How to handle failed variable assignments in powershell? [duplicate]

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What your Get-ItemProperty call emits is a non-terminating error, whereas try / catch only catches terminating errors.

  • Non-terminating errors are far more common that terminating ones.

Use common parameter -ErrorAction Stop to promote (the first) non-terminating error generated by a cmdlet to a terminating one that try / catch handles.

You can generally achieve the same effect by setting preference variable
$ErrorActionPreference="Stop" beforehand, but note that doing so has no effect on calls to external programs and on functions implemented in modules.

See also:

  • The about_Try_Catch_Finally help topic.

  • A description of the fundamental error types in the context of guidance for command authors on when to emit a terminating vs. a non-terminating error: this answer.

  • A comprehensive overview of PowerShell’s surprisingly complex error handling: this GitHub docs issue.

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