Skip to content

Update value equality article with records examples, detailed justifications, and improved formatting #48010

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 6 commits into from
Aug 20, 2025

Conversation

Copilot
Copy link
Contributor

@Copilot Copilot AI commented Aug 19, 2025

Enhanced the "How to define value equality for a class or struct" article to better address modern C# practices and provide clear guidance on implementation approaches.

Key Changes

1. Prominently Position Records as the Preferred Approach

Added a prominent TIP block at the beginning to clearly recommend records first, with conditional guidance for when manual implementation is needed:

Tip

Consider using records first. Records automatically implement value equality with minimal code, making them the recommended approach for most data-focused types.

2. Added Comprehensive Record Example

Created a new "Record example" section with a complete working demonstration showing:

  • Automatic value equality implementation
  • Correct inheritance behavior (unlike problematic class scenarios)
  • Seamless collection compatibility
  • Performance benefits over reflection-based approaches

3. Added Detailed Justifications for Manual Implementation Steps

Each of the 5 implementation steps now includes clear explanations of WHY they're needed:

  • Override Equals(object): For polymorphic behavior and object compatibility
  • Implement IEquatable: For type-safe, performant comparisons
  • Override == and != operators: For consistent syntax expectations
  • Override GetHashCode: For hash-based collection compatibility
  • Implement IComparable (optional): For sorting operations

4. Improved Documentation Quality

  • Simplified record syntax examples
  • Moved code comments to documentation text for proper localization
  • Applied consistent formatting to numbered lists
  • Used TIP block format to highlight the key recommendation

The article now provides a modern, comprehensive guide that prioritizes the recommended approach while still providing complete guidance for manual implementation scenarios.


✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.


Internal previews

📄 File 🔗 Preview link
docs/csharp/programming-guide/statements-expressions-operators/how-to-define-value-equality-for-a-type.md docs/csharp/programming-guide/statements-expressions-operators/how-to-define-value-equality-for-a-type

…fications

Co-authored-by: BillWagner <493969+BillWagner@users.noreply.github.com>
@Copilot Copilot AI changed the title [WIP] Update for records, and add justifications Update value equality article with records examples and detailed justifications Aug 19, 2025
Copilot finished work on behalf of BillWagner August 19, 2025 19:36
@Copilot Copilot AI requested a review from BillWagner August 19, 2025 19:36
Copy link
Member

@BillWagner BillWagner left a comment

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Overall, this is good. I've got a couple suggestions for you.

@BillWagner
Copy link
Member

@copilot Address the unresolved comments.

Co-authored-by: BillWagner <493969+BillWagner@users.noreply.github.com>
Copy link
Contributor Author

Copilot AI commented Aug 20, 2025

@copilot Address the unresolved comments.

All review comments have been addressed in commit b0dc7bc. Made the requested formatting and content changes.

Copilot finished work on behalf of BillWagner August 20, 2025 14:25
@Copilot Copilot AI requested a review from BillWagner August 20, 2025 14:25
Copy link
Member

@BillWagner BillWagner left a comment

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

This is now ready for final review.

@BillWagner BillWagner marked this pull request as ready for review August 20, 2025 14:54
@BillWagner BillWagner requested a review from a team as a code owner August 20, 2025 14:54
@BillWagner BillWagner requested a review from adegeo August 20, 2025 14:54
Co-authored-by: Genevieve Warren <24882762+gewarren@users.noreply.github.com>
Co-authored-by: BillWagner <493969+BillWagner@users.noreply.github.com>
Copy link
Contributor Author

Copilot AI commented Aug 20, 2025

This is now ready for final review.

All new comments have been addressed. The records recommendation is now highlighted in a TIP block format as requested.

@BillWagner BillWagner enabled auto-merge (squash) August 20, 2025 20:29
@Copilot Copilot AI changed the title Update value equality article with records examples and detailed justifications Update value equality article with records examples, detailed justifications, and improved formatting Aug 20, 2025
@Copilot Copilot AI requested a review from BillWagner August 20, 2025 20:30
Copilot finished work on behalf of BillWagner August 20, 2025 20:30
@BillWagner BillWagner merged commit 02d57e4 into main Aug 20, 2025
10 checks passed
@BillWagner BillWagner deleted the copilot/fix-42333 branch August 20, 2025 20:31
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Projects
None yet
Development

Successfully merging this pull request may close these issues.

3 participants