How to catch an exception thrown in another Powershell script?

Question

I have a two Powershell scripts; main.ps1 and sub.ps1. main.ps1 calls sub.ps1. Sometimes sub.ps1 throws an exception. Is it possible to catch the exception thrown by sub.ps1 from main.ps1 ?

Example main.ps1:

try{. .\sub.ps1;}
catch
{}
finally
{}

Example sub.ps1:

throw new-object System.ApplicationException "I am an exception";

Roman Kuzmin · Accepted Answer · 2010-05-13 11:31:27Z

6

Here is a simple example:

try {
    sub.ps1
}
catch {
    Write-Warning "Caught: $_"
}
finally {
    Write-Host "Done"
}

Use help about_Try_Catch_Finally for more details. Yet another way is to use trap, see help about_trap. If you have some C# or C++ background then I would recommend to use Try_Catch_Finally approach (but it also depends on what exactly you do).

answered May 13, 2010 at 11:31

Roman Kuzmin

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6 Comments

David Andreoletti Over a year ago

Thanks for the answer but it has not solved the problem. I use dot sourcing to call the script. Could it be the problem ?

Roman Kuzmin Over a year ago

It works for me with dot sourcing or not. The problem is elsewhere then, more information might help. What errors exactly do you get?

Roman Kuzmin Over a year ago

Are you sure that sub.ps1 throws an exception and not just writes an error? Try this $ErrorActionPreference = 'stop' before call of sub.ps1

David Andreoletti Over a year ago

I found the problem. In my catch statement, there was nothing written to the output to indicate the exception was catched. Your solution definitely works. Thanks.

Roman Kuzmin Over a year ago

Still works for me with your exception.. What error do you get when you run main.ps1? Or what exactly happens? Nothing at all? Can you take a look at your $Error list?

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