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How do you document and share your custom LINQ extension methods with other developers?

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If you use LINQ to query and manipulate data in your C# applications, you might have created some custom extension methods to enhance its functionality. But how do you document and share your custom LINQ extension methods with other developers? In this article, you will learn some best practices to make your LINQ extensions reusable, readable, and maintainable.

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Paulo Zemek

Software Engineer - I talk to computers and they understand me even without AI, we just speak the same language

1 Use XML comments

The first step to document your custom LINQ extension methods is to use XML comments. XML comments are special comments that start with /// and follow a specific syntax to describe the purpose, parameters, return value, and exceptions of your methods. You can use Visual Studio or other tools to generate and edit XML comments. XML comments also enable IntelliSense, which provides helpful information and suggestions when you use your methods in code.

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2 Follow naming conventions

The second step to document your custom LINQ extension methods is to follow naming conventions. Naming conventions are rules that help you choose consistent and meaningful names for your methods, parameters, and variables. For LINQ extension methods, you should use PascalCase for method names, camelCase for parameter names, and descriptive names that indicate the functionality and data type of your methods. For example, a method that filters a collection of strings by length could be named FilterByLength.

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Paulo Zemek

Software Engineer - I talk to computers and they understand me even without AI, we just speak the same language
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The naming conventions don't really document anything. They just help in general to make things easier to reason about. Also, the naming conventions explained here apply to basically anything in .NET, so they aren't LINQ specific and I don't think they are needed in a LINQ specific article.

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3 Use generics and delegates

The third step to document your custom LINQ extension methods is to use generics and delegates. Generics and delegates are features of C# that allow you to write flexible and reusable code that can work with different types of data and logic. For LINQ extension methods, you should use generic type parameters to define your methods so that they can accept and return any type that implements IEnumerable<T>. You should also use delegates, such as Func<T, bool>, to pass predicates, selectors, or aggregators as parameters to your methods.

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Paulo Zemek

Software Engineer - I talk to computers and they understand me even without AI, we just speak the same language
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This time it is plain wrong. The usage of generics and delegates has absolutely nothing to do with documentation, and should only be used if the method really needs it. Methods like First() and Last() use generics because they want the type of the record to be effectively "anything"... yet, they don't use delegates because they don't need to. Also, delegates are things like Func<T>, Action<T> etc... what LINQ methods have are Expressions, like Expression<Func<T, bool>>. Expressions give much more information than a delegate and, usually, aren't executed... they are just analyzed to generate the right query.

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4 Write unit tests

The fourth step to document your custom LINQ extension methods is to write unit tests. Unit tests are code snippets that verify the correctness and behavior of your methods under different scenarios and inputs. You can use frameworks such as NUnit or xUnit to write and run unit tests in C#. Unit tests not only help you find and fix bugs, but also serve as documentation and examples for your methods.

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Paulo Zemek

Software Engineer - I talk to computers and they understand me even without AI, we just speak the same language
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Although some people might use the tests as some form of documentation... tests are, well, tests, not documentation. So far only the XML comments are really related to the documentation.

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5 Publish on NuGet or GitHub

The fifth step to document and share your custom LINQ extension methods is to publish them on NuGet or GitHub. NuGet is a package manager for .NET that allows you to create and distribute libraries of code that can be easily installed and used by other developers. GitHub is a platform for hosting and collaborating on code projects that can be accessed and modified by anyone. By publishing your custom LINQ extension methods on NuGet or GitHub, you can make them available and discoverable for the wider .NET community.

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6 Update and maintain

The sixth and final step to document and share your custom LINQ extension methods is to update and maintain them. Updating and maintaining your methods means that you should keep them compatible with the latest versions of C# and .NET, fix any issues or bugs that arise, and add new features or improvements as needed. You should also communicate with your users and collaborators, respond to feedback and requests, and document any changes or updates in your code or documentation.

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7 Here’s what else to consider

This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?

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How do you document and share your custom LINQ extension methods with other developers?

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1 Use XML comments

2 Follow naming conventions

3 Use generics and delegates

4 Write unit tests

5 Publish on NuGet or GitHub

6 Update and maintain

7 Here’s what else to consider

Language Integrated Query (LINQ)

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