How to Calculate the Sum of a Property in a C# List of Objects Using LINQ?

Efficiently Summing Properties in C# Object Lists with LINQ

Working with collections of objects frequently requires aggregating data from individual elements. A common task is calculating the sum of a specific property across all objects. C#'s LINQ (Language Integrated Query) provides an elegant solution.

Leveraging LINQ's Sum() Method

LINQ's Sum() method offers a concise way to achieve this. Instead of attempting direct access like myList.amount.Sum(), which is syntactically incorrect, use the following LINQ expression:

Example:

To sum the "amount" property from a list of objects, use:

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

Explanation:

• myList: Your list of objects.
• Sum(): The LINQ aggregate function that calculates the sum of numeric values in a sequence.
• item => item.Amount: A lambda expression that selects the Amount property from each item in the myList.

This single line efficiently computes the total sum of the Amount property. This approach is far more readable and maintainable than manual iteration.

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