Question

Silverlight Listbox ItemsSource Error

Asked by: ALawrence007

Hi to all,

I created a Silverlight Listbox application that displays images of the members in my database. I added the Controls toolkit found on codeplex:
http://www.codeplex.com/Wiki/View.aspx?ProjectName=Silverlight

All was working until I added the toolkit and set the ItemsTemplate to Wrap Panel. I then get the following Error:
Items collection must be empty before using itemssource.

When I remove the following line all works fine again:
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<controlsToolkit:WrapPanel Width="Auto">
</controlsToolkit:WrapPanel>
</ItemsPanelTemplate>
</ListBox.ItemsPanel>

Can someone please let me know what I am doing wrong?

Thanks

<ListBox x:Name="MemberList"
                 ItemTemplate="{StaticResource MembersTemplate}"
                 Background="{StaticResource DefaultedBorderBrush}" 
                 VerticalAlignment="Stretch" 
                 d:LayoutOverrides="VerticalAlignment" 
                 Grid.Row="1"
                 ScrollViewer.VerticalScrollBarVisibility="Auto">
            <ListBox.ItemsPanel>
                <ItemsPanelTemplate>
                    <controlsToolkit:WrapPanel Width="Auto">
                    </controlsToolkit:WrapPanel>
                </ItemsPanelTemplate>
            </ListBox.ItemsPanel>
        </ListBox>
 
Data Template:
<DataTemplate x:Key="MembersTemplate">
            <Grid x:Name="MainGrid" Height="177" Width="356">
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="134"/>
                    <ColumnDefinition Width="0.5*"/>
                    <ColumnDefinition Width="0.5*"/>
                </Grid.ColumnDefinitions>
                <Grid Margin="0,0,0,0" Grid.Column="1" x:Name="NameGrid" Grid.ColumnSpan="2">
                    <Grid.RowDefinitions>
                        <RowDefinition Height="0.215*"/>
                        <RowDefinition Height="0.282*"/>
                        <RowDefinition Height="0.249*"/>
                        <RowDefinition Height="0.254*"/>
                    </Grid.RowDefinitions>
                    <TextBlock VerticalAlignment="Stretch" Text="{Binding Path=AccountNumber}" TextWrapping="Wrap" Margin="0,0,0,0" FontSize="22" Foreground="#FFFFFFFF" x:Name="FullNameTxt"/>
                    <TextBlock HorizontalAlignment="Left" VerticalAlignment="Stretch" Text="{Binding Path=FirstName}" TextWrapping="Wrap" Grid.Row="1" Margin="0,0,0,8" FontSize="16" Foreground="#FFFFFFFF" x:Name="AccountTxt" Width="109"/>
                    <TextBlock Text="{Binding Mode=OneWay, Path=LastName}" TextWrapping="Wrap" Margin="0,8,0,0" FontSize="16" Foreground="#FFFFFFFF" x:Name="LastName" HorizontalAlignment="Right" Width="109" Grid.Row="1"/>
                    <TextBlock HorizontalAlignment="Left" VerticalAlignment="Top" Text="{Binding Path=PhoneNumber}" TextWrapping="Wrap" x:Name="PhoneTXT" Grid.Row="2" Foreground="#FFFFFFFF" FontSize="16"/>
                    <TextBlock HorizontalAlignment="Left" VerticalAlignment="Stretch" Text="{Binding Path=MemberID}" TextWrapping="Wrap" x:Name="MemID" Grid.Row="3" Margin="0,0,0,8" Visibility="Collapsed"/>
                </Grid>
                <Border CornerRadius="2" BorderBrush="#FFFCF7" Padding="2" BorderThickness="2" x:Name="ImageBorder">
                    <Image Source="{Binding Converter={StaticResource MyConverter}, Path=ImageContent}" />
                </Border>
            </Grid>
        </DataTemplate>

                                  
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Asked On
2009-08-31 at 11:32:51ID24695659
Tags

Visual Studio 2008

,

Silverlight

Topics

WPF and Silverlight

,

Visual Studio

,

Microsoft Visual Basic.Net

Participating Experts
1
Points
250
Comments
4

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Answers

 

by: chinu1310Posted on 2009-08-31 at 17:52:27ID: 25227740

"Items collection must be empty before using itemssource." Where you are assigning the item source to the ListBox ? Looks like it is not getting cleaned up and your are reassigning the Itemsource.

Post some code behind I should be able to help you further.

 

by: ALawrence007Posted on 2009-09-01 at 04:14:30ID: 25230284

chinu1310,

Thanks for taking the time to look at this. Here is the Mainpage code behind:

Public svcContext As New HORHQDBEntities(New Uri("MemBerImageService.svc", UriKind.Relative))
Public WithEvents obsvcollData As ObservableCollection(Of MemberServiceReference.NewMemberImage)
 
Public Sub New()
InitializeComponent()
End Sub
 
Private Sub FetchDataStart()
Try
Dim query As DataServiceQuery(Of MemberServiceReference.NewMemberImage)
query = From c In svcContext.NewMemberImage _
Order By c.AccountNumber
query.BeginExecute(AddressOf InitialDataHandler, query)
Catch ex As Exception
MessageBox.Show(ex.Message, "Error Fetching Data" _
, MessageBoxButton.OK)
End Try
End Sub
 
Private Sub InitialDataHandler(ByVal result As IAsyncResult)
Try
Dim queryResult As DataServiceQuery(Of MemberServiceReference.NewMemberImage)
queryResult = CType(result.AsyncState, DataServiceQuery(Of MemberServiceReference.NewMemberImage))
obsvcollData = New ObservableCollection(Of MemberServiceReference.NewMemberImage)
Dim results As IEnumerable(Of MemberServiceReference.NewMemberImage)
results = Nothing
results = queryResult.EndExecute(result)
For Each r In results
obsvcollData.Add(r)
Next
MemberList.ItemsSource = obsvcollData
MemberList.UpdateLayout()
Catch ex As Exception
MessageBox.Show(ex.Message, "Error Data Handeling" _
, MessageBoxButton.OK)
End Try
End Sub
 
Private Sub MainPage_Loaded(ByVal sender As Object, ByVal e As System.Windows.RoutedEventArgs) Handles Me.Loaded
FetchDataStart()
End Sub

                                              
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by: ALawrence007Posted on 2009-09-03 at 06:42:54ID: 25250544

chinu1310,

Is there maybe another way of displaying the items in a wrap panel like format? This thing is driving me crasy because it is finished, but my Items are not being displayed the way I want it to be. Can I maybe add all items to a canvas? Would a stackPanel work?

Thanks

 

by: ALawrence007Posted on 2009-09-03 at 08:21:28ID: 25251604

I have found my Issue!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

One image is stored in my database as a .gif and not a .Jpeg. While trying to load that image I get a Catastrophic error.

20120131-EE-VQP-002

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