Hi all,

I am facing some performance issues and am a bit puzzled. I am sure I am missing something and would appreciate any suggestions.
I am using telerik WPF dlls with version 2009.2.0813.35.

The scenario is I am loading around 2000 objects. It takes almost 30 seconds to render. I assume by default it is using the virtualizing panel and looking at the profiler that seems to be the case. 

I am pasting the profiler output here. The problem seems to be the UpdateRowHeight call in the GridViewVirtualizingPanel where it seems to go through all the records even though the UI is virtualized.

61.08 % MeasureOverride - 18728 ms - 0 calls - Telerik.Windows.Controls.GridView.BaseVirtualizingPanel.MeasureOverride(Size)
  61.08 % UpdateRowHeight - 18728 ms - 0 calls - Telerik.Windows.Controls.GridView.GridViewVirtualizingPanel.UpdateRowHeight(IRowItem)
    61.08 % OnRefreshScrollExtent - 18728 ms - 0 calls - Telerik.Windows.Controls.GridView.GridViewVirtualizingPanel.OnRefreshScrollExtent()
      61.08 % RefreshItemsPhysicalHeightsCache - 18728 ms - 0 calls - Telerik.Windows.Controls.GridView.GridView.Scrolling.PhysicalHeightsCache.RefreshItemsPhysicalHeightsCache()
        61.08 % CreateDataRecordsHeightsCache - 18728 ms - 0 calls - Telerik.Windows.Controls.GridView.GridView.Scrolling.PhysicalHeightsCache.CreateDataRecordsHeightsCache(IList<Record>, Double, Int32, Int32)
          61.08 % InsertItem - 18728 ms - 0 calls - Telerik.Windows.Controls.GridView.GridView.Scrolling.RadKeyedCollection<TKey, TItem>.InsertItem(Int32, TItem)
            61.08 % AddKey - 18728 ms - 0 calls - Telerik.Windows.Controls.GridView.GridView.Scrolling.RadKeyedCollection<TKey, TItem>.AddKey(TKey, Int32)
              30.93 % System.Collections.Generic.Dictionary<TKey, TValue>.FindEntry... - 9484 ms - 0 calls
              30.15 % System.Collections.Generic.Dictionary<TKey, TValue>.Insert... - 9245 ms - 0 calls

-------------------------------------------------------------------------------------------------------------------------------

Is this a known thing or am I doing something wrong? The xaml fragment is below:

<telerik:RadGridView Name="OfficerGrid" AutoGenerateColumns="False" IsReadOnly="True"
                                 MultipleSelect="False" ShowGroupPanel="False"
                                 IsFilteringAllowed="False"
                                 SelectionChanged="OnSelectionChanged" DataLoadMode="Asynchronous"
                                 GridLinesVisibility="None"
                                 MouseDoubleClick="OfficerGrid_MouseDoubleClick">
                <telerik:RadGridView.Columns>
                    <telerik:GridViewDataColumn Header="Name" DataMemberBinding="{Binding Path=Name, Mode=OneWay}"/>
                    <telerik:GridViewDataColumn Header="Office" DataMemberBinding="{Binding Path=Office, Mode=OneWay}"/>
                    <telerik:GridViewDataColumn Header="Job Title" DataMemberBinding="{Binding Path=JobTitle, Mode=OneWay}"/>
                </telerik:RadGridView.Columns>
            </telerik:RadGridView>

Thanks for any help,
Kashi

I have a GridView's itemsource bound to a dataset with a table "xyz" as it's DataMember. When I add a new row to a .net listview bound to the same table, the GridView does not display the new row. However, when I click on the filter icon on the first column of the GridView, I can see the new row value. Any ideas?
Rod

I am supporting some Telerik code that has a GridView with 30 columns of GridViewDataColumn type.  As part of the GridView, there is a RadGridView.RowDetailsTemplate that includes a UserControl that is basically an editor of the columns of the GridView. 

Bindings seems to be refreshing the GridView columns just fine when the columns of the GridView are visible to the user.  Since this GridView has about 30 columns, only about 10 columns are visible to the user at any given time.  As user scrolls horizontally, he can see the other columns.   If the columns being edited by the user are not visible at the time of editing, those values are not updated 50% of the time when he scrolls the grid columns into view.   Some columns are being updated correctly and some columns would not be updated correctly.  If the columns are visible at the time of editing, we have not noticed the cells not be updated correctly.
 
To test out our viewmodel, I rewrote part of the grid using the same bindings with a non-Telerik grid, everything seems to refresh just fine as the values are being edited and the gridview being scrolled.

We are using the current Telerik control for WPF 4.

Any suggestions would be appreciated.

Thanks,
Milt

When performing a ShowDialog (and even .Show) of WPF Window within the MouseDoubleClick event of the RadTreeView, mouse events (MouseEnter, Click, etc..) no longer fire in the Dialogue Window.  It gives the appearance of hanging, but keyboard nav functions just fine.

Interestingly, by moving focus to a different window and alt-tabbing back to the dialogue, the mouse events are once again detected.
I have only noticed this in the MouseDoubleClick event. 

The workaround that I am using to avoid this problem is to set a flag in the MouseDoubleClick event and then check the flag in the MouseLeftButtonUp event.    If I fire the .Show or .ShowDialog from the MouseLeftButtonUp event, all is OK and the problem does not appear. 


