PowerShell 复制 if ( $null -eq $array ) { 'Array actually is $null' } $null 数组与空数组不同。 如果知道有一个数组,请检查其中对象的计数。 如果数组为 $null,则计数为 0。PowerShell 复制 if ( $array.count -gt 0 ) { "Array isn't empty" } ...
PowerShell 複製 if ( $null -eq $array ) { 'Array actually is $null' } $null 陣列與空陣列不同。 如果您知道您有陣列,請檢查其中的物件計數。 如果陣列是 $null,則計數是 0。PowerShell 複製 if ( $array.Count -gt 0 ) { "Array isn't empty" } ...
18 $IsMacOS 判断是否运行在MacOS上 19 $null null 值 20 $PID 当前Powershell 进程 id 21 $PSItem 与变量$_等价,它在管道对象中包含当前对象 22 $PSHome widnows power shell安装目录完整路径 23 $PSVersionTable 当前会话中运行的power shell版本信息 24 $PWD 当前路径 25 $ShellId 当前shell的标识符 自...
You can use the array operator to create an array of zero or one object. For example:PowerShell Copy $a = @("Hello World") $a.Count Output Copy 1 PowerShell Copy $b = @() $b.Count Output Copy 0 The array operator is useful in scripts when you are getting objects, but ...
After all, trying to loop through something that isn’t an array will also result in an error: Copy x = 1 For Each y in x Wscript.Echo y Next In this case all we’re going to get back is the message “Object not a collection.” With Windows PowerShell it’s a different ...
這可能看起來像一個聰明的技巧,但我們有運算符-contains和-in處理這個更有效率。 做-notcontains你預期的事。 -包含 運算子-contains會檢查集合中的值。 一旦找到相符專案,就會傳$true回 。 PowerShell $array=1..6if($array-contains3) {# do something} ...
But if you need to determine whether a variable is $null, you must put $null on the left-hand side of the equality operator. Putting it on the right-hand side doesn't do what you expect. For example, let $a be an array containing null elements: PowerShell Copy $a = 1, 2...
I get that arrays are really simple in Windows PowerShell, but it seems that they are so simple that no one ever seems to tell us how to work with them. For example, I need to know how to add items to an array or how to change an item that is in an array. I have searched ...
($files -is [array]) { # 此种情况下,列出你想打开的文件: Write-Host -foregroundColor "Red" -backgroundColor "White" ` "你想打开这些文件吗?" foreach ($file in $files) { "- " + $file.Path } # 然后确认这些文件是否为用户想打开的: $yes = ([System.Management.Automation.Host.Choice...
It is not easy to delete elements from an array, but you can create a new array that contains only selected elements of an existing array. For example, to create the $t array with all elements in the $a array, except for the value at index position 2, type: ...