Disposing user control and grid view content

5 posts, 0 answers
  1. Michele
    Michele avatar
    426 posts
    Member since:
    Jun 2009

    Posted 18 Feb 2010 Link to this post

    Hello,
    I wrote a SL application that loads huge data from WCF and display it in a gridview... keeping things simple I've got a main menu with 3 items (0 parameters,1 parameters, 2 parameters) and it shows up some data based on some criteria... On the click of a menu item I do a

    gvContent.Items.Clear()

    but if the user has just loaded the data from another menu item's content, IE/FFox won't free the ~150MB of ram allocated for the gridview.... need I to implement an IDisposable inside the gvContent's usercontrol? how I remove the items of the Gridview?

    Thanks in advance

    p.s. another question.... when I detach an event doing:

      m_clientUtility.GetStoreProcedureFromTipoCompleted -new EventHandler<GetStoreProcedureFromTipoCompletedEventArgs>(m_clientUtility_GetStoreProcedureFromTipoCompleted); 
                m_clientUtility.ExecuteStoreProcedureCompleted -new EventHandler<ExecuteStoreProcedureCompletedEventArgs>(m_clientUtility_ExecuteStoreProcedureCompleted); 

    what happens to the 2 EventHandler created? when are they disposed ??(I've always asked myself)
    Thanks
    Paolo
  2. Pavel Pavlov
    Admin
    Pavel Pavlov avatar
    2039 posts

    Posted 22 Feb 2010 Link to this post

    Hello Paolo,

    Regarding your first question . In general you will not need to do anything additional in order to free memory ( such as implementing IDisposable) . As usually the framework will keep an object in memory as long as there is a reference to it.

    So the next question would be - does RadGridView keep reference to the previous items or something else prevents the GC to flush the memory.

    This can easily be checked - e.g.  try a regular  List box instead of  the RadGridView . If the problem disappears this would mean that RadGridView is to blame for the memory leak.
    In such case please let us know and we will address this immediately.

    Regarding your second question :

    Event handler is delegate  - in other words just something that points to  another object's method.

    The important thing which happens when you use " -=" to detach an event handler is that you break the reference between the two objects - the one raising the event and the one listening for the event.

    Finally when an object remains unreferenced by other objects  it can get  collected by the GC.

    Anyway, again if you  suspect any memory-related problems in your application are caused
    by RadGridView or other controls from our suite - please let us know. ( with some details how to reproduce if possible ) .   Such issues are always addressed with high priority.

    Regards,
    Pavel Pavlov
    the Telerik team

    Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Public Issue Tracking system and vote to affect the priority of the items.
  3. Michele
    Michele avatar
    426 posts
    Member since:
    Jun 2009

    Posted 23 Feb 2010 Link to this post

    Hello Pavel,
    I've checked.... I got the same problem with the ListBox... it's really strange...when I load the UC dinamically it tooks 4mb (not loading any telerik component) then cleaning everything I free 500kb...
  4. Michele
    Michele avatar
    426 posts
    Member since:
    Jun 2009

    Posted 23 Feb 2010 Link to this post

    Hello Pavel,
    sorry to disturb  you again... I thinks I've found something usefull.. I've found a post about finding memory leak by a colleage of yours... I've used windbg and after having done the switch between the usecontrol and cleared it I figured this :

    I've done a !dumpheap -stat -Type Telerik and omitting the small ones... I got

    0ac18cb4        7          336 System.Collections.Generic.Dictionary`2[[System.String, mscorlib],[Telerik.Windows.Controls.Animation.RadAnimation, Telerik.Windows.Controls]]
    0ba51a38        1          344 Telerik.Windows.Controls.RadGridView
    0ac15a90       22          352 Telerik.Windows.ClassHandlersStore
    0ac15694       23          368 Telerik.Windows.RoutedEventHandlerInfoList
    0b53d08c        3          420 Telerik.Windows.RouteItem[]
    0ac19920        7          420 System.Collections.Generic.Dictionary`2+Entry[[System.String, mscorlib],[Telerik.Windows.Controls.Animation.RadAnimation, Telerik.Windows.Controls]][]
    0ac1745c       20          480 System.Collections.Generic.List`1[[Telerik.Windows.RoutedEventHandlerInfo, Telerik.Windows.Controls]]
    0ac12690        4          496 Telerik.Windows.Controls.RadMenuItem
    0ac1d4dc        1          604 System.Collections.Generic.Dictionary`2+Entry[[Telerik.Windows.DependencyObjectType, Telerik.Windows.Controls],[System.Object, mscorlib]][]
    0ac187dc        1          604 System.Collections.Generic.Dictionary`2+Entry[[System.Windows.DependencyProperty, System.Windows],[Telerik.Windows.CoerceValueCallback, Telerik.Windows.Controls]][]
    0ac1a238       41          656 Telerik.Windows.Controls.Office_BlackTheme
    0ac13fc8       29          696 System.Collections.Generic.List`1[[Telerik.Windows.RoutedEvent, Telerik.Windows.Controls]]
    0ac15f44       69          828 Telerik.Windows.DependencyPropertyKey
    0ac153f4       34         1088 Telerik.Windows.CoerceValueCallback
    0ac13b54       56         1120 Telerik.Windows.DependencyObjectType
    0ac15c60       44         1352 Telerik.Windows.RoutedEventHandlerInfo[]
    0ac14a5c        1         1436 System.Collections.Generic.Dictionary`2+Entry[[System.Type, mscorlib],[Telerik.Windows.DependencyObjectType, Telerik.Windows.Controls]][]
    0ac15828       22         1812 Telerik.Windows.ClassHandlers[]
    0ac132e8      115         3220 Telerik.Windows.RoutedEvent
    0ac1559c      530        10600 Telerik.Windows.PropertyMetadata+<>c__DisplayClass1

