Checking if a string is NULL or EMPTY is very common requirement in Powershell script. If we don’t do that we will end up with run time errors if we try to perform some operation on that string variable which is empty or null. So the question now is, how to check it? Well, belo...
It returnsTrueif the string is empty andFalseif it is not empty. [string]::IsNullOrEmpty($new) Output: True Now, let’s assign a string value to a variable. $new="asdf"[string]::IsNullOrEmpty($new) Output: False You can also use theIsNullOrWhiteSpacemethod to check if a string variable...
[-ComputerName <System.String[]>] [-Credential <System.Management.Automation.PSCredential>] [<CommonParameters>] DESCRIPTION > This cmdlet is only available on the Windows platform. The `Get-HotFix` cmdlet uses the Win32_QuickFixEngineering WMI class to list hotfixes that are installed on the ...
functionTest-MrParameterValidation{ [CmdletBinding()]param( [Parameter(Mandatory)] [string[]]$ComputerName)Write-Output$ComputerName} 如果没有指定ComputerName参数,也许要为其指定一个默认值。 问题是,默认值不能与强制性参数一起使用。 取而代之的是使用带有默认值的ValidateNotNullOrEmpty参数验证属性。
+ CategoryInfo : ObjectNotFound: (pause:String) [], CommandNotFoundException + FullyQualifiedErrorId : CommandNotFoundException : The term '' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path ...
如果需要参数有多个值,指定类型为string[] functionTest-MrParameterValidation { [CmdletBinding()]param( [Parameter(Mandatory)] [string[]]$ComputerName) Write-Output$ComputerName} 如果需要指定一个默认参数需要将ValidateNotNullOrEmpty参数验证属性与默认值一起使用,不过不能与必需(Mandatory)参数一起使用!
check if object is $null Check if OS is 32bit or 64bit check If Process Is Running in another computer Check if SMB1 is enabled on the AD servers Check if string contains invalid characters Check if string starts with letter/character. check installed memory with physical memory Check networ...
First I check that a column contains an open bracket character ([). If it doesn’t, I can split the string at the colon character (:). If not then I need to split is at the string']:'and also trim off the opening bracket. ...
[ValidateNotNullorEmpty()] [System.String]$ServerName, [System.String]$DomainName, [System.String]$CARootName, [System.String]$CAServerFQDN, [System.String]$CertSubject, [System.String]$SMBShare, [Parameter(Mandatory=$true)] [ValidateNotNullorEmpty()] [PsCredential]$Credential) Configuration ...
Stringify ErrorRecord with empty exception message to empty string (#24949) (Thanks @MatejKafka!) Add completion single/double quote support for -PSEdition parameter for Get-Module (#24971) (Thanks @ArmaanMcleod!) Error when New-Item -Force is passed an invalid directory name (#24936) (Than...