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Posted 26 Jul 2011

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Ordering Data in LINQ Queries by More Than One Column

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4.93/5 (12 votes)
9 Aug 2011CPOL
How to do ordering when you require to order data by using multiple columns

In this post, I am going to show how to do ordering when you require to order data by using multiple columns.

By using .Orderby(x=>x.Columnname) in a LINQ query, we can easily order data in a source collection. Most new developers make use of the same function twice .Orderby(x=>x.Columnname).Orderby(x=>x.Columnname) and think that will do the ordering in multiple columns.

C#
IEnumerable<Employee> emp = dc.Employees
                                 .OrderBy(x => x.Name)
                                 .OrderBy(x => x.Desc);

But it always does the order by the column you specified in the last OrderBy() method.

Following are two solutions to achieve:

Solution 1

Always make use of ThenBy() after OrderBy() because OrderBy() returns an IOrderedEnumerable which then exposes the methods ThenBy() and ThenByDescending(). This means that we can OrderBy on multiple fields by chaining OrderBy() and ThenBy() together.

C#
IEnumerable<Employee> emp = dc.Employees
                                  .OrderByx => x.Name)
                                  .ThenBy((x => x.Desc); 

Solution 2

If you don't want to go for Lambda expression, you can easily achieve multiple ordering:

C#
var emp = from e in dc.Employees
          orderby e.Name, e.Desc
          select e;

As you can see, in the above statement, after order by, you can add multiple columns and do the ordering on the multiple columns.

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Pranay Rana
Software Developer (Senior)
India India

Microsoft C# MVP (12-13)



Hey, I am Pranay Rana, working as a Team Leadin MNC. Web development in Asp.Net with C# and MS sql server are the experience tools that I have had for the past 5.5 years now.

For me def. of programming is : Programming is something that you do once and that get used by multiple for many years

You can visit my blog


StackOverFlow - http://stackoverflow.com/users/314488/pranay
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Comments and Discussions

 
QuestionGreat Pin
Peter Gallagher23-Sep-13 3:54
MemberPeter Gallagher23-Sep-13 3:54 
GeneralMy vote of 5 Pin
Patrick Harris25-Jul-12 2:22
MemberPatrick Harris25-Jul-12 2:22 
SuggestionMy vote of 4 Pin
Reiss9-Aug-11 2:54
professionalReiss9-Aug-11 2:54 
QuestionError in code Pin
Richard Deeming2-Aug-11 6:09
mveRichard Deeming2-Aug-11 6:09 
AnswerRe: Error in code Pin
Pranay Rana2-Aug-11 19:08
professionalPranay Rana2-Aug-11 19:08 
GeneralRe: Error in code Pin
KenBonny9-Aug-11 0:10
MemberKenBonny9-Aug-11 0:10 

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