GridViewComboBoxColumn perormance, makes scrolling impossible

[Josip]

Hi,
When i bind 3000 records in RadGrid (only one column) GridViewComboBoxColumn
i got terrible performance.

I need to do this from code behind.

to reproduce problem make WPF in Browser application, and add this page

<Page x:Class="Bug_Demo_ComboBoxColumn_Scroll.Page1"       xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"       xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"       xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"        xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"        xmlns:telerikGrid="clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls.GridView"       mc:Ignorable="d"        d:DesignHeight="300" d:DesignWidth="300"       Title="Page1">     <Grid>         <telerik:RadGridView              Name="dgDynGrid"                        AutoGenerateColumns="False"                            EnableColumnVirtualization="True"             EnableRowVirtualization="True"                         ShowGroupPanel="False"             IsFilteringAllowed="False"             DataLoadMode="Asynchronous"               CanUserInsertRows="True"                          CanUserResizeColumns="False"             CanUserFreezeColumns="False"             RowIndicatorVisibility="Collapsed"               />          </Grid> </Page>

Then make two classes:

    public class Persons     {         public int Id { get; set; }         public string Name { get; set; }         public string PlaceId { get; set; }     }

    public class Place     {         public int PlaceId { get; set; }         public string PlaceName { get; set; }     }

in constructor of "Page1" fill test data:

List<Place> places = new List<Place>();             for (int i = 0; i < 3000; i++)             {                 Place p = new Place();                 p.PlaceId = i;                 p.PlaceName = "PlaceWithID" + i.ToString();                 places.Add(p);             }             List<Persons> persons = new List<Persons>();             for (int i = 0; i < 3000; i++)             {                 Persons p = new Persons();                 p.Id = i;                 p.PlaceId = i.ToString();                 persons.Add(p);             }

Add column:

Telerik.Windows.Controls.GridViewComboBoxColumn column = new Telerik.Windows.Controls.GridViewComboBoxColumn();             column.DataMemberBinding = new Binding("PlaceId");             column.DisplayMemberPath = "PlaceName";             column.SelectedValueMemberPath = "PlaceId";             column.ItemsSource = places;             dgDynGrid.Columns.Add(column);             dgDynGrid.ItemsSource = persons;

is it possible to turn on virtualization in GridViewComboBoxColumn ?

[Josip]

Hi,

Just wanted to send feedback.
I finally managed to put this to work fast :) hope it will help somebody

i replaced GridViewComboBoxColumn with RadComboBox (template in GridViewDataColumn )

 
Binding propertyBinding = new Binding("MyPropertyNameHere);                             
FrameworkElementFactory comboFactory = new FrameworkElementFactory(typeof(RadComboBox)); 
comboFactory.SetBinding(RadComboBox.SelectedValueProperty, propertyBinding); 
comboFactory.SetValue(RadComboBox.IsReadOnlyProperty, false);
comboFactory.SetValue(RadComboBox.IsEnabledProperty, true);
//THIS WAS PERFORMANCE BOOST
comboFactory.SetValue(RadComboBox.ItemsPanelProperty, (ItemsPanelTemplate)Resources["VirtualizingStackPanelTemplate"]); 


//TURN OFF virtualization on grid (if it contains this column type)
dgDynGrid.EnableRowVirtualization = false;                             
dgDynGrid.EnableColumnVirtualization = false;       

 column.IsGroupable = false;                             column.IsAutoGenerated = false;                             column.IsReadOnly = true;                             column.IsEnabled = false;                                                   comboFactory.SetValue(RadComboBox.SelectedValuePathProperty, "Key");                             comboFactory.SetValue(RadComboBox.DisplayMemberPathProperty, "Value");                             comboFactory.SetValue(RadComboBox.ItemsSourceProperty, GetItemSourceForColumn(kolonaEntiteta.ItemSource, kolonaEntiteta.ItemSourceKey, kolonaEntiteta.ItemSourceValue));                             DataTemplate template = new DataTemplate();                             template.VisualTree = comboFactory;                             template.Seal();                             column.CellTemplate = template;
                      

[Pavel Pavlov]

Hello Josip,

Thank you for sharing the workaround! Indeed this will be useful for the community. This is a valuable contribution . I am updating your Telerik points.

Greetings,
Pavel Pavlov
the Telerik team