WriteToCsv: net10.0, CsvHelper 33.1.0 and the article's examples

[vladimir-pecanac-main]

Sample update for the article "Writing to a CSV File in C#" (https://code-maze.com/csharp-writing-csv-file/). Only files-csharp/WriteToCsv changes.

Retarget

• WriteToCsv and WriteToCsvTests move from net6.0 to net10.0.
• CsvHelper 27.2.1 to 33.1.0 in both projects, in the same commit as the retarget: 33.1.0 ships no net6.0 or net7.0 asset (its net9.0 asset is what a net10.0 project resolves).

Package versions used (re-queried on NuGet on 2026-10-11, latest listed stable)

• CsvHelper 33.1.0
• Microsoft.NET.Test.Sdk 18.10.1
• MSTest.TestAdapter 4.5.1
• MSTest.TestFramework 4.5.1
• coverlet.collector 10.1.0

Code

• Person.Name is initialised to string.Empty, which clears CS8618 under Nullable enable. The article's snippet keeps public string Name { get; set; } on purpose (it never shows the project file), so the article and this file differ there by design; please do not "fix" either side back.
• WriteMethods gains one method per article section: WriteWithDefaultSettings, WriteWithoutHeader, WriteWithClassMap (PersonMap), AppendPersons, WriteTrickyValues (Contact), WritePersonsAsync, and WriteEmployees. Employee carries every attribute in the article's attribute table, including the class-level Delimiter and HasHeaderRecord, which take effect only through CsvConfiguration.FromAttributes.
• The existing WritePersonsWithDoB method, Program.cs and the existing test are unchanged.
• The test project does not set ImplicitUsings, so WriteMethodsTests.cs carries its own using lines.

Tests

• WriteMethodsTests adds one test per new method and asserts the exact CSV text: the quoted comma field and doubled quote, the appended rows without a header, the ClassMap header, the byte-identical async output, and both Employee outputs.
• dotnet build -c Release: 0 warnings, 0 errors. dotnet test: 9 passed, 0 failed (SDK 10.0.302, runtime 10.0.10).
• dotnet list package --vulnerable --include-transitive: no vulnerable packages in either project.