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How to use multiple "order by" in LINQ?

Sandra Emily 393 17 Aug 2023

How to use multiple "order by" in LINQ?

c# c#linq
Updated 18 Aug 2023
Sandra Emily
Sandra Emily

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1 Answers

Aryan Kumar
Aryan Kumar 18 Aug 2023
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To use multiple OrderBy() in LINQ, you can use the ThenBy() method. The ThenBy() method takes a lambda expression as its parameter and sorts the list by the property specified by the lambda expression. The following code sorts a list of Person objects by their age in ascending order, and then by their name in descending order:

C#

var people = new List<Person>();
people.Add(new Person { Age = 20, Name = "John" });
people.Add(new Person { Age = 30, Name = "Jane" });
people.Add(new Person { Age = 10, Name = "Peter" });

var sortedPeople = people.OrderBy(p => p.Age).ThenBy(p => p.Name);

In this code, the OrderBy() method sorts the list by the Age property of the Person objects in ascending order. The ThenBy() method then sorts the list by the Name property of the Person objects in descending order.

You can also use the ThenByDescending() method to sort the list by the property specified by the lambda expression in descending order. The following code is equivalent to the previous code:

C#

var sortedPeople = people.OrderBy(p => p.Age).ThenByDescending(p => p.Name);
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