Silverlight DataTemplate - Leak Memory

[Nelson]

Hi there,

In my silverlight application, I use a lot of gridViews and DataForms with DataTemplates, like this example:

<telerik:RadGridView x:Name="grdMensagens" Margin="0 5 0 0" Visibility="{Binding Path=DataContext.VerGridAssuntosReuniao,ElementName=LayoutRoot}"
                                    ItemsSource="{Binding Path=DataContext.OCAssuntosReuniao,ElementName=LayoutRoot}"
                                    SelectedItem="{Binding Path=DataContext.AssuntoSeleccionado,Mode=TwoWay,ElementName=LayoutRoot}"
                                    BorderThickness="0"
                                    Width="Auto" Height="330" MaxHeight="335" Grid.ColumnSpan="3" RowHeight="15"
                                    AutoGenerateColumns="False"  IsReadOnly="True"
                                    ShowGroupPanel="False" ShowColumnFooters="False" RowIndicatorVisibility="Collapsed"
                                    LoadingRowDetails="grdMensagens_LoadingRowDetails"
                                    Cursor="Hand">
                                    <swi:Interaction.Triggers>
                                        <swi:EventTrigger EventName="Loaded">
                                            <esi:CallDataMethod Method="grdAssuntos_Loaded"/>
                                        </swi:EventTrigger>
                                    </swi:Interaction.Triggers>
                                    <telerik:RadGridView.Columns>

                                        <telerik:GridViewDataColumn Header="Assunto" Width="0.9*">
                                            <telerik:GridViewDataColumn.CellTemplate>                                                
                                                <DataTemplate>
                                                    <StackPanel>
                                                        <telerikHtml:HtmlDataProvider x:Name="HtmlProvider" RichTextBox="{Binding ElementName=LeitorTemplateNotif}" Html="{Binding ConteudoProp}"/>
                                                        <telerik:RadRichTextBox Height="Auto" HorizontalAlignment="Stretch" Margin="0" FontFamily="Arial" FontSize="10" BorderBrush="Transparent" BorderThickness="0" Background="Transparent" IsImageMiniToolBarEnabled="False" Name="LeitorTemplateNotif" IsReadOnly="True" Visibility="Visible" telerik:StyleManager.Theme="{Binding Path=DataContext.Tema, ElementName=LayoutRoot}" Loaded="ProcessadorTextoSGA_Loaded"/>
                                                    </StackPanel>
                                                </DataTemplate>
                                            </telerik:GridViewDataColumn.CellTemplate>
                                        </telerik:GridViewDataColumn>
                                        <telerik:GridViewDataColumn Header="Anexos" Width="0.1*">
                                            <telerik:GridViewColumn.CellStyle>
                                                <Style TargetType="telerik:GridViewCell">
                                                    <Setter Property="Template">
                                                        <Setter.Value>
                                                            <ControlTemplate TargetType="telerik:GridViewCell">
                                                                <StackPanel Orientation="Horizontal" HorizontalAlignment="Center">
                                                                    <Button Margin="1" Height="25" Width="25" Foreground="#FFFFFFFF" HorizontalAlignment="Center" VerticalAlignment="Center" Command="{Binding Path=DataContext.CmdVerAnexos,ElementName=LayoutRoot}" CommandParameter="{Binding IdProp}" Style="{StaticResource GlassButton}" ToolTipService.ToolTip="Clique para ver os detalhes do documento">
                                                                            <StackPanel HorizontalAlignment="Left" Width="Auto" Height="Auto" Orientation="Horizontal">
                                                                            <Image Grid.Column="0" HorizontalAlignment="Stretch" Source="{Binding Icone}" Height="20" Width="20" Stretch="Fill"/>
                                                                            </StackPanel>
                                                                        </Button>
                                                                </StackPanel>
                                                            </ControlTemplate>
                                                        </Setter.Value>
                                                    </Setter>
                                                </Style>
                                            </telerik:GridViewColumn.CellStyle>
                                        </telerik:GridViewDataColumn>
                                    </telerik:RadGridView.Columns>
                                </telerik:RadGridView>
                            </StackPanel>
                        </telerik:RadTabItem.Content>
                    </telerik:RadTabItem>

And my application have a lot of leaks of memory, if I let the application running for 1 hour the memory used by my application goes unitl 1GB!!!! This is a lot for one simple web application!!!

So I decide investigate and read that DataTemplates are not collected by GC.

So, what is the solution? This is very important. I also read that this behaviour doesn´t occure in Silverlight 3...

Please, i need help here.

Thanks in advance.

Nelson Silva

[Nedyalko Nikolov]

Hi Nelson,

This problem is fixed with Silverlight 4 (4.0.50826.0) release.
Please take a look at this link for more info.

Best wishes,
Nedyalko Nikolov
the Telerik team

[Nelson]

Hi Nedyalko,

I'm using this version of silverlight, but the problem still exists. Another question...and about commanding? I use a lot of commands inside a DataTemplate, I read about it, and seems that command inside templates are not collected by garbage collector? This is true? and if yes, how fix?


Thanks,

Nelson Silva