Return Error from Sub-PowerShell Process

Q: If I have an error in a sub-PowerShell process, the parent Windows PowerShell process doesn't see the error or return an error--how can I fix this?

A: Consider a regular error in PowerShell:

Throw "Error Here"

The PowerShell process would display the error, and you would be aware of the error.

Now consider:

PowerShell {Throw "Error from within"}

The error would be unknown and wouldn't stop the parent PowerShell process. One easy solution is to set global error handling for PowerShell:

$Global:ErrorActionPreference = "Stop"PowerShell {Throw "Error from within"}

Now an error in the sub-process will still throw an error in the parent PowerShell process.

Another option is to actually track error state using variables and pass those variables back as the result of a called PowerShell process. For example, within the sub-PowerShell process,I could use:

$Global:ErrorActionPreference = "Stop"$ErrorState = 0$ErrorMessage = "No Error"Try{    Throw "Error happened here"}Catch {    $ErrorState = 1    $ErrorMessage = $Error[0].Exception.ToString()}

Notice in the event of error, I set the error state and actual message into a variable. This could then be passed back to the calling PowerShell process.