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
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...
說明 類型: String <empty string> 此課程模組所提供的功能描述。 範例:Description = 'This is the module's description.' PowerShellVersion 類型: Version <empty string> 本課程模組所需的PowerShell引擎最低版本。 有效值為 1.0、2.0、3.0、4.0、5.0、5.1、6.0、6.1、6.2、7.0 和 7.1。 範例...
[-Tail <Int32>] [-Path] <String[]> [-Filter <String>] [-Include <String[]>] [-Exclude <String[]>] [-Force] [-Credential <PSCredential>] [-Delimiter <String>] [-Wait] [-Raw] [-Encoding <Encoding>] [-AsByteStream] [-Stream <String>] [<CommonParameters>] 三、参数详解 -ReadCo...
$string="Hello World" The following example checks if a$stringvariable is null or not in PowerShell. It returns the first statement if the variable is not null or empty and the second statement if the variable is null or empty. if($string) {Write-Host"The variable is not null."}else...
Constructs an empty PowerShell instance; a script or command must be added before invoking this instance. CreateNestedPowerShell() Creates a nested powershell within the current instance. Nested PowerShell is used to do simple operations like checking state of a variable while another command is...
新增-NoEmphasize 參數以 Select-String 輸出 (#8963) (感謝 @derek-xia!) 重新新增 Get-HotFix Cmdlet (#10740) 讓Add-Type 可用於裝載 PowerShell 的應用程式中 (#10587) 在LanguagePrimitives.IsNullLike () (#10781 中使用更有效率的評估順序,) (感謝 @vexx32!) ...
[string]$ComputerNmae) Write-Output$ComputerNmae} 如果需要参数有多个值,指定类型为string[] functionTest-MrParameterValidation { [CmdletBinding()]param( [Parameter(Mandatory)] [string[]]$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...
The following example demonstrates that there is no symbol on an American QWERTY keyboard that gets sorted after 'a'. It feeds a set containing all such symbols to the -gt operator to compare them against 'a'. The output is an empty array. PowerShell Copy $a=' ','`','~','!...
param( [Parameter(Mandatory)] [AllowEmptyString()] [string]$ComputerName ) AllowEmptyCollection 验证属性AllowEmptyCollection 属性允许强制参数的值为空集合 @()。 以下示例声明一个可以具有空集合值的 ComputerName 参数。PowerShell 复制 param( [Parameter(Mandatory)] [AllowEmptyCollection()...