IsNotNullOrEmpty如果值是字串,您可以使用靜態字串函式來檢查值是否為 $null 或同時為空字串。PowerShell 複製 if ( -not [string]::IsNullOrEmpty( $value ) ){...} 當我知道實值類型應該是字串時,我經常會使用這個 。當我檢查 $null 時我是一個防禦腳本手。 每當我呼叫函式並將它指派給變數時,我...
Checking if a string is NULL or EMPTY is very common requirement in Powershell script. If we don’t do that we will end up with run time errors if we try to perform some operation on that string variable which is empty or null. So the question now is, how to check it? Well, belo...
[string[]]$ComputerName) Write-Output$ComputerName} 如果需要指定一个默认参数需要将ValidateNotNullOrEmpty参数验证属性与默认值一起使用,不过不能与必需(Mandatory)参数一起使用! functionTest-MrParameterValidation { [CmdletBinding()]param( [ValidateNotNullOrEmpty()] [string[]]$ComputerNmae="s1") Write-...
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。
IsNotNullOrEmpty<T>(IList<T>) Method Reference Feedback Definition Namespace: Microsoft.Azure.PowerShell.Cmdlets.CosmosDB.Models Assembly: Microsoft.Azure.PowerShell.Cmdlets.CosmosDB.dll C# 复制 public static bool IsNotNullOrEmpty<T> (System.Collections.Generic.IList<T> ...
Commands Gets or sets current powershell command line. HadErrors 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...
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...
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 argument whose value is null encounters a function parameter that is statically typed as[string], PowerShell unexpectedly converts it to[string]::empty. That has the effect of implicitly converting all string parameters not mentioned in the configuration from$null"don't make a change" to...
[ValidateNotNullorEmpty()] [System.String]$ServerName, [System.String]$DomainName, [System.String]$CARootName, [System.String]$CAServerFQDN, [System.String]$CertSubject, [System.String]$SMBShare, [Parameter(Mandatory=$true)] [ValidateNotNullorEmpty()] [PsCredential]$Credential) Configuration ...