How Can I Sort a List by an Object Property in C# Using LINQ?

Efficiently Sorting Lists of Objects in C# using LINQ

When dealing with lists of custom objects in C#, the need to sort these lists based on specific object properties frequently arises. For instance, imagine a list of Order objects, each possessing properties like OrderId, OrderDate, Quantity, and Total. This article demonstrates how to efficiently sort such lists using LINQ.

Leveraging LINQ for Sorting

LINQ (Language Integrated Query) offers a clean and powerful way to query and manipulate data, including sorting lists. Let's explore how to sort our list of Order objects.

To sort the list by OrderDate in ascending order, use the OrderBy() method:

<code class="language-csharp">List<Order> sortedOrders = objListOrder.OrderBy(o => o.OrderDate).ToList();</code>

This creates a new list, sortedOrders, containing the original Order objects sorted by their OrderDate property. The lambda expression o => o.OrderDate specifies the sorting criteria.

For descending order sorting by OrderId, employ the OrderByDescending() method:

<code class="language-csharp">List<Order> sortedOrders = objListOrder.OrderByDescending(o => o.OrderId).ToList();</code>

The flexibility of LINQ extends to multi-level sorting. For example, to sort primarily by OrderDate and then by OrderId (both ascending), use ThenBy():

<code class="language-csharp">List<Order> sortedOrders = objListOrder.OrderBy(o => o.OrderDate).ThenBy(o => o.OrderId).ToList();</code>

This approach provides a concise and efficient method for complex sorting scenarios, making it a preferred technique for managing lists of objects in C#.

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