Continue execution on Exception - powershell

Question

Below is the script I want to execute. The issue here is once an exception occurs it stops executing, I used continue in the catch block but that did not work. How do I get it working even after an exception occurs it should loop in foreach.
I also used a while($true) loop but that went into infinite loop. How to go about it?
$ErrorActionPreference = "Stop";
try
{
# Loop through each of the users in the site
foreach($user in $users)
{
# Create an array that will be used to split the user name from the domain/membership provider
$a=#()
$displayname = $user.DisplayName
$userlogin = $user.UserLogin
# Separate the user name from the domain/membership provider
if($userlogin.Contains('\'))
{
$a = $userlogin.split("\")
$username = $a[1]
}
elseif($userlogin.Contains(':'))
{
$a = $userlogin.split(":")
$username = $a[1]
}
# Create the new username based on the given input
$newalias = $newprovider + "\" + $username
if (-not $convert)
{
$answer = Read-Host "Your first user will be changed from $userlogin to $newalias. Would you like to continue processing all users? [Y]es, [N]o"
switch ($answer)
{
"Y" {$convert = $true}
"y" {$convert = $true}
default {exit}
}
}
if(($userlogin -like "$oldprovider*") -and $convert)
{
LogWrite ("Migrating User old : " + $user + " New user : " + $newalias + " ")
move-spuser -identity $user -newalias $newalias -ignoresid -Confirm:$false
LogWrite ("Done")
}
}
}
catch {
LogWrite ("Caught the exception")
LogWrite ($Error[0].Exception)
}

Answer 1

You use try {...} catch {...} when you want to handle errors. If you want to ignore them, you should set $ErrorActionPreference = "Continue" (or "SilentlyContinue") as #C.B. suggested, or use -ErrorAction "SilentlyContinue" for the particular operation raising the error. If you want to handle errors from a certain instruction, you'd put that instruction in the try {...} catch {...} block, not the entire loop, e.g.:
foreach($user in $users) {
...
try {
if(($userlogin -like "$oldprovider*") -and $convert) {
LogWrite ("Migrating User old : " + $user + " New user : " + $newalias + " ")
move-spuser -identity $user -newalias $newalias -ignoresid -Confirm:$false
LogWrite ("Done")
}
} catch {
LogWrite ("Caught the exception")
LogWrite ($Error[0].Exception)
}
}

Answer 2

You seem to have placed the "catch" outside the loop body, so that aborts the loop. Put the catch inside the loop

Answer 3

Modified the code as below. Used the following piece of code after move-spuser -identity $user -newalias $newalias -ignoresid -Confirm:$false
if($?)
{
LogWrite ("Done!")
LogWrite (" ")
}
else
{
LogWrite ($Error[0].ToString())
LogWrite (" ")
}

Answer 4

Something that worked for me is to set the $ErrorActionPreference variable to stop, and then reset it back to continue in the catch block:
$e = $ErrorActionPreference
$ErrorActionPreference="stop"
try
{
#Do Something that throws the exception
}
catch
{
$ErrorActionPreference=$e
}
$ErrorActionPreference=$e;