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Ordering data in LINQ queries by more than one column
Description In this post I am going to show how to do ordering when you require to order data by using multiple columns.   No. of Views     1436
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Author Pranay Rana   Posted On     19 Aug 2011
Tags C#,LINQ,LINQ to Object    

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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 thinks that will do the ordering in multiple columns.

 

IEnumerable 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.
 

 

IEnumerable 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:

 

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.

 

About Author

About Author Hey, I am Pranay Rana, working as a Senior Software engineer. Web development in Asp.Net with C# and MS sql server are the experience tools that I have had for the past 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 me on my blog - http://pranayamr.blogspot.com/
Pranay Rana
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Country India
Company GMind Solutions
Home Page http://pranayamr.blogspot.com/

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