How to find the Element with Maximum Number of Occurrences in a List in C# - Step by Step Examples

How to find the Element with Maximum Number of Occurrences in a List in C# ?

Answer

To find the element with the maximum number of occurrences in a list in C#, you can use the GroupBy and OrderByDescending methods from LINQ.


✐ Examples

1 Find Most Frequent Integer in List

In this example,

  1. We include the System.Linq namespace.
  2. We create a list named data with several integer elements.
  3. We use the GroupBy method to group the elements by their value.
  4. We use the OrderByDescending method to order the groups by their count in descending order and select the first element.
  5. Finally, we print the most common element to the console.

C# Program

using System;
using System.Collections.Generic;
using System.Linq;

class Program {
    static void Main() {
        List<int> data = new List<int> { 1, 2, 2, 3, 3, 3, 4 };
        var mostCommon = data.GroupBy(x => x)
                             .OrderByDescending(g => g.Count())
                             .First()
                             .Key;
        Console.WriteLine("Element with the maximum occurrences is: " + mostCommon);
    }
}

Output

Element with the maximum occurrences is: 3

2 Find Most Frequent String in List

In this example,

  1. We include the System.Linq namespace.
  2. We create a list named data with several string elements.
  3. We use the GroupBy method to group the elements by their value.
  4. We use the OrderByDescending method to order the groups by their count in descending order and select the first element.
  5. Finally, we print the most common element to the console.

C# Program

using System;
using System.Collections.Generic;
using System.Linq;

class Program {
    static void Main() {
        List<string> data = new List<string> { "apple", "banana", "apple", "orange", "banana", "apple" };
        var mostCommon = data.GroupBy(x => x)
                             .OrderByDescending(g => g.Count())
                             .First()
                             .Key;
        Console.WriteLine("Element with the maximum occurrences is: " + mostCommon);
    }
}

Output

Element with the maximum occurrences is: apple

Summary

In this tutorial, we learned How to find the Element with Maximum Number of Occurrences in a List in C# language with well detailed examples.


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