powershell - How do I get topshelf to return error code when command fails? -

i trying start service powershell fails. don't know why fails not point here. when trying start host don't correct exit code automatic deploy fails silently.

what i'm trying is:

$cmd = "$folder" + "\myservice.exe" try {     & $cmd stop     & $cmd uninstall     & $cmd install     & $cmd start } catch {     write-host "error: update of service failed"     exit 1 } 

the start command fails following messge:

topshelf.hosts.starthost error: 0 : service failed start., system.invalidoperationexception: cannot start service myservice on computer '.'. ---> system.componentmodel.win32exception: service cannot started, either because disabled or because has no enabled devices associated     --- end of inner exception stack trace ---     @ system.serviceprocess.servicecontroller.start(string[] args)     @ system.serviceprocess.servicecontroller.start()     @ topshelf.runtime.windows.windowshostenvironment.startservice(string servicename)     @ topshelf.hosts.starthost.run() 

and never catch statement of powershell script.

update:

note asking how method catch statement , not solution actual exception. have solved actual exception want better feedback in future if fails, , want catch statement executed isn't in case of error.

try/catch in powershell doesn't work exe. after myservice.exe calls need check automatic variable $lastexitcode. try this:

$out = & $cmd start if ($lastexitcode -ne 0) # if exe returns 0 on success, if not change condition accordingly {     "error: $out"     return # exit script or else. }