PowerShellHostName 類型: String <empty string> 本課程模組所需的PowerShell主機名稱。 此名稱是由PowerShell提供。 若要尋找主機程式的名稱,請在程式中輸入:$Host.Name。 範例:PowerShellHostName = 'ConsoleHost' PowerShellHostVersion 類型: Version
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...
除了Trim()函数,还可以使用TrimStart()函数和TrimEnd()函数分别删除字符串开头和结尾的空字符。 代码语言:txt 复制 $trimmedStartString = $originalString.TrimStart() $trimmedEndString = $originalString.TrimEnd() 这些函数可以帮助我们在PowerShell中处理字符串时避免空字符带来的问题,确保数据的准确性和一致性。
ComputerName Verbose Debug ErrorAction WarningAction InformationAction ErrorVariable WarningVariable InformationVariable OutVariable OutBuffer PipelineVariable WhatIf Confirm 参数验证 尽早验证输入。 如果没有有效输入则无法完成,不允许代码继续执行。 参数变量必须始终指定数据类型。 在下面的示例中,String 被指定为 ...
ParameterSetName 属性包含正在使用的参数集的名称,而 ShouldProcess 方法将 WhatIf 和Confirm 参数动态添加到 cmdlet。 有关$PSCmdlet 自动变量的详细信息,请参阅 about_Functions_Advanced。 $PsCulture 包含操作系统中当前所用的区域性的名称。区域性确定数字、货币和日期等项的显示格式。这是系 ...
[-Delimiter <String>] [-Wait] [-Raw] [-Encoding <Encoding>] [-AsByteStream] [-Stream <String>] [<CommonParameters>] 三、参数详解 -ReadCount:设置每次通过管道发送的内容行数。默认值为 1。 当值为0时一次发送所有文件内容。它的作用时影响显示内容所需要的时间,值越大第一行显示时间会变长,但合...
If an error occurred while executing the pipeline, this will be set to true. HistoryString The history string to be used for displaying the history. InstanceId Get unique id for this instance of runspace pool. It is primarily used for logging purposes. InvocationStateInfo Gets the execution...
If the function is invoked without pipeline input, PowerShell executes theprocessblock only once. Within a pipeline, theprocessblock executes once for each input object that reaches the function. If the pipeline input that reaches the function is empty, theprocessblock doesn't execute. ...
$string=""if($string) {Write-Host"The variable is not null."}else{Write-Host"The variable is null." } Output: The variable is null. White space characters are not considered null string values. Use theIsNullorEmptyMethod to Check if a String Variable Is Not Null or Empty in PowerShell...
function Get-Sample { [CmdletBinding()] param([string]$Name, [string]$Path) dynamicparam { if ($Path.StartsWith("HKLM:")) { $parameterAttribute = [System.Management.Automation.ParameterAttribute]@{ ParameterSetName = "ByRegistryPath" Mandatory = $false } $attributeCollection = [...