The Importance of Removing Unnecessary Expression Values in Code in Microsoft .NET

When coding, it’s crucial to eliminate unnecessary expression values in order to improve code quality and performance. One specific issue related to this is the violation IDE0058, which can be addressed by configuring the following rule in the .editorConfig file:

dotnet_diagnostic.IDE0058.severity = warning

Fixing this issue not only enhances code style and readability but also brings about other significant benefits. Let’s explore some of these advantages in detail:

  1. Enhanced Performance: Unnecessary expressions can have a negative impact on the performance of your code. When certain computations or operations are carried out unnecessarily, the execution speed of the program can slow down. By removing such expressions, particularly within critical sections or loops, you can significantly improve the performance of your code.
  2. Simplified Debugging: Unnecessary expressions can introduce confusion during the debugging process. When troubleshooting an issue, irrelevant code can mislead or distract you from identifying the actual problem. By eliminating unnecessary expressions, you can streamline your focus towards the essential parts of the code, making it easier to locate and fix bugs.
  3. Improved Code Maintenance: Code maintenance can become more challenging when redundant or irrelevant expressions are present. Such code becomes harder to modify or extend in the future. By removing unnecessary expressions, you simplify the codebase, making it more maintainable and adaptable to future changes.

Considering the concerns related to performance, confusion during debugging, and code maintenance challenges, let’s examine an example illustrating this issue:

_memoryCache.Set(key, obj, new TimeSpan(0, minutes, 30));

In this example, _memoryCache represents an instance of IMemoryCache. To address the issue, we can use a discard, as shown below:

_ = _memoryCache.Set(key, obj, new TimeSpan(0, minutes, 30));

Discards act as placeholders for unassigned variables; they do not hold a value. By using a discard, you communicate your intent to the compiler and others who read your code: you explicitly indicate that you want to ignore the result of an expression. Discards serve as a useful tool in such scenarios.

In conclusion, removing unnecessary expression values is crucial for maintaining clean and efficient code. It improves performance, simplifies debugging, and enhances code maintainability. By following best practices and utilizing techniques like discards, you can ensure the overall quality and effectiveness of your codebase.

If you liked this article, please buy David a cup of Coffee by going here:

Pick up any books by David McCarter by going to

© The information in this article is copywritten and cannot be preproduced in any way without express permission from David McCarter.

Leave a Reply

Please log in using one of these methods to post your comment: Logo

You are commenting using your account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

This site uses Akismet to reduce spam. Learn how your comment data is processed.