Apply `Command.MergeMyResults()` to a command added as a `CommandInfo` by mjr4077au · Pull Request #28280 · PowerShell/PowerShell

Mitch Richters (mjr4077au) · 2026-10-29T08:50:20Z

PR Summary

LocalPipeline builds a command added by name through Command.CreateCommandProcessor(), which applies the merge settings from Command.MergeMyResults(), but builds a command added as a CommandInfo itself and skipped them. That path now calls Command.SetMergeSettingsOnCommandProcessor(), made internal for it, once the parameters are added, as the by-name path does.

PR Context

Seen on Windows PowerShell 5.1 and PowerShell 7.6.9:

$ps = [powershell]::Create()
$null = $ps.AddCommand((Get-Command -Name Write-Error)).AddParameter('Message', 'boom')
$ps.Commands.Commands[0].MergeMyResults('Error', 'Output')
$ps.Invoke()   # returns nothing; the error is in $ps.Streams.Error

Adding 'Write-Error' by name instead returns the error as output.

A test covering both ways of adding the command is added to PSCommand.Tests.ps1. The CommandInfo case fails on master and passes with this change, and the engine/Api, PipelineBehaviour, RedirectionOperator, NativeCommandBytePiping, Splatting and Out-Default tests pass.

Related: #27674, which uses a command's CommandInfo in Command.CreateCommandProcessor(). It touches different lines and doesn't conflict with this change.

PR Checklist

🤖 Generated with Claude Code

`LocalPipeline` builds a command added by name through `Command.CreateCommandProcessor()`, which applies its merge settings, but builds one added as a `CommandInfo` itself without them, so `MergeMyResults("Error", "Output")` on `Write-Error` returned the error as output when it was added by name and left it in the error stream when added through `Get-Command` on both Windows PowerShell 5.1 and PowerShell 7.6.9, so that path now calls `Command.SetMergeSettingsOnCommandProcessor()`, made internal for it, once the parameters are added, as the by-name path does. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

azure-pipelines · 2026-10-29T08:50:31Z

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Copilot

🟢 Approval recommended

No active review issues are reported for the change aligning stream-merging behavior across command-addition paths.

No open issues 🎉

What changed in this PR

Fixes Command.MergeMyResults() being ignored for commands added as CommandInfo objects, aligning their stream-merging behavior with commands added by name.

Changes:

Applies merge settings after parameter setup in the CommandInfo path.
Makes the existing merge-settings helper accessible to LocalPipeline.
Adds regression tests for error-to-output merging through both command-addition paths.

File	Description
`test/powershell/engine/Api/PSCommand.Tests.ps1`	Tests error merging for commands added by name and by `CommandInfo`.
`src/System.Management.Automation/engine/hostifaces/LocalPipeline.cs`	Applies merge settings to commands constructed from `CommandInfo`.
`src/System.Management.Automation/engine/hostifaces/Command.cs`	Changes the merge-settings helper from private to internal.

_{Review effort: Balanced}

Mitch Richters (mjr4077au) · 2026-10-29T09:34:05Z

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Mitch Richters (mjr4077au) requested a review from a team as a code owner October 29, 2026 08:50

Copilot AI balanced review requested due to automatic review settings October 29, 2026 08:50

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Apply `Command.MergeMyResults()` to a command added as a `CommandInfo` - #28280

Apply `Command.MergeMyResults()` to a command added as a `CommandInfo`#28280
Mitch Richters (mjr4077au) wants to merge 1 commit into
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devicie:fix/commandInfoMergeMyResults

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Mitch Richters (mjr4077au) commented Oct 29, 2026

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