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C# / .NET - count number of element occurrences in List
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In this article, we would like to show you how to count number of element occurrences in List in C#.
Quick solution:
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List<string> myList = new List<string> { "A", "B", "B", "C", "C", "C" };2
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var occurrences = myList.GroupBy(x => x).ToDictionary(y => y.Key, z => z.Count());4
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// Output:6
// [A, 1]7
// [B, 2]8
// [C, 3]
In this example, we use methods from System.Linq to group items into key / value pairs, where key is the item name and value is the number of occurrences.
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using System;2
using System.Linq;3
using System.Collections.Generic;4
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public class Program6
{7
public static void Main()8
{9
List<string> myList = new List<string> { "A", "B", "B", "C", "C", "C" };10
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var occurrences = myList.GroupBy(x => x).ToDictionary(y => y.Key, z => z.Count());12
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foreach (var item in occurrences)14
Console.WriteLine(item);15
}16
}Output:
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Output:2
[A, 1]3
[B, 2]4
[C, 3]