Make Export-Csv -Append and -NoHeader mutually exclusive by yotsuda · Pull Request #26472 · PowerShell/PowerShell

…exclusive

- Add validation in ExportCsvCommand.BeginProcessing() to throw an error
  when both -Append and -NoHeader parameters are specified together
- Add error message resource: CannotSpecifyAppendAndNoHeader
- Add Pester test to verify the error is thrown correctly

This prevents undefined behavior when users attempt to append to a CSV
file without headers, which could result in data corruption or confusion.

yotsuda changed the title Fix #25820: Make Export-Csv -Append and -NoHeader mutually exclusive Make Export-Csv -Append and -NoHeader mutually exclusive

iSazonov added the CL-General

label

yotsuda deleted the fix/export-csv-validation branch

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