Questions on UI for WPF Forum

9 answers

334 views

Performance issue when adding items to collection

I'm having some really bad performance when adding rows to the grid. I've got the grid items bound to an ObservableCollection. I'm then adding 7000 rows one-by-one to this collection. It basically freezes up for a couple of minutes.

I've done some profiling to try and find out what's holding things up and it seems to be spending about a 1/3 of the time in QueryableCollectionView:ProcessSynchronousCollectionChangedWithAdjustedArgs. Is there a way to set up the grid to avoid this call?

The main problem in that method is that it calls PropertyChangeInfo:GetChangedPropertyNames which compiles a linq expression foreach each propertyAccess. Any suggestions for improving the performance there?

Thanks!

GridView

answered on 06 Aug 2010

8 answers

167 views

Compare the Top Item with Currently Clicked item in RadCarouselPanel

Hi,

I'm new to Telerik Controls. I'm trying to use the carousel controls in Expression Blend 4; having the few questions below

- Unlike the RadCaruosel for WinForm, I couldn't specify the eliptical path for the carousel items in Expression Blend (and VS2010), on WPF. Is that a limitation on this control for WPF currently? If not, how can I set the eliptical path (at design time)
- I've 8 items on the Carousel control (I tried it on Carousel and CarouselPanel), but only 5 are visible at a time. Other three would scroll in when I click the item near to them. Is there a way I can show all the 8 controls on my real estate?

Lastely, How can I compare and identify whether the user clicked on the top most item on the Carousel Panel? For example, out of my 8 items, if the user clicks on the item 6 it would be made as the top item. When the user clicks on it again, I want to identify it and perform some action.

Thanks in advance.
Ela

Carousel

answered on 06 Aug 2010

1 answer

116 views

Error when using the 'GridViewDynamicHyperlinkColumn.CellTemplate

Hello,
I am trying to create an unbounded link on the grid using the

GridViewHyperlinkColumn

and the link is not showing up. Can you please help me with this issue?

Thanks

GridView

answered on 06 Aug 2010

1 answer

110 views

Bogus Routed events on comboboxes

I have and application with a user control that is a font chooser. It is nothing more than a single row of comboboxes. This user control (FontChooser) raises a selectionChangedEvent when any of the comboboxes are changed.
In my parent program I use a foreach loop to create a new FontChooser with a unique name for each item it is associated with (see code). So, for example I have eleven items, each with a FontChooser control fc_A - K.
I have an event hander that handles the SelectionChangedEvent for all of the FontChoosers. When an event is fired I use the e.OrginalSource to capture which FontChooser fc_A -K is being changed ex: FontChooser fc = (e.OriginalSource as FontChooser);. However, no matter which FontChooser is changed the last one added shows up as the OriginalSource. So, If where to write the fc name to the Console with Console.Out.WriteLine( fc.Name); I will get something like fc_K and fc_B, or fc_K and fc_K. The event seems to fire twice and always with the last FontChooser added to the parent app. BTW,I have tried to use e.Source and Sender as FontChooser, all produce the same result. If anyone has any ideas I am all ears.

fontChooser = new FontChooser();

fontChooser.selectedFont = row.ItemArray[3]; //From dataTable

fontChooser.selectedStyle = row.ItemArray[5].ToString().Trim();

fontChooser.selectedSize = row.ItemArray[4];

fontChooser.selectedWeight = FontWeight.FromOpenTypeWeight( Int32.Parse(row.ItemArray[7].ToString()));

fontChooser.Name = "fc_" + row.ItemArray[0].ToString().Trim();

fontChooser.SelectionChanged += new SelectionChangedEventHandler(fontChooser_SelectionChanged);

grid.RegisterName(fontChooser.Name, fontChooser);

grid.Children.Add(fontChooser);

Grid.SetRow(fontChooser, i);

Grid.SetColumn(fontChooser, 3);

Grid.SetColumnSpan(fontChooser, 4);

//Event Handler

void fontChooser_SelectionChanged(object sender, SelectionChangedEventArgs e)

{

FontChooser fc = (e.OriginalSource as FontChooser);

selectedFont = fc.selectedFont;

selectedFontStyle = fc.selectedStyle;

FontWeight weight = (FontWeight)fc.selectedWeight;

selectedFontWeight = weight;

Console.Out.WriteLine(fc.Name); //Added to see what is going wrong

string name = fc.Name.Substring(3);

activeControl = name;

string filterExpr = "LABEL_NAME = '" + name + "'";

DataRow[] rowToUpdate = tempTable.Select(filterExpr);

int ptr = tempTable.Rows.IndexOf(rowToUpdate[0]);

DataRow dr = rowToUpdate[0];

dr[3] = selectedFont;

if (fc.selectedSize != null)

{

selectedFontSize = fc.selectedSize;

dr[4] = selectedFontSize;

}

dr[5] = selectedFontStyle;

dr[7] = weight.ToOpenTypeWeight();

dr.AcceptChanges();

tempTable.Rows[ptr].BeginEdit();

tempTable.Rows[ptr].ItemArray = dr.ItemArray;

tempTable.Rows[ptr].AcceptChanges();

tempTable.Rows[ptr].EndEdit();

}

General Discussions

answered on 05 Aug 2010

2 answers

111 views

TopItem Clicked event for RadCarousel

Hi,

The SelectionChanged event of RadCarousel works only when the Non-Top item is selected. Is there a event/way to know when the user clicks on the Top item? Currently I'm using the DoubleClicked event to check for the Top item's property, to identify it. But, I want to know whether I can handle it with a single click.

Thanks in advance.
Ela

Carousel

answered on 05 Aug 2010

4 answers

110 views

[Solved] AutoGenerateHierarchy property in latest version?

I have the 2010.2.714.40 demo package and the RadGridView does not have the AutoGenerateHierarchy property.
I am trying to follow this post: http://blogs.telerik.com/RobertShoemate/Posts/09-12-30/techniques_for_creating_a_hierarchical_radgridview_for_winforms.aspx
to reproduce this functionality in a WPF Application.
Thank you.

GridView

answered on 05 Aug 2010

3 answers

644 views

GridViewDataColumn DataFormatString leading zero

Hi,

May I know how to set the data format for a numeric field like ID with leading zeroes in the gridview? I tried using DataFormatString="{}{0:00000000}" but did not worked.

How can I also format decimal numbers to display with comma and two decimal numbers? For example 2350.2 would be displayed as 2,350.20

Thanks..

GridView

answered on 05 Aug 2010

1 answer

120 views

embbed controls in the different cells of a grid

Hi,

How can I insert controls (like textbox, combobox...e.t.c) in the gridview. As I need to embbed controls in the different cells of a grid.

Thanks,
-Narendra

GridView

answered on 05 Aug 2010

5 answers

148 views

WCF Service as Tile Source

Hello all,
I want to use a WCF Service as Tile Source.
As far as I have seen I can only use the GetTile() method to influence the tile request.
This way I can only change URIs.
Is or will there be any way to have an overidable method which returns image data so that I can fetch the images from my WCF Service?

This is a major point in our decision whether to buy the Telerik components.

Map

answered on 05 Aug 2010

1 answer

227 views

Problem with a Listbox inside a RadExpander

Hi, I use a ListBox inside a RadExpander.

When I use the button a the center of my mouse to mode the scrollbar of the scrollviewer, it doesn't work
when I am into the Listbox. It works well, only when I am outside the ListBox.

Do you have this problem also and do you have a solution ?

Thank you in advance,

Expander

answered on 05 Aug 2010