In much of the source code I analyze, I often come across LINQ expressions that utilize Lambda expressions combined with methods like Where() and FirstOrDefault(). While this approach may serve its purpose, it can make the code less readable and less performant. Here is an example of such a situation:

var result = people.Where(p => p.BornOn.UtcTicks >
             1000).FirstOrDefault();

Since the FirstOrDefault() method can also incorporate a predicate, the solution is to remove the Where() method and place FirstOrDefault() directly, as illustrated in this example:

var result = people.FirstOrDefault(p => p.BornOn.UtcTicks > 
             1000);

This approach is not only more readable but also exhibits a 1.9 times performance improvement in .NET 8!

This is related to violation IDE0120 and this is how I have it setup in my .editorConfig: dotnet_diagnostic.IDE0120.severity = warning

Summary

While reviewing the codebase I utilized for this article, I discovered 26 occurrences where the code needs to be fixed.

For further guidance and insights, I highly recommend obtaining a copy of my book, “Rock Your Code: Coding Standards for Microsoft .NET” available on Amazon.com. Additionally, to explore more performance tips for .NET, I encourage you to acquire the 3rd edition of “Rock Your Code: Code & App Performance for Microsoft .NET” also available on Amazon.com.

To analyze your code using the same settings I used in these articles, I encourage you to incorporate my EditorConfig file. It can be found at the following link: https://bit.ly/dotNetDaveEditorConfig. I update this file quarterly, so remember to keep yours up to date as well. I hope you will check out my OSS project Spargine by using this link: https://bit.ly/Spargine.

Please feel free to leave a comment below. I would appreciate hearing your thoughts and feedback.

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