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 i
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...
function Test-MrParameterValidation { [CmdletBinding()] param ( [ValidateNotNullOrEmpty()] [string[]]$ComputerName = $env:COMPUTERNAME ) Write-Output $ComputerName } 详细输出 如果要编写复杂的代码,则内联注释非常有用,但除非用户查看代码,否则不会看到它们。 以下示例中的函数在 foreach 循环内有一...
[-ComputerName <System.String[]>] [-Credential <System.Management.Automation.PSCredential>] [<CommonParameters>] DESCRIPTION > This cmdlet is only available on the Windows platform. The `Get-HotFix` cmdlet uses the Win32_QuickFixEngineering WMI class to list hotfixes that are installed on the ...
如果需要参数有多个值,指定类型为string[] functionTest-MrParameterValidation { [CmdletBinding()]param( [Parameter(Mandatory)] [string[]]$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 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 network drive connection Chec...
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...
runspace.Open(); //Create an empty pipeline using (Pipeline pipeline = runspace.CreatePipeline()) { //Commands--获取此管道的命令集合 //AddScript(String) Adds a new script command 添加一个新的脚本命令 pipeline.Commands.AddScript(command); //合并此命令结果 //myResult:PipelineResultTypes:要重定...
(&) is used to indicate the “accelerator key” for this option. By placing the ampersand before the letterYwe’re giving the user two ways to select this option: typeYesand press ENTER; or typeYand press ENTER. What if we wanted to give the user the option of typing the letterSand...
So what else do people do with string values? Well, one very common task is determining whether or not a given substring can be found anywhere within that value. For example, suppose you need to know if the stringriptappears anywhere in the value of $a (which, as you might recall, is...