How to Calculate the Sum of an Object Property in a C# List?

Summing Object Properties in C# Lists: A Concise Guide

Frequently, C# developers need to calculate the sum of a specific property within a list of objects. While Sum() readily handles primitive types like double, object properties require a slightly different approach.

Let's say you have a list of objects, each possessing an "Amount" property. Simply using myList.amount.Sum() is incorrect.

The correct method leverages LINQ's Sum() with a lambda expression:

<code class="language-csharp">double total = myList.Sum(item => item.Amount);</code>

Explanation:

• myList: Your list of objects.
• .Sum(...): The LINQ extension method that iterates, applies a function, and sums the results.
• item => item.Amount: A lambda expression. For each item in myList, it extracts the Amount property.
• total: The variable storing the final sum.

This efficiently iterates through the list, accesses each object's Amount property, and calculates the total.

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