if 语句 比较运算符 集合运算符 显示另外 8 个 与许多其他语言一样,PowerShell 提供了用于在脚本中有条件地执行代码的语句。 其中一个语句是If语句。 今天,我们将深入探讨 PowerShell 中最基本的命令之一。 备注 本文的原始版本发布在@KevinMarquette撰写的博客上。 PowerShell 团队感谢 Kevin 与我们分享这篇文章。
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。 如果陣列為 $null,則計數為 0。PowerShell 複製 if ( $array.count -gt 0 ) { "Array isn't empty" } ...
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" } ...
$Methods=$_.getmethods() |Where-Object{$_.name-eq"tostring"} |%{"$_"}; If($methods-eq"System.String ToString(System.String)") { $_.fullname } } 输出: System.Enum System.DateTime System.Byte System.Convert System.Decimal System.Double System.Guid System.Int16 System.Int32 System.Int6...
The array sub-expression operator creates an array from the statements inside it. Whatever the statement inside the operator produces, the operator places it in an array. Even if there is zero or one object.The syntax of the array operator is as follows:...
Replace char[] array in CompletionRequiresQuotes with cached SearchValues (#24907) (Thanks @ArmaanMcleod!) Update IndexOfAny calls with invalid path/filename to SearchValues<char> for more efficient char searching (#24896) (Thanks @ArmaanMcleod!) Seal internal types in PlatformInvokes (#24826)...
-eq: This is the equality operator in PowerShell. It checks if the left-hand side (each element in $array) is equal to the right-hand side ($element). TheifCondition: The if statement evaluates the output of the Where-Object cmdlet. If Where-Object finds any elements in $array that ...
Here’s another nifty trick for quickly checking to see if any values exist in an array. Suppose we add the color black to our array:Copy $arrColors += "black" That means $arrColors now contains the following elements:Copy blue red green yellow white pink orange turquoise black That’...
If you’re an old hand at VBScript then you’ve come to look upon arrays with a certain feeling of dread. Why? Well, for one thing, you can’t just echo back the value of any array; that’s going to result in a “type mismatch” error. For example, take a look at the followin...
You aren't required to use any of these blocks in your functions. If you don't use a named block, then PowerShell puts the code in the end block of the function. However, if you use any of these named blocks, or define a dynamicparam block, you must put all code in a named blo...