I am using VirtualQueryableCollectionView with RadGridView and at the same time multiselection mode.

It was already discussed previously with no real solution as far as I know.

When select all (Ctrl+A) is called, all items are loaded into memory which defeats the virtualization and is useless.

So what are the possibilities to fix it?

• Use single selection mode, which is not a solution.
• Use indexes instead of items.
• Use item identifiers if available instead of items.
• Use proxied item objects with knowledge of loaded state and internally loadable when required, which is quite complex.
• Limit ​maximum number of selected items to reasonable value (LoadSize) and add selection events based on indices.

Just my thoughts. I think I will take the last way... and You?

Marek Ištvánek

While using RadGridView with VirtualQueryableCollectionView and moving CurrentPosition with any of MoveCurrent* methods, I have found, that CurrentItem is not loaded when CurrentPosition changes to an index of not yet loaded item (in my case LoadSize is 50 and items are loaded from our WCF service) and thus CurrentItem is null.
The problem is in QueryableCollectionView.InternalGetItemAt where

ignores items loading.

My fix for now is:

It has a drawback that OnCurrentChanged is called twice when this fix is effective.

Hello,

I'm currently applying the office2013 theme to a project and I'm having some strange/unexpected issues. ​I have copied the Telerik.Windows.Themes.Office2013.dll file to a project folder.

 Here is the relevant code of the App.xaml file:

1. I wanted to reduce the font sizes because they are too large for my taste. It was no problem to set new sizes for the fonts, but the controls have a MinHeight value that prevents that the control adapts to the new size so that there is no space gain. Therefore I have defined in the ResourceDictionary that all relevant controls should have a MinHeight of 0. Why do the controls have such a large default MinHeight?
2. As soon as I add "component/Themes/Telerik.Windows.Controls.Docking.xaml" I will get an exception. I don't know if I need it, but most examples I have seen are also using that line. They are also using the RibbonView.xaml line, which also causes an exception on my program.
3. The style definition for Label throws an exception if I use: BasedOn="{StaticResource LabelStyle}". Is this normal? Didn't expect it because I don't have any issues with the TextBox style definition.
4. The most strange issue I'm having comes from the filter popup window of the RadGridView (see attached image). As you can see the window sometimes does not close automatically. And one of the popup windows uses the wrong ComboBox. It's always on the same column but it is ok as soon as I remove the RadComboBox style definition from above. 
5. How can I change the Filter-Symbol color from the column header when filtering is active. I would like to have a color that is more visible (yellor or red)?

Greetings

Raul

Note that there are two values to be bound to. Sorry for my stupidity and i can't come up a way to do that according to the way stated in that article.      

Jingfei

Hi team,

We know that we need to leverage the UI Virtualization of RadGridView to improve its performance. But sometimes I still suffer some big latency, so I would want to know which part of is to be blamed. One of ways i know is shown below.

The elapsed milliseconds logged here is usually no more than 3000, but sometimes, I feel like it's taking 6~9 se​conds to ​display the final GridView. So i want to know deeper insights of where and when the GridView spend time on

 Thanks,

-J

Hi,
i have sortabletelrik grid with 10 columns.By default telerik provides sorting option.

i need to customize the sorting facility,i mean ,say i have these two columns with colums1 and columns2. when i click on column header column1,it should not sort.This can be done by setting isortable=false in XAML.But my problem is,wen i click on column2 for sorting,it takes up the first column data for sorting which should not happen. The data of column1 should be freezed wen ever i click on sort on any column header of the grid,it has to exclude coulmn1 and den sort.

Please see the required output in the example.

Ex  before sort
column1  column2
A1           Oligo 1
C1           Oligo 2
F1           Oligo 3
A2           Oligo 4
B2           Oligo 5

After sort

column1  column2
A1           Oligo 5
C1           Oligo 4
F1           Oligo 3
A2           Oligo 2
B2           Oligo 1

and one more condition is, this freezing should only happen wen sorting is clicked,not by default. Please reply ASAP. 

Hi Team,

I am new to the  Telerik WPF Controls, My requirement is to create a custom header. Which contains 2 header rows one is the default header row and other one is a dropdown header row. Which is the units row of first row columns​, ​all the details we will get it dynamically and also some times the 2nd row exist and some times it does not based on the condition. Can you please provide a sample it. 

Hi,

 I posted a sample project here to illustrate issue.

 I use a prism project to navigate between view (I don't think that issue is related to prism and think can be reproduce with tabcontrol for sample). I have one page with one RadGridView and one fake page. In the attached project if you navigate to the gridview page, expand some row and return to the fake page so when you go back to the grid all rows are collapsed and expanded state was not preserved.

After investigation it's appear that if I set the DataContext of ViewGrid control in its constructor all works like desire, rows expanded are preserve. For sample replacing ctor "public ViewGrid()  {  InitializeComponent(); }" by "public ViewGrid(Model m) { InitializeComponent(); this.DataContext = m; }" works fine.

Unfortunatly I can not do that and viewmodel is created in the MainWindow.

How can I preserve the rowdetail state ?

 Thanks

Luc
       

hi

 in my application (application is developed using WPF c#) data is loading asynchronously to the radgridview when user clicks on refresh button. i used telerik DelegateCommand to handle the button event. and i just want to cancel the request before data is load to the grid. my UI is look like as follows (attached the screen shot.)

thank you.

Hi,

I am trying to extend the PropertyGridColumnResizer and restrict the dragging of column resizer to a minimum value.

Now i dont see anyway to unregister the dragevent registered for thumb control.

Can you please let me know is there a way to do it.

Thanks.