Powershell terminate execution - powershell

Question

I am using powershell to process csv files in a directory when no file found with current date stamp I want the process to raise an error notifying file not found and exit.
# Powershell raise error and exit
# File name: sale_2020_02_03.csv
$getLatestCSVFile = Get-ChildItem -Path $Folder -Filter "*.csv" | Sort-Object LastWriteTime -Descending | Select-Object -First 1
if ($getLatestCSVFile)
{
try
{
# Process .csv file
}
catch
{
# on error
$ErrorMessage = $_.Exception.Message
throw "$ErrorMessage"
}
}
else
{
# If current date file not found raise error and exit
Send-MailMessage
throw "File not found"
}

Answer 1

As for this...
I would like to have the powershell script to stop execution
... that is what the Exit keyword is for or the '-ErrorAction Stop' option is for.
As for this...
if the code gets into the else block in the else block I want to
notify file not found
... as per my above, same thing, and you have to set that.
Meaning stuff like ...
Clear-Host
$Error.Clear()
try
{
# Statement to try
New-Item -Path 'D:\Temp\DoesNOtExist' -Name 'Test.txt' -ItemType File -ErrorAction Stop
}
catch
{
# What to do with terminating errors
Write-Warning -Message $Error[0]
}
# Results
<#
WARNING: Could not find a part of the path 'D:\Temp\DoesNOtExist\Test.txt'.
#>
Or using multiple catch statements, like ...
Example: Force file warning
Clear-Host
$Error.Clear()
try
{
# Results in NoSupportException
# Statement to try
New-Item -Path 'D:\Temp\Temp' -Name my:Test.txt -ItemType File -ErrorAction Stop
# Results in DirectoryNotFoundException
# New-Item -Path 'D:\Temp\Temp' -Name 'Test.txt' -ItemType File -ErrorAction Stop
}
catch [System.NotSupportedException]
{
# What to do with terminating errors
Write-Warning -Message 'Illegal chracter or filename.'
}
catch [System.IO.DirectoryNotFoundException]
{
# What to do with terminating errors
Write-Warning -Message 'The path is not valid.'
}
catch
{
# What to do with terminating errors
Write-Warning -Message 'An unexpected error occurred.'
}
# Results
<#
WARNING: Illegal character or filename.
#>
Example: Force path warning
Clear-Host
$Error.Clear()
try
{
# Results in NoSupportException
# Statement to try
# New-Item -Path 'D:\Temp\Temp' -Name my:Test.txt -ItemType File -ErrorAction Stop
# Results in DirectoryNotFoundException
New-Item -Path 'D:\Temp\Temp' -Name 'Test.txt' -ItemType File -ErrorAction Stop
}
catch [System.NotSupportedException]
{
# What to do with terminating errors
Write-Warning -Message 'Illegal chracter or filename.'
}
catch [System.IO.DirectoryNotFoundException]
{
# What to do with terminating errors
Write-Warning -Message 'The path is not valid.'
}
catch
{
# What to do with terminating errors
Write-Warning -Message 'An unexpected error occurred.'
}
# Results
<#
WARNING: The path is not valid.
#>
See also this discussion, which is a similar use case. Pay particular attention the the 'Exit vs Return vs Break' answer.
Terminating a script in PowerShell