Details
VS 2010 Ultimate
Telerik - WPF 2011 Q2 - SP1
Win 7 - 64

Reproduce
Create WPF Application with two windows (MainWindow and TestDLG)
Build/Run
Double Click on Item 1
Hit Cancel Button
If it doesn't appear to lock on first try, repeat.  Always get it to lock before doing this three or four times.

When it locks, just Alt-Tab out and then back to the test application and the mouse lives again.

This sample is as simple as I could make.

MainWindow - Code Behind

MainWindow CodeBehind (Workaround)
This is the workaround that allows the ShowDialog to occur on doubleclick event but not lose mouse events.

Dialog Window

Dialog Window CodeBehind

Today I downloaded the WPF demo application (via ClickOnce), and noticed that the sample code does not allow text highlighting or copying to clipboard.  When will this feature be added to the WPF demo application?

I'm having trouble adding a binding to the visibility property of the series definition object programmatically. the binding works fine in xaml, but the object doesn't seem to have a SetBinding() function available to it, only a SetValue() - which doesn't set binding, only the value..

is there another way to do this?

i define a series mapping in XAML but allow users to change the chart type which clears the binding. below is the XAML definition:



And in the C# code-behind i attempt to change the value this way:


there is no SetBinding() function so i'm not sure how i can add the binding alternatively? it can be done perfectly in XAML but not sure about code behind...

Thanks,
Nemanja

Hello.

I have a Rad Tree View with around 2000 root nodes inside a RadTabControl. They are are bound to observable Collection items as I need to Drag and Drop to maintain order.

When I select the tab item containing this Tree View. It takes around 40 seconds to load which as you can understand not acceptable to the end user.

Is there any way to speed it up or what I am missing.

Regards

Ahmad

Hi,

I am facing problem while rebinding the grid.

In the XAML,

<

 

 

telerik:RadGridView x:Name="RadGridView1" ItemsSource="{Binding Path=Table, Mode=TwoWay,
UpdateSourceTrigger=PropertyChanged}" GridLinesVisibility="Both" IsReadOnly="True"

 

 

 

CanUserFreezeColumns="False" RowIndicatorVisibility="Collapsed" CanUserReorderColumns="False"

 

 

 

ShowGroupPanel="False" HorizontalAlignment="Left" SelectionMode="Extended" SelectionUnit="Cell"
BorderThickness="0">

 

<

 

 

telerik:RadGridView.FilterDescriptors>
<telerik:FilterDescriptor Member="ParentID" Operator="IsEqualTo" Value="0"/>
</telerik:RadGridView.FilterDescriptors>

 

 

 

 

 

 

<

 

 

telerik:RadGridView.ChildTableDefinitions>
<telerik:GridViewTableDefinition>
<telerik:GridViewTableDefinition.Relation>
<telerik:TableRelation IsSelfReference="True">
<telerik:TableRelation.FieldNames>
<telerik:FieldDescriptorNamePair ParentFieldDescriptorName="ServiceID" ChildFieldDescriptorName="ParentID"/>
</telerik:TableRelation.FieldNames>
</telerik:TableRelation>
</telerik:GridViewTableDefinition.Relation>
</telerik:GridViewTableDefinition>
</telerik:RadGridView.ChildTableDefinitions>
</telerik:RadGridView>

In the ViewModel,

 

private

 

 

DataTable _table;
public DataTable Table
{
get { return _table; }
set
{
_table = value;
RaisePropertyChanged(() => this.Table);
}
}

 

 

[

 

ImportingConstructor]
public MatrixViewModel(IEventAggregator eventAggregator)
{
this.TabModel = new TabModel { Title = "Matrix" };

if (eventAggregator != null)
eventAggregator.GetEvent<MatrixReloadEvent>().Subscribe(OnContractCreatedOrLoaded);
}

 

 

 

private void OnContractCreatedOrLoaded(ContractCreatedOrLoadedEventArgs args)

 

{

 

DataTable dtOutput = new DataTable();
..buliding the datatable and assigning to the Table property
}

 

 

From the other screen I am calling the event "OnContractCreatedOrLoaded" while adding new items. For the first time (add 1 or n number of items) and view the grid screen. It works perfectly (Grid will have only one row - ParentID = 0).

Now add 1 new item ("OnContractCreatedOrLoaded" event will be fired) and see the grid, it binds all the rows in the datatable without filtering or hierarchy (grid is having all the rows instead of showing ParentID = 0)

Any help appreciated.

Thanks,
Ramasamy

Hi,

how to get the Telerik.Windows.Input namespace? I have already added Telerik.Windows.Controls.dll but i cannot include the Input namesapce.

Thanks,
Ramasamy

Greetings-
I seem to be having a problem with the RadRichTextBox with regard to the MaxWidth and MinWidth properties. We have created a re-usable control callled HTMLEditor.xaml that has the RadRichTextBox contained in a grid. See the code below


This control gets re-used in a few instances and has varying MaxWidth and MinWidth properties in 3 different cases. I seem to having a problem with each instance of the RadRichTextBox control...they do not re-size to the resolution.


Can you provide some help with this?
Thanks,
Strasz