PS> $empty = $null PS> $empty[0] Error: Cannot index into a null array. 因此,在尝试访问数组中的元素之前,请确保数组不是 $null。Count数组和其他集合具有计数属性,可告知数组中有多少项。PowerShell 复制 PS> $data.count 4 PowerShell 3.0 向大多数对象添加了计数属性
Count - This property is the most commonly used property to determine the number of items in any collection, not just an array. It's an [Int32] type value. In Windows PowerShell 5.1 (and older) Count alias property for Length. Length - This property is an [Int32] type value. This ...
PowerShell 複製 if ( $null -ne $value -and $value -ne 0 -and $value -ne '' -and ($value -isnot [array] -or $value.Length -ne 0) -and $value -ne $false ) { Do-Something } 只要您記得其他值算作$false,而不僅僅是變數具有值,使用基本if檢查就完全沒問題了。
if ( $null -ne $value -and $value -ne 0 -and $value -ne '' -and ($value -isnot [array] -or $value.Length -ne 0) -and $value -ne $false ) { Do-Something } 変数に値があるだけでなく、他の値が$falseとしてカウントされることを覚えている限り、基本的なifチェックを使用...
PS C:\> Get-LastModifiedFile -Path c:\scripts -filter *.xml -Interval Months -IntervalCount 6 Directory: C:\Scripts Mode LastWriteTime Length Name --- --- --- --- -a--- 8/31/2024 7:12 PM 17580 DefaultDomainPolicy.xml -a--- 8/31/2024 7:12 PM 17290 PKIAutoEnroll.xml -a-...
A set of PowerShell functions you might use to enhance your own functions and scripts or to facilitate working in the console. Most should work in both Windows PowerShell and PowerShell 7, even cross-platform. Any operating system limitations should be h
- --- --- --- True True Object[] System.Array PS>$list.Count20PS>$list= @(Get-Service|Where-ObjectStatus-EQStarting ) PS>$list.GetType() IsPublic IsSerial Name BaseType --- --- --- --- True True Object[] System.Array PS>$list.Count0 Hash table literal syntax@{} Similar to...
The Select-Object cmdlet selects specified properties of an object or set of objects. It can also select unique objects, a specified number of objects, or objects in a specified position in an array. To select objects from a collection, use the First, La
Another expensive operation is crawling an array to search a value: 复制 For ($i=0; $i -lt $array.count; $i++) { If ($array[$i] -eq $entry) { "We found $entry after $($i+1) iterations." $found = $true Break } } Instead, add the items to a hash...
$myArray=1,2,3$SingleArray= ,1Write-Output(,1) Write-Output需要参数,因此必须将表达式放在括号中。 点溯源运算符. 在当前作用域内运行脚本,以便脚本创建的任何函数、别名和变量都添加到当前作用域,从而重写现有内容。 脚本声明的参数将成为变量。 没有给定值的参数将成为没有值的变量。 但是,将保留自动变量...