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How to use group by in LINQ C# and fetch the list of records?

Sandra Emily 703 17 Aug 2023

How to use group by in LINQ C# and fetch the list of records?

c# c#linqgroup by
Updated 18 Aug 2023
Sandra Emily
Sandra Emily

Student

Content writing is the process of writing, editing, and publishing content in a digital format. That content can include blog posts, video or podcast scripts, ebooks or whitepapers, press releases, product category descriptions, landing page or social media copy and more.

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1 Answers

Aryan Kumar
Aryan Kumar 18 Aug 2023
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Sure, I can help you with that.

The GroupBy() method in LINQ is used to group elements in a sequence based on a common property. The GroupBy() method returns a IGrouping<TKey, TResult> object, which is a collection of elements that have the same key.

To use the GroupBy() method, you need to specify the property that you want to group the elements by. You can also specify a lambda expression to customize the grouping.

The following code groups a list of Person objects by their age:

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 groupedPeople = people.GroupBy(p => p.Age);

In this code, the GroupBy() method groups the people list by the Age property of the Person objects. The groupedPeople variable is a IGrouping<int, Person> object, which is a collection of Person objects that have the same age.

To fetch the list of records, you can use the ToList() method. The ToList() method returns a list of all the elements in the IGrouping object.

The following code fetches the list of records from the groupedPeople variable:

C#

var records = groupedPeople.ToList();

In this code, the records variable is a list of all the Person objects in the groupedPeople object.

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