monday")
          End Set
      End Property
      Public Property MondayLoading As Boolean = True
   
  #End Region
  
  #Region "Constructors"
      Public Sub New()
          ctx.Load(Of TIMESHEET)(ctx.GetTimeSheetsMondayQuery(), AddressOf MondayLoaded, Nothing)
      End Sub
  #End Region
  
  #Region "Private Methdods"
      Private Sub MondayLoaded(args As Loadoperation)
          Try
              Dim _TimeSheets As New ObservableCollection(Of TIMESHEET)
  
              For Each Timesheet As TIMESHEET In args.Entities
                  _TimeSheets.Add(Timesheet)
              Next
  
              Me.M_monday = _TimeSheets
        
              MondayLoading = False
          Catch ex As Exception
              ErrorWindow.CreateNew(ex.Message)
          End Try
      End Sub  
  #End Region
  End Class
  
  
  
  

  User Control

  
  
  Partial Public Class Ctrl_TimeSheetDataGrid
      Inherits UserControl
  
      Public Sub New()
          InitializeComponent()
      End Sub
  
      Public Property TimeSheetItemsSource() As ObservableCollection(Of TIMESHEET)
          Get
              Return DirectCast(GetValue(ItemsSourceProperty), ObservableCollection(Of TIMESHEET))
          End Get
          Set(value As ObservableCollection(Of TIMESHEET))
              SetValue(ItemsSourceProperty, value)
          End Set
      End Property
  
      Dim ItemsSourceProperty As DependencyProperty = DependencyProperty.Register("TimeSheetItemsSource", GetType(ObservableCollection(Of TIMESHEET)), GetType(Ctrl_TimeSheetDataGrid), New PropertyMetadata(New PropertyChangedCallback(AddressOf onItemsSourcePropertyChanged)))
  
      Private Sub onItemsSourcePropertyChanged(sender As Object, dp As DependencyPropertyChangedEventArgs)
          Me.dgMonday.ItemsSource = dp.NewValue
      End Sub
  End Class
  
  
  

  Using the user control

  
  <ds:Ctrl_TimeSheetDataGrid x:Name="dgMonday"  TimeSheetItemsSource="{Binding Monday}"/>

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• 
  Martin Mihaylov
  

  1092 points

  6 posts
  Sep 12, 2011, 06:14 PM

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  Hi, Kevin! Is the code, which you have posted here, not working? And if yes, what is the exception or the wrong behavior you get?
  
  Anyway, I can suggest you to use a custom control instead of user control in case of data-binding-scenarios, as it will spare you a lot of problems. Unless you have a specific reason to use a user control?
  
  Greets,
  Martin

  Reply
• 
  Pencho Popadiyn
  

  591 points

  17 posts
  Sep 13, 2011, 06:25 PM

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  Why you need to define the DataSource property in the ViewModel as a Dependency Property ? Just use a regular property, and everything should work perfect , I think :)

  Reply