Thomas Krantz
Sep 8, 2009
  2763
(0 votes)

Filter and sort pages in as few lines as possible

An example of a couple of useful lambda expressions. At least I think so. These lines are used on a typical A-Z index page, and use a HTTP parameter (line 2) to filter the pages. On line 3 it uses a gorgious lambda to sort by page name.

Can it be done shorter or more beautiful, I wonder? :)

 
   1:  List<PageData> pages = new List<PageData>(GetChildren(CurrentPage.PageLink));
   2:  pages.RemoveAll(page => !page.PageName.ToUpper().StartsWith(Request["c"].ToUpper()));
   3:  pages.Sort((p1, p2) => p1.PageName.CompareTo(p2.PageName));
   4:   
   5:  // plDictionary is a PageList. Contains all pages with a page name starting with 
   6:  // the string Request["c"].
   7:  plDictionary.DataSource = pages;
   8:  plDictionary.DataBind();
Sep 08, 2009

Comments

Sep 21, 2010 10:32 AM

plDictionary.DataSource = GetChildren(CurrentPage.PageLink)
.AsEnumerable()
.Where(pd => string.Compare(pd.PageName, Request["c"], true) == 0)
.OrderBy(pd => pd.PageName);

/ Aanund Austrheim

Aanund Austrheim
Aanund Austrheim Sep 21, 2010 10:32 AM

Woops, wrong Where clause, just wrote it like I usually do:P Just switch it.

Thomas Krantz
Thomas Krantz Sep 21, 2010 10:32 AM

Yes, that was undoubtedly awesome :)

Magnus Rahl
Magnus Rahl Sep 21, 2010 10:32 AM

Extensions + lambda rocks!

Sep 21, 2010 10:32 AM

Great stuff! Straight into the favourites :)
/ Martin Söderlund

Please login to comment.
Latest blogs
Content Delivery API – The Case of the Duplicate API Refresh Token

Creating a custom refresh provider to resolve the issues with duplicate tokens in the DXC The post Content Delivery API – The Case of the Duplicate...

David Lewis | Sep 29, 2022 | Syndicated blog

New Optimizely certifications - register for beta testing before November 1st

In January 2023, Optimizely is making updates to the current versions of our certification exams to make sure that each exam covers the necessary...

Jamilia Buzurukova | Sep 28, 2022

Optimizely community meetup - Sept 29 (virtual + Melbourne)

Super excited to be presenting this Thursday the 29th of September at the Optimizely community meetup. For the full details and RSVP's see the...

Ynze | Sep 27, 2022 | Syndicated blog

Preview multiple Visitor Groups directly while browsing your Optimizely site

Visitor groups are great - it's an easy way to add personalization towards market segments to your site. But it does come with it's own set of...

Allan Thraen | Sep 26, 2022 | Syndicated blog