This is a migrated thread and some comments may be shown as answers.

Hangs when resizing while bottom row is in-view.

3 Answers 204 Views

GridView

This is a migrated thread and some comments may be shown as answers.

Graeme asked on 07 Feb 2012, 10:39 PM

I've been tracking down a performance problem, and I have it trimmed down to a sample application. For code I am using, see below.

Edit: This also repros in the "RadControls for WPF Q3 2011 SP1 Demos" package, using the "Scrolling 1 Billion Cells" example.

A) Scroll to the bottom of the RadGridView, so that the bottom-most row is in-view.
B) Attempt to resize the window.

At this point my entire OS hangs. I am able to regain control of the OS by CTRL-ALT-DEL then cancelling. At this point I can break the debugger and determine the code is within GridViewCellsPanel.MeasureCell (bottom of stack is GridViewDataControl.MeasureOverride).

I suspect the RadGridView is de-virtualizing when this happens, as the performance gets worse with more records. While this is happening, I can watch in Task Manager that the CPU usage is pegging and the memory usage goes from about 50MB to about 600MB.

Any suggestions? This will be a blocker since we do not experience this behavior in WPF's native DataGrid.

Thanks -
- Graeme

XAML:

<telerik:RadGridView ItemsSource="{Binding}" />

Sample class used:

public class Junk

{

public int Prop0 { get; set; }

public int Prop1 { get; set; }

public int Prop2 { get; set; }

public int Prop3 { get; set; }

public int Prop4 { get; set; }

public int Prop5 { get; set; }

public int Prop6 { get; set; }

public int Prop7 { get; set; }

public int Prop8 { get; set; }

public int Prop9 { get; set; }

public int Prop10 { get; set; }

public int Prop11 { get; set; }

}

Loaded Event Handler:

private void Window_Loaded(object sender, RoutedEventArgs e)

{

Random random = new Random();

List<Junk> list = new List<Junk>();

for (int index = 0; index < 50000; ++index)

{

list.Add(new Junk()

{

Prop0 = random.Next(),

Prop1 = random.Next(),

Prop2 = random.Next(),

Prop3 = random.Next(),

Prop4 = random.Next(),

Prop5 = random.Next(),

Prop6 = random.Next(),

Prop7 = random.Next(),

Prop8 = random.Next(),

Prop9 = random.Next(),

Prop10 = random.Next(),

Prop11 = random.Next(),

});

}

DataContext = list;

}

3 Answers, 1 is accepted

answered on 08 Feb 2012, 10:50 PM

Thanks. I'm attempting to identify a workaround, since this renders the control unusable.

Question to other users: Do you not encounter this blocking issue? Typically I would assume that I am implementing incorrectly, if it were not for the fact that all the demos also exhibit this behavior. (e.g. http://demos.telerik.com/silverlight/#GridView/Performance, installed
"WPF Demos" application). Since this is such a blocking issue, I am surprised to find almost no chatter about it.

Any help is appreciated.

Thanks -
- Graeme

Accepted