Improving Microsoft DataGrid CTP sorting performance

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send flowers » Improving Microsoft DataGrid CTP sorting performance — Wed, 27 Aug 2008 05:55:59 GMT

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re: Improving Microsoft DataGrid CTP sorting performance

sich — Wed, 27 Aug 2008 16:00:28 GMT

This example could be even several times faster if the switch construction was put in the constructor, and sorting code was stored as delegate, as the sorting column is never changed in comparer instance after it's creation :)

More DataGrid Samples: Custom Sorting, Drag and Drop of rows, Column Selection, and Single-click Editing

Vincent Sibal's Blog — Wed, 27 Aug 2008 16:52:20 GMT

Jossef just wrote this great post on improving sorting in the DataGrid through a custom sort. Check it

re: Improving Microsoft DataGrid CTP sorting performance

sich — Wed, 27 Aug 2008 17:01:21 GMT

I have already checked, great article :)

Improving Microsoft DataGrid CTP sorting performance - Part 2

WPF Performance — Fri, 29 Aug 2008 01:05:00 GMT

In this blog I wrote how you can improve Microsoft DataGrid CTP by providing your own custom sort.  

re: Improving Microsoft DataGrid CTP sorting performance

jgoldb — Fri, 29 Aug 2008 07:57:32 GMT

Hi Sich

I updated my sample and, now I am using delegate and I am seeing additional 50% gain.

See:

http://blogs.msdn.com/jgoldb/archive/2008/08/28/improving-microsoft-datagrid-ctp-sorting-performance-part-2.aspx

Possible issue with sorting when string values are null

Kirkaiya — Mon, 15 Sep 2008 11:05:55 GMT

First, thanks for the great coding example - I ended up using your method on a WPF ListView control, which made actually usable (my app has ~ 20,000 rows).

I did have one issue, where the string properties of some items in the ObservableCollection(Of T) were null (or Nothing, in my case, since I ported it to VB.Net). The data was coming from a Linq query.

The way I solved this was to concatenate the value with an empty string (in the mySort switch/Select list), like this:

Case "FirstName"

myCompare = Function(a, b) (a.FirstName & "").ToString.CompareTo((b.FirstName & "").ToString) * dir

I ran your original C# code, adding some items with null values, and it has the same problem, so not just a language issue. Many thanks :-)

re: Improving Microsoft DataGrid CTP sorting performance

khataev — Wed, 15 Apr 2009 12:16:23 GMT

Could you explain why we need to invoke StandardSortingDone this way?

Dispatcher.BeginInvoke(DispatcherPriority.Normal, new NoArgDelegate(StandardSortingDone));

I see that estimated time is being counted wrong if not to use dispatcher's begininvoke method, but cannot understand it -)

re: Improving Microsoft DataGrid CTP sorting performance

khataev — Wed, 15 Apr 2009 14:34:19 GMT

And I'd appreciate if You explain why the second way gives additional gain? Is it by avoiding extra "case" conditions checks?