    I've done a !dumpheap -MT 0ac1559c     
    and got :

    0:031> !dumpheap -MT 0ac1559c 
     Address       MT     Size 
    076f70a8 0ac1559c       20      
    076f7590 0ac1559c       20      
    076f7658 0ac1559c       20      
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    0776b298 0ac1559c       20      
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    0776b3cc 0ac1559c       20      
    0776b51c 0ac1559c       20      
    0776b5dc 0ac1559c       20      
    0776b680 0ac1559c       20      
    0776b724 0ac1559c       20      
    0776b7c8 0ac1559c       20      
    0776b86c 0ac1559c       20      
    0776be7c 0ac1559c       20      
    0776c620 0ac1559c       20      
    0776c6b0 0ac1559c       20      
    0776c740 0ac1559c       20      
    0776c7d4 0ac1559c       20      
    0776c864 0ac1559c       20      
    0776c97c 0ac1559c       20      
    0776ca30 0ac1559c       20      
    0776cae4 0ac1559c       20      
    0776cb74 0ac1559c       20      
    0776cc04 0ac1559c       20      
    0776cc98 0ac1559c       20      
    0776cd54 0ac1559c       20      
    0776cdc8 0ac1559c       20      
    0776ce68 0ac1559c       20      
    0776ceec 0ac1559c       20      
    0776cf70 0ac1559c       20      
    0776cff4 0ac1559c       20      
    0776d078 0ac1559c       20      
    0776d0fc 0ac1559c       20      
    0776d18c 0ac1559c       20      
    0776d21c 0ac1559c       20      
    0776d2c0 0ac1559c       20      
    0776d350 0ac1559c       20      
    0776d3e0 0ac1559c       20      
    0776d454 0ac1559c       20      
    0776d538 0ac1559c       20      
    0776d59c 0ac1559c       20      
    0776d6e8 0ac1559c       20      
    0776d7c8 0ac1559c       20      
    0776d84c 0ac1559c       20      
    0776d8d0 0ac1559c       20      
    0776d954 0ac1559c       20      
    0776da04 0ac1559c       20      
    0776db28 0ac1559c       20      
    0776dc50 0ac1559c       20      
    0776dce0 0ac1559c       20      
    0776dee4 0ac1559c       20      
    0776dfb8 0ac1559c       20      
    0776e03c 0ac1559c       20      
    0776e0c0 0ac1559c       20      
    0776e1d4 0ac1559c       20      
    0776e244 0ac1559c       20      
    0776e3a4 0ac1559c       20      
    0776e458 0ac1559c       20      
    0776e4fc 0ac1559c       20      
    0776e56c 0ac1559c       20      
    0776e7f4 0ac1559c       20      
    0776e8b4 0ac1559c       20      
    0776e938 0ac1559c       20      
    0776e9f4 0ac1559c       20      
    0776f314 0ac1559c       20      
    0776f640 0ac1559c       20      
    07779af4 0ac1559c       20      
    07779b64 0ac1559c       20      
    077879cc 0ac1559c       20      
    07787a80 0ac1559c       20      
    07787b40 0ac1559c       20      
    07787bb8 0ac1559c       20      
    07787c48 0ac1559c       20      
    07787cac 0ac1559c       20      
    07787d4c 0ac1559c       20      
    07788bf8 0ac1559c       20      
    07788d40 0ac1559c       20      
    07788f98 0ac1559c       20      
    07789064 0ac1559c       20      
    077890e0 0ac1559c       20      
    07789144 0ac1559c       20      
    077891b8 0ac1559c       20      
    07789248 0ac1559c       20      
    077892d8 0ac1559c       20      
    0778935c 0ac1559c       20      
    0778952c 0ac1559c       20      
    077895ac 0ac1559c       20      
    0778f750 0ac1559c       20      
    0778f804 0ac1559c       20      
    0778f888 0ac1559c       20      
    0778f90c 0ac1559c       20      
    0778fa60 0ac1559c       20      
    0778faf8 0ac1559c       20      
    07795fb0 0ac1559c       20      
    077960d4 0ac1559c       20      
    07796158 0ac1559c       20      
    07798b14 0ac1559c       20      
    07798bc8 0ac1559c       20      
