Error dealing with is a essential side of writing strong scripts in any programming language. PowerShell supplies a robust construction for dealing with errors gracefully utilizing attempt, catch, and lastly blocks. These constructs permits us to handle exceptions and make sure that vital cleanup actions are carried out, even when errors happen. On this weblog publish, I’ll present you easy methods to use attempt catch lastly in PowerShell. Let’s leap in.
Understanding Attempt, Catch, and Lastly
The attempt block incorporates the code that will produce an error. If an error happens, the catch block is executed, permitting you to deal with the error. The lastly block is non-obligatory and incorporates code that runs no matter whether or not an error occurred or not.
Let’s check out the syntax.
attempt {
# Code which may throw an exception
} catch {
# Code to deal with the error
} lastly {
# Code that runs no matter whether or not an error occurred
}
Listed below are two extra examples you’ll be able to construct on.
Attempt {
1/0
}
Catch {
$_.Exception # Error Message
}
On this instance, the error message shall be displayed if an error happens. You may know the $_ variable as a pipeline variable.
And right here one other instance which is extra virtually and it’s a actual world state of affairs.
$ErrorActionPreference="Cease"
Attempt {
Get-ChildItem -Path C:notthere
}
Catch {
Write-Warning "Folder not current."
}
You might now ask why I used the $ErrorActionPreference variable. Attempt it out with out altering error dealing with! I can’t work!
On this instance, setting ErrorActionPreference to Cease ensures that the Get-ChildItem command’s non-terminating error is caught by the catch block, permitting for acceptable error dealing with. The error won’t be a terminating error, it’s actually a non terminating error, inflicting PowerShell to disregard the Catch block.
With try-catch blocks, it is best to subsequently all the time keep in mind that the error could possibly be a non-terminating error that ignores your catch perform.
