Is there a way to pass serializable objects to a PowerShell script with start-process?

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Yes. As PetSerAl wrote in a comment, you can use the PSSerializer class to handle that:

$ser = [System.Management.Automation.PSSerializer]::Serialize($credential)

$cred = [System.Management.Automation.PSSerializer]::Deserialize($ser)

I don’t know if your process will understand the CliXML format though; you don’t specify what process you’re starting.

Since this will produce XML which is multi-line, it may not work to pass this to a process as a parameter which is why PetSerAl is including the code to Base64 encode the resulting XML.

You might also be able to pass the XML over STDIN instead of Base64 encoding, which also ensures that you won’t accidentally hit the command line size limit.

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