In the example, the add-member command is broken into two lines before -Value. And then the assignment statement "$To.$($p.Name) = $From.$($p.Name)" needs to be on its own line. But it doesn't seem to be needed anyway (or -force). Also, I added ",NoteProperty" to the foreach line, otherwise it usually comes up empty. This method doesn't add properties to strings. I don't know how get-content does it.

function Copy-Property ($From, $To)
{
  foreach ($p in Get-Member -InputObject $From -MemberType Property,NoteProperty)
  {
    Add-Member -InputObject $To -MemberType NoteProperty -Name $p.Name -Value $From.$($p.Name) 
  }
}

Document Details

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• ID: 92e17fc3-bf10-f09d-8102-da5fe518838b
• Version Independent ID: 6441c722-b93a-1746-e38a-29a6722fc0a3
• Content: Add-Member (Microsoft.PowerShell.Utility)
• Content Source: reference/6/Microsoft.PowerShell.Utility/Add-Member.md
• Product: powershell
• Technology: powershell-cmdlets
• GitHub Login: @JamesWTruher
• Microsoft Alias: jimtru