Group by Operator in C#

Use the group by the operator in C# to separate the results of an expression into parts.

Let’s say the following is our array −

int[] a = { 5, 10, 15, 20, 25, 30 };

Now, using Group by and orderby, we will find the elements greater than 20 −

var check = from element in a orderby element group element by chkGreater(element);

The following is the complete code −

Example

 Live Demo

using System;
using System.Linq;
class Demo {
   static void Main() {
      int[] a = { 5, 10, 15, 20, 25, 30 };
      var check = from element in a orderby element group element by chkGreater(element);
      foreach (var val in check) {
         Console.WriteLine(val.Key);
         foreach (var res in val) {
            Console.WriteLine(res);
         }
      }
   }
   static bool chkGreater(int a) {
      return a >= 20;
   }
}

Output

False
5
10
15
True
20
25
30

Karthikeya Boyini

Published on 05-Sep-2018 10:37:51

• Related Questions & Answers
• How to use order by, group by in c#?
• GROUP BY the number of rows returned by GROUP BY in MySQL?
• Listing all rows by group with MySQL GROUP BY?
• Group by dates in MongoDB?
• HAVING with GROUP BY in MySQL
• Group by element in array JavaScript
• Group objects by property in JavaScript
• MongoDB SELECT COUNT GROUP BY?
• Group by JavaScript Array Object
• Difference Between Group By and Order By in SQL
• String compare by == operator in Java
• SELECT DISTINCT vs GROUP BY in MySQL?
• Get rows with GROUP BY in MySQL?
• Group by dates in a MongoDB collection?
• MySQL group by for separate id without using GROUP BY to remove duplicate column row?