Thomas Krantz
Sep 8, 2009
  2827
(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

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