if( (Get-Process)-and(Get-Service) ) 檢查$null 在if語句中,沒有任何結果或$null值會評估為$false。 檢查$null時,最佳做法是將$null放在左邊。 PowerShell if($null-eq$value) 在PowerShell 中處理$null值時,有相當多的細微差別。 如果您對深入潛水感興趣,我有一篇關於您
关于if/then/else 的各项须知内容 关于switch 的各项须知内容 关于异常的各项须知内容 关于$null 的各项须知内容 关于ShouldProcess 的各项须知内容 可视化参数绑定 多线程处理时的写入进度 向PowerShell 函数添加凭据支持 避免在表达式中分配变量 避免使用 Invoke-Expression ...
所在位置行:1字符:12+[fruit]$en=banana+~~~+CategoryInfo:ObjectNotFound:(banana:String)[],CommandNotFoundException+FullyQualifiedErrorId:CommandNotFoundException#当尝试使用非枚举值进行赋值时PSD:/>[fruit]$en=[fruit]::peach由于枚举值无效,无法将Null转换为类型“fruit”。请指定以下枚举值之一,然后重试。...
If you want a function that can take pipeline input or input from a parameter, then theprocessblock needs to handle both cases. For example: PowerShell functionGet-SumOfNumbers{param( [int[]]$Numbers)begin{$retValue=0}process{if($null-ne$Numbers) {foreach($nin$Numbers) {$retValue+=$n...
Use comparison operators (-eq,-ne,-gt,-lt,-le,-ge) to compare values and test conditions. For example, you can compare two string values to determine whether they're equal. The comparison operators also include operators that find or replace patterns in text. The (-match,-notmatch,-repla...
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The value of this parameter must be less than or equal to the value of the RecoverableItemsQuota parameter. When the UseDatabaseQuotaDefaults parameter on the mailbox is set to the value $true (the default value), the value of the this parameter is ignored, and the mailbox uses the Cale...
# Retrieve the first set of numbers less than or equal to 10. (1..50).Where({$_ -gt 10}, 'Until') # This would perform the same operation. (1..50).Where({$_ -le 10}) Output Kopyala 1 2 3 4 5 6 7 8 9 10 Not SkipUntil Hem hem de Until bir grup öğeyi TEST ...
If you work with database types, you may get back a[dbnull]::Valuewhich is equivalent to$nullwithin the database, but in PowerShell, this was not equal to$nullso you can’t compare it directly. This change fromJoel Sallowallows you to compare both[dbnull]::Valueand[nullstring]::Valu...
The value must be greater than or equal to the ProhibitSendQuota or IssueWarningQuota values. This setting applies to all mailboxes in the database that don't have their own prohibit send receive quota configured. The default value is 2.99804 gigabytes (2469396480 bytes) Expand table Type: ...