Emulating -ErrorAction in custom powershell function

Question

How to emulate -ErrorAction in custom powershell function. For example consider the following script

function Foo2
{
  Write-Host "in Foo2"
  #...Error occurs 
  Foo3
}

function Foo1
{
   Write-Host "in Foo1"
   Foo2
}

function Foo3
{
   Write-Host "in Foo3"
}

PS>Foo1 -ErrorAction stop

Is it possible to stop the execution of Foo1 when error occurs in Foo2, instead of proceeding with execution of Foo3 ?

Answer 1

get-help about_Functions_CmdletBindingAttribute

You want:

function Foo1() {
 [CmdletBinding()]
 PARAM()
 process{
   Write-Host "in Foo1"
   Foo2
 }
}

This is not about emulation, it means really implementing common parameters in your function; if this was your intention.

---

After that, you can work like this:

Foo1 -ErrorAction stop

You can use the same syntax for Foo2 and Foo3.

---

To log error use redirection as usual.

Answer 2

Here is a sample to illustrate @Empo Answer

function Test-ErrorAction
{
  [CmdletBinding()]
  Param( )

  begin 
  {
    Write-Host "I'am Here"    
   }

  Process 
  {
    Write-Error "coucou"
  }
  end 
  {
    Write-Host "Done !"
  }
}

clear
Test-ErrorAction -ErrorAction "silentlycontinue"
Test-ErrorAction -ErrorAction "stop"

gives

I'am Here
Done !
I'am Here
coucou
 à C:\Développements\Pgdvlp_Powershell\Sources partagées\Menus Contextuel Explorer\Test-ErrorAction.ps1: ligne:23 caractère:17
+ Test-ErrorAction  <<<< -ErrorAction "stop"

Answer 3

function Foo2
{
 Write-Host "in Foo2"
 Try {something} 
   Catch {
             Write-host "Foo2 blew up!"
             return
             }
 Foo3
 }