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8.2

Silverlight Listbox ItemsSource Error

Asked by ALawrence007 in WPF and Silverlight, Microsoft Visual Basic.Net, Visual Studio

Tags: Visual Studio 2008, Silverlight

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 
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<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>
[+][-]09/01/09 04:14 AM, ID: 25230284Accepted Solution

Your question has an Asker Certified™ answer! ALawrence007 verified that this solution worked for them--which means it will likely work for you, too. Click to view the solution free for 30-days now.

About this solution

Zones: WPF and Silverlight, Microsoft Visual Basic.Net, Visual Studio
Tags: Visual Studio 2008, Silverlight
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Solution Provided By: ALawrence007
Participating Experts: 1
Solution Grade: A
 
[+][-]08/31/09 05:52 PM, ID: 25227740Assisted Solution

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[+][-]09/03/09 06:42 AM, ID: 25250544Author Comment

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[+][-]09/03/09 08:21 AM, ID: 25251604Author Comment

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