if($null-ne$path-and(Test-Path-Path$path) ) -或 -or可讓您指定兩個表達式,並在其中一個表達式$true時傳回$true。 PowerShell if($age-le13-or$age-ge55) 就像-and運算符一樣,評估會從左到右進行。 如果第一個部分是$true,那麼整個語句就是$true,並且不會處理表達式的其餘部分。
下面是if语句的基本示例: PowerShell $condition=$trueif($condition) {Write-Output"The condition was true"} if语句执行的第一步是计算括号中的表达式。 如果计算结果为$true,则执行大括号中的scriptblock。 如果值为$false,则会跳过该脚本块。 在上面的示例中,if语句仅计算$condition变量。 其计算结果为$true...
ValidateNotNullAttribute:限制变量不能为空 ValidateNotNullOrEmptyAttribute:限制变量不等为空,不能为空字符串,不能为空集合 ValidatePatternAttribute:限制变量要满足制定的正则表达式 ValidateRangeAttribute:限制变量的取值范围 ValidateSetAttribute:限制变量的取值集合 ValidateNotNullAttribute 例子 ValidateNotNullOrEmptyAtt...
Now starting from the standard default state, which will have an empty results listbox, test automation might determine that the Web app works correctly and not reveal the bug. But if you start the automation from a state that already contains some results in the listbox, the new...
functionFind-LocalRoleCapability{$results= @()# Find modules with a "RoleCapabilities" subfolder and add any PSRC files to the result setGet-Module-ListAvailable|ForEach-Object{$psrcpath=Join-Path-Path$_.ModuleBase-ChildPath'RoleCapabilities'if(Test-Path$psrcpath) {$results+=Get-ChildItem-Pa...
Also, whenSimpleMatchis used, theMatchesproperty of theMatchInfoobject returned is empty. Note When this parameter is used with theAllMatchesparameter, theAllMatchesis ignored. Type:SwitchParameter Position:Named Default value:False Required:False ...
The string can be interpreted as True if it's converted to a non-empty string or to a non-zero integer. $foreach Contains the enumerator (not the resulting values) of a foreach loop. