How to use IEnumerable, ICollection, IList, and IQueryable in C#

December 21, 2023

The C# programming language provides excellent support for working with collections of data. C# includes several classes and interfaces that can help you query collections of data efficiently. The most commonly used interfaces for working with collections are IEnumerable, ICollection, IList, and IQueryable.

In this article we will examine each of these interfaces and discuss how we can work with them in .NET 8, illustrated with code examples.

Create a console application project in Visual Studio

First off, let’s create a .NET Core console application project in Visual Studio. Assuming Visual Studio 2022 is installed in your system, follow the steps outlined below to create a new .NET Core console application project.

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