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。 你可以使用单个对象,它应该...
[-TotalCount <System.Int32>] [<CommonParameters>] Get-Command [[-ArgumentList] <System.Object[]>] [-All] [-FullyQualifiedModule <Microsoft.PowerShell.Commands.ModuleSpecification[]>] [-ListImported] [-Module <System.String[]>] [-Noun <System.String[]>] [-ParameterName <System.String[]...
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 don't know how many to expect. For example:PowerShell Copy ...
$result -is [array] False Use the construct @() if you’d like to force a command to always return its result in an array. This way the command will always return an array, even if the command returns only one result or none at all. This way you find out the number of files in...
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To check this, I like to use the Measure-Command cmdlet. To ensure I have a large enough data set that will take a decent amount of time to sort, I create two random arrays by using the commands that are shown here. $arrayA = Get-Random -Count 1000000 -InputObject (1..1000000) ...
Incidentally, you can determine the number of items in an array simply by echoing back the value of theCountproperty, like so: $a.Count Oh, one more thing: what if you to get rid ofallthe items in the array? Here’s one thought; call theClearmethod: ...
$objCalendar.ShowTodayCircle = $False $objCalendar.MaxSelectionCount = 1 We set the ShowTodayCircle property to False for one simple reason: we don’t like the way the calendar looks when this value is True. (What difference does it make? Try the script with ShowTodayCircle set to $Fa...
(Get-History).Count To see the commands saved in your session history, use the Get-History cmdlet. For more information, see about_History. $OFS The Output Field Separator (OFS) specifies the character that separates the elements of an array that's converted to a string. Valid value...
But when the array$Colorsis expanded in the example, and Yellow becomes the predominant color, the construct must then check and dismiss the first three conditions in the script before the condition is of Yellow met: In this simple code block, swapping the position checks for Yellow and Green...