Repository navigation
Declare an Empty Array in C#: .NET 10, collection expression, stronger tests - #2288
Merged
vladimir-pecanac-main merged 2 commits intoOct 14, 2026
Conversation
…ssert empty and shared instance - Retarget EmptyStringArrayFactory and Tests from net7.0 to net10.0. This lands in the same commit as the [] factory method, because a collection expression fails CS9058 under the C# 11 that net7.0 selects. - Tests: Microsoft.NET.Test.Sdk 18.10.1, xunit 2.9.3, xunit.runner.visualstudio 4.0.1, coverlet.collector 10.1.0. - Add CreateEmptyArrayWithCollectionExpression() => []. - Rename the seven CreateEmptyArrayExampleN methods after their technique, and the tests with them. - File-scoped namespace in ArrayFactory.cs. - Tests now assert the array is empty, the unused _expectedSize field is gone, and two new tests pin that Array.Empty returns the same instance twice and that [] returns the Array.Empty instance.
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
1 participant
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Sample for "How to Declare an Empty Array in C#" (https://code-maze.com/csharp-how-to-declare-an-empty-array/), moved to .NET 10 for the article update. Only collections-arrays/DeclareAnEmptyStringArrayInCSharp changes.
What changes:
Packages (Tests project), re-queried on NuGet 2026-10-11, latest listed stable:
Verified locally on SDK 10.0.302, runtime 10.0.10: dotnet build -c Release 0 warnings 0 errors; dotnet test 10 passed, 0 failed (with the CI filter FullyQualifiedName!~Live); dotnet list package --vulnerable --include-transitive reports no vulnerable packages in either project.