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Declare an Empty Array in C#: .NET 10, collection expression, stronger tests - #2288
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…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.
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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.