Define a function<\/strong><\/p>\n Note: above function prints ‘You set MyParameter to 10’<\/em><\/p>\n Cmdlet Bindings<\/strong><\/p>\n If the required parameter is not set when calling, the function Note: On my system, I did not get errors if I did not pass in the desired parameter. Instead, the parameter is set to Null and the script executes as expected with $CountDown == NULL<\/em><\/p>\n Throw<\/p>\n Command sends an error to the OS.<\/p>\n Try – Catch<\/strong><\/p>\n How to handle errors. This should crash because we’re not setting any parameters<\/p>\n <\/p>\n","protected":false},"excerpt":{"rendered":" Functions Define a function function myFunction { param( #define parameters $MyParameter ) # Do some stuff Write-Host “You set MyParameter to” $MyParameter } myFunction -MyParameter 10 Note: above function prints ‘You set MyParameter to 10’ Cmdlet Bindings If the required parameter is not set when calling, the function will might fail. You can avoid this ..<\/p>\nfunction myFunction { \r\n param(\r\n #define parameters\r\n $MyParameter\r\n )\r\n # Do some stuff\r\n Write-Host \"You set MyParameter to\" $MyParameter\r\n}\r\nmyFunction -MyParameter 10<\/pre>\nwill<\/del> might fail. You can avoid this with the following:<\/p>\nfunction myFunction { \r\n [CmdletBinding()]\r\n param(\r\n [Parameter(Mandatory)]\r\n [int32]$MyParameter\r\n )\r\n Write-Host \"You set MyParameter to\" $MyParameter\r\n}\r\nmyFunction\r\n\r\n... run\r\nC:> myFunction.ps1\r\ncmdlet myFunction at command pipeline position 1\r\nSupply values for the following parmeters:\r\nMyParameter: _ #<- waiting for a value.<\/pre>\nExceptions<\/h1>\n
C:> Throw \"It's a trap!\"\r\nIt's a trap!\r\nAt line:1 char:1\r\n+ throw \"It's a trap!\"\r\n+ ~~~~~~~~~~~~~~~~~~~~\r\n + CategoryInfo : OperationStopped: (It's a trap!:String) [], RuntimeException\r\n + FullyQualifiedErrorId : It's a trap!<\/pre>\n
function SpaceX{\r\n param(\r\n $CountDown\r\n )\r\n While ($CountDown -ge 1){\r\n Write-Host $CountDown \"Seconds to blastoff!\"\r\n }\r\n Write-Host \"Blastoff!!\"\r\n}\r\ntry { \r\n SpaceX -ErrorAction Stop \r\n} catch {\r\n Write-Output \"Launch Problem!\" Write-Output $_\r\n}<\/pre>\n