可以通过对变量使用 GetType() 方法来验证变量是否为数组。 列出的 BaseType 将为 System.Array。 可以在准备好将内容放入空数组之前创建空数组。 稍后在脚本中有一个向数组添加项的循环时,这会很有用。 例如: PowerShell $newUsers= @() 还可以在向变量添加单个值时强制创建数组。 这将创建一...
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...
However, the row // number may not match as the row numbers only get incremented based // on the number of rows if (PathIsDrive(path)) { if (String.Equals(type, "table", StringComparison.OrdinalIgnoreCase)) { // Execute command using ODBC connection to create a table try { // create...
Negative numbers count from the end of the array. For example, -1 refers to the last element of the array. To display the last three elements of the array, in index ascending order, type:PowerShell Copy $a = 0 .. 9 $a[-3..-1] Output Copy ...
v7.6.0-preview.2 Release of PowerShell Pre-release 7.6.0-preview.2 - 2025-01-14 General Cmdlet Updates and Fixes Add the AIShell module to telemetry collection list (#24747) Add helper in EnumSingleTypeConverter to get enum names as array (#17785) (Thanks @fflaten!) Return correct Fi...
Below is an example of this alternative syntax. PowerShell Copy function Add-Numbers([int]$One, [int]$Two) { $One + $Two } While the first method is preferred, there is no difference between these two methods. When you run the function, the value you supply for a parameter is ass...
TheContextparameter doesn't change the number of objects generated bySelect-String.Select-Stringgenerates oneMatchInfoobject for each match. The context is stored as an array of strings in theContextproperty of the object. When the output of aSelect-Stringcommand is sent down the pipeline to anot...
PowerShell. For example, suppose all you need is a process-level environment variable (that is, an environment variable that is only visible to, and lasts only as long as, your current PowerShell session). In that case you can create the new environment variable using code similar to this...
When we run this script, PowerShell will evaluate all the items in the array $a to see if any of them meet the specified condition. For example, the first condition says, “If $a is equal to 1 then the color is red.” PowerShell will examine all three of the values in $a – 21...
For primitive variable types, the value is displayed directly, typically as numbers, strings, and Booleans. For non-primitive variables, the type information is displayed. If the type is a collection or an array, the number of elements is displayed as well. ...