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...
PowerShell 複製 if ( $array.count -gt 0 ) { "Array isn't empty" } 還有一個陷阱可以注意這裡。 即使您有單一物件,也可以使用 count ,除非該物件是 PSCustomObject。 這是 PowerShell 6.1 中修正的錯誤。這是好消息,但很多人仍然在5.1,需要注意它。PowerShell 複製 ...
Count or Length or LongLengthIn PowerShell, arrays have three properties that indicate the number of items contained in the array.Count - This property is the most commonly used property to determine the number of items in any collection, not just an array. It's an [Int32] type value. ...
首选项变量:首选项变量存储 PowerShell 的用户首选项。 这些变量由 PowerShell 创建,并使用默认值填充。 用户可以更改这些变量的值。 例如,$MaximumHistoryCount变量确定会话历史记录中的最大条目数。 有关详细信息、列表和首选项变量的说明,请参阅about_Preference_Variables。
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: ...
However, in PowerShell, there are additional behaviors. Grouping result expressions (...)allows you to let output from acommandparticipate in an expression. For example: PowerShell PS> (Get-Item*.txt).Count-gt10True Piping grouped expressions ...
Removing Items From Arrays The String’s the Thing Three Things You Might Not Know About Windows PowerShell Functions Using Windows PowerShell “Here-Strings” Using the Range Operator in Wildcard Queries What Is (and What Isn’t) in Our Array? Windows PowerShell Tip: Adding a Simple Menu ...
( begin) : Count = 0; val = 5 (process) : Count = 1; val = 5; $_ = 1 (process) : Count = 2; val = 5; $_ = 2 (process) : Count = 3; val = 5; $_ = 3 ( end) : Count = 3; val = 5 有一类script和function用在pipeline里面对输入的对象进行逐一处理。
1000 items$counter = 0while ($counter -lt $data.Count) { # determine the amount of rows to process $maxRows = [math]::Min(1000, $data.Count - $counter) # loop through the data array using indexing in batches of $maxRows size for ($index = 0; $index -lt $maxRows; $index++) ...
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