Catch ParameterBindingException

Hello,

I got the following problem. I created a function and want to pass a
parameter, lets call it e. I know how to add this like:

function xyz([boolean]$e=$false)
{
if ($e) {Write-Host "E was set");
}

everything is OK when I call it like that: xyz -e 1 or xyz -e $true

But what if I just want to know if the parameter is present and do not
want to pass a value like: xyz -e -> This should produce the same output
as above.

Everytime I carry out the last command, it throws a
ParameterBindingException. The problem is that I cannot trap this
exception in the function itself.

Anybody an idea what to do ? My last solution was to handle the
parameters by myself. But I hope there is a solution to do this like the
above function in a way.

Manfred

does this do what you want?

function xyz
{
param ([boolean] $e=$false)
if ($e) {Write-Host "E was set"}
else {Write-Host "E was NOT set"}
}


--
Richard Siddaway

Please note that all scripts are supplied "as is" and with no warranty


"Manfred" wrote:

> Hello,
>
> I got the following problem. I created a function and want to pass a
> parameter, lets call it e. I know how to add this like:
>
> function xyz([boolean]$e=$false)
> {
> if ($e) {Write-Host "E was set");
> }
>
> everything is OK when I call it like that: xyz -e 1 or xyz -e $true
>
> But what if I just want to know if the parameter is present and do not
> want to pass a value like: xyz -e -> This should produce the same output
> as above.
>
> Everytime I carry out the last command, it throws a
> ParameterBindingException. The problem is that I cannot trap this
> exception in the function itself.
>
> Anybody an idea what to do ? My last solution was to handle the
> parameters by myself. But I hope there is a solution to do this like the
> above function in a way.
>
> Manfred
>

It sounded like he was looking for SWITCH. Does this do what you want:

function xyz([Switch]$e)
{
if ($e) {Write-Host "E was Set"}
else {Write-Host "E was NOT set"}
}

PS> xyz -e
E was Set
PS> xyz
E was NOT set
PS> xyz -e:$true
E was Set
PS> xyz -e:$false
E was NOT set
PS> xyz -e:1
--
Jeffrey Snover [MSFT]
Windows PowerShell Architect
Microsoft Corporation
This posting is provided "AS IS" with no warranties, no confers rights.