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Readonly Modifier in C#: retarget net10.0, Playlist, Counter/Tally trap, Book init property - #2303
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…ap, Book init property, three tests Both projects net7.0 to net10.0. Microsoft.NET.Test.Sdk 18.11.0, xunit 2.9.3, xunit.runner.visualstudio 4.0.1, coverlet.collector 10.1.0. New Playlist (a readonly List<string> field that still accepts items; the reassignment in Reset() stays commented out as a compiler error), Counter (a mutable struct with a readonly Describe() method), Tally (a readonly Counter field whose Increment() calls run on a defensive copy, so Total stays 0) and Book (required init-only Title). Program.cs prints each one. Three new tests: the readonly list changes, the readonly struct field total stays 0, and a Counter variable increments to 2. Existing files and tests unchanged.
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Sample update for the article "Readonly Modifier in C#" (https://code-maze.com/csharp-readonly-modifier/). Touches only
csharp-intermediate-topics/ReadOnlyModifierInCSharp.Playlist: areadonly List<string>field that still accepts items; the reassignment inReset()stays commented out as a compiler error, matching the sample's convention.Counter(mutable struct with areadonly Describe()method) andTally(areadonly Counterfield:Increment()runs on a defensive copy, soTotalstays 0).Bookwith arequiredinit-onlyTitle.Program.csprints each one. Three new tests pin the readonly list change, theTotalof 0 and aCountervariable reaching 2. Existing files and tests unchanged.Local run on SDK 10.0.302 / .NET 10.0.10: build 0 warnings, 0 errors; tests 5 passed, 0 failed;
dotnet list package --vulnerable --include-transitivereports none.