Calculate sum of all Dictionary values in C#

This post will discuss how to calculate the sum of all values in a Dictionary<TKey,TValue> in C#.

1. Using `Enumerable.Sum()` Method

A simple solution is to compute the sum of all values in a Dictionary is using the built-in numeric aggregation method Sum() from LINQ. The following code example demonstrates its usage.

using System;

using System.Linq;

using System.Collections.Generic;

public class Example

{

public static void Main()

{

Dictionary<string, int> dict = new Dictionary<string, int>();

dict.Add("A", 1);

dict.Add("B", 2);

dict.Add("C", 3);

dict.Add("D", 4);

var total = dict.Sum(x => x.Value);

Console.WriteLine(total); // 10

}

Download Run Code

2. Using foreach loop

If you don’t want to use LINQ, you can just iterate through the Dictionary using a foreach loop and sum up all values. This would translate to a simple code below:

using System;

using System.Collections.Generic;

public static class Extensions

{

public static int SumOfValue<K>(this IDictionary<K,int> dict)

{

int total = 0;

foreach (int value in dict.Values) {

total += value;

}

return total;

}