Limit Number of Results being returned in a List from Linq

C#asp.net Mvc-3LinqEntity Framework

C# Problem Overview


I'm using Linq/EF4.1 to pull some results from a database and would like to limit the results to the (X) most recent results. Where X is a number set by the user.

Is there a way to do this?

I'm currently passing them back as a List if this will help with limiting the result set. While I can limit this by looping until I hit X I'd just assume not pass the extra data around.

Just in case it is relevant... C# MVC3 project running from a SQL Server database.

C# Solutions


Solution 1 - C#

Use the Take function

int numberOfrecords=10; // read from user
listOfItems.OrderByDescending(x => x.CreatedDate).Take(numberOfrecords)

Assuming listOfItems is List of your entity objects and CreatedDate is a field which has the date created value (used here to do the Order by descending to get recent items).

> Take() Function returns a specified number of contiguous elements from the start of a > sequence.

http://msdn.microsoft.com/en-us/library/bb503062.aspx

Solution 2 - C#

results = results.OrderByDescending(x=>x.Date).Take(10);

The OrderByDescending(...) will sort items by your date/time property (or w/e logic you want to use to get most recent) and Take(...) will limit to first x items (first being most recent, thanks to the ordering).

Edit: To return some rows not starting at the first row, use Skip():

results = results.OrderByDescending(x=>x.Date).Skip(50).Take(10);

Solution 3 - C#

Use Take(), before converting to a List. This way EF can optimize the query it creates and only return the data you need.

Attributions

All content for this solution is sourced from the original question on Stackoverflow.

The content on this page is licensed under the Attribution-ShareAlike 4.0 International (CC BY-SA 4.0) license.

Content TypeOriginal AuthorOriginal Content on Stackoverflow
QuestionJaredView Question on Stackoverflow
Solution 1 - C#ShyjuView Answer on Stackoverflow
Solution 2 - C#Mr. TAView Answer on Stackoverflow
Solution 3 - C#D'Arcy RittichView Answer on Stackoverflow