    07798c4c 0ac1559c       20      
    07798cbc 0ac1559c       20      
    07798d50 0ac1559c       20      
    07798dc0 0ac1559c       20      
    07798e50 0ac1559c       20      
    07798ee0 0ac1559c       20      
    077990d0 0ac1559c       20      
    07799144 0ac1559c       20      
    077991b8 0ac1559c       20      
    0779922c 0ac1559c       20      
    077992a0 0ac1559c       20      
    07799330 0ac1559c       20      
    07799410 0ac1559c       20      
    077994b4 0ac1559c       20      
    0779f184 0ac1559c       20      
    0779f244 0ac1559c       20      
    0779f3c8 0ac1559c       20      
    0779f458 0ac1559c       20      
    0779f694 0ac1559c       20      
    0779f79c 0ac1559c       20      
    0779f818 0ac1559c       20      
    077a724c 0ac1559c       20      
    077b5f58 0ac1559c       20      
    077b600c 0ac1559c       20      
    077b6090 0ac1559c       20      
    077b6104 0ac1559c       20      
    077b6180 0ac1559c       20      
    077b61fc 0ac1559c       20      
    077b627c 0ac1559c       20      
    077b62fc 0ac1559c       20      
    077b637c 0ac1559c       20      
    077b63fc 0ac1559c       20      
    077b649c 0ac1559c       20      
    077b651c 0ac1559c       20      
    077b659c 0ac1559c       20      
    077b663c 0ac1559c       20      
    077b66bc 0ac1559c       20      
    077b6758 0ac1559c       20      
    077b67e8 0ac1559c       20      
    077b684c 0ac1559c       20      
    077b6bac 0ac1559c       20      
    077b6cdc 0ac1559c       20      
    077b74f0 0ac1559c       20      
    077b75e4 0ac1559c       20      
    077b7744 0ac1559c       20      
    077b7810 0ac1559c       20      
    077b788c 0ac1559c       20      
    077b78f0 0ac1559c       20      
    077b7a14 0ac1559c       20      
    077b7a84 0ac1559c       20      
    077b7b04 0ac1559c       20      
    077b81ac 0ac1559c       20      
    077b82a0 0ac1559c       20      
    077b8704 0ac1559c       20      
    077b9740 0ac1559c       20      
    077b97d0 0ac1559c       20      
    077b98bc 0ac1559c       20      
    077b9958 0ac1559c       20      
    077b99dc 0ac1559c       20      
    077b9a74 0ac1559c       20      
    077ba364 0ac1559c       20      
    077ba488 0ac1559c       20      
    077bae94 0ac1559c       20      
    077baf34 0ac1559c       20      
    077bafa4 0ac1559c       20      
    077bb1d0 0ac1559c       20      
    077bb320 0ac1559c       20      
    077c4dec 0ac1559c       20      
    077c5978 0ac1559c       20      
    077c6fb4 0ac1559c       20      
    077c70cc 0ac1559c       20      
    077c7130 0ac1559c       20      
    077c7e7c 0ac1559c       20      
    077c7f10 0ac1559c       20      
    077c7fb4 0ac1559c       20      
    077c8064 0ac1559c       20      
    077c8114 0ac1559c       20      
    077c81f8 0ac1559c       20      
    077c82b8 0ac1559c       20      
    077c8328 0ac1559c       20      
    077c8398 0ac1559c       20      
    077c8408 0ac1559c       20      
    077c8498 0ac1559c       20      
    077c8508 0ac1559c       20      
    077c8614 0ac1559c       20      
    077c86a4 0ac1559c       20      
    077c8734 0ac1559c       20      
    077c8ac0 0ac1559c       20      
    077c8b50 0ac1559c       20      
    077c8bd4 0ac1559c       20      
    077c8c58 0ac1559c       20      
    077c8cdc 0ac1559c       20      
    077c8d4c 0ac1559c       20      
    077c8ddc 0ac1559c       20      
    077c8e94 0ac1559c       20      
    077c8f24 0ac1559c       20      
    077c8ff0 0ac1559c       20      
    077c90c4 0ac1559c       20      
    077c9198 0ac1559c       20      
    077c922c 0ac1559c       20      
    077c92e8 0ac1559c       20      
    077c9860 0ac1559c       20      
    077c9978 0ac1559c       20     

    doing a !gcroot

    0:031> !gcroot 077c9978  
    Note: Roots found on stacks may be false positives. Run "!help gcroot" for 
    more info. 
    Scan Thread 8 OSTHread 13b0 
    Scan Thread 24 OSTHread 124c 
    Scan Thread 25 OSTHread 12d4 
    Scan Thread 28 OSTHread c94 
    Scan Thread 29 OSTHread ea0 
    DOMAIN(0598EDE8):HANDLE(Pinned):9b712f0:Root:  086e64a0(System.Object[])-> 
      077c99ac(System.Windows.CustomDependencyProperty)-> 
      077c998c(System.Windows.PropertyChangedCallback)-> 
      077c9978(Telerik.Windows.PropertyMetadata+<>c__DisplayClass1)-> 
    DOMAIN(0598EDE8):HANDLE(Pinned):9b712f8:Root:  086e4260(System.Object[])-> 
      076e84a8(System.Collections.Generic.List`1[[System.Windows.DependencyProperty, System.Windows]])-> 
      0775c710(System.Object[])-> 
      077c99ac(System.Windows.CustomDependencyProperty)-> 
      077c998c(System.Windows.PropertyChangedCallback)-> 
      077c9978(Telerik.Windows.PropertyMetadata+<>c__DisplayClass1)-> 
     

    As far as I've seen this can a memory leak.... can you confirm? Consider that I've not loaded any item from the GridView, just loaded it and then done a clear...

    My XAML file is :

    <IF:LayoutBase x:Class="IFWebLight.Utility.Dettagli.DataSingola" 
        xmlns:telerikGridView="clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls.GridView"   
        xmlns:grid="clr-namespace:Telerik.Windows.Controls.GridView;assembly=Telerik.Windows.Controls.GridView" 
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"  
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"  
        xmlns:ms="clr-namespace:System.Windows.Controls;assembly=System.Windows" 
        xmlns:data="clr-namespace:Telerik.Windows.Data;assembly=Telerik.Windows.Data" 
        xmlns:telerik="clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls" 
        xmlns:telerikInput="clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls.Input"  
        xmlns:IF="clr-namespace:IFWebLight.Utility.Dettagli" 
        > 
        <Grid x:Name="LayoutRoot" Loaded="LayoutRoot_Loaded" SizeChanged="LayoutRoot_SizeChanged"
           <Grid.RowDefinitions> 
                <RowDefinition Height="25"></RowDefinition> 
                <RowDefinition ></RowDefinition
            </Grid.RowDefinitions> 
     
            <StackPanel Grid.Row="0" Orientation="Horizontal" x:Name="spMain"
                <TextBlock Text="Selezionare Vista" VerticalAlignment="Center" ></TextBlock
                <ComboBox x:Name="cbStore" Margin="5,0,0,0" DisplayMemberPath="Descrizione" MinWidth="120"></ComboBox> 
                <TextBlock  Text="Data Inizio" Width="70" VerticalAlignment="Center" HorizontalAlignment="Left" Margin="5,0,0,0" ></TextBlock
                <telerikInput:RadDatePicker MinWidth="120" x:Name="dpDataInizio" IsTodayHighlighted="True" Height="22" IsEnabled="False" Margin="5,0,0,0"></telerikInput:RadDatePicker> 
     
                <Button x:Name="btnCarica" Margin="5,0,0,0" Content="Carica" Click="Carica_Click"></Button> 
                <Button x:Name="btnExport" Margin="5,0,0,0" Content="Export Xls" Click="btnExport_Click" IsEnabled="False" ></Button
            </StackPanel> 
            <Grid Grid.Row="1" Margin="0,5,0,0" HorizontalAlignment="Stretch" x:Name="gridContent" > 
                 
                <telerikGridView:RadGridView x:Name="gvContent" AutoGenerateColumns="False" DataLoadMode="Asynchronous"
     
                </telerikGridView:RadGridView> 
                
            </Grid>  
         
            <telerik:RadProgressBar Grid.Row="1" x:Name="pb" Width="260" Height="30" Minimum="0" Maximum="1000" Margin="0,0,0,30" IsIndeterminate="True" Visibility="Collapsed" /> 
             
        </Grid> 
    </IF:LayoutBase> 
     

    Hope this helps... Thanks



  5. Stefan Dobrev
    Admin
    Stefan Dobrev avatar
    790 posts

    Posted 01 Mar 2010 Link to this post

    Hi Paolo,

    Thanks for taking the time and profiling our memory usage. What you have found out are static references to dependency property metadata objects that RadGridView is using. This is definitely not a memory leak, because this is the way Silverlight works, it requires you to create static fields in order to have dependency properties.

    All the best,
    Stefan Dobrev
    the Telerik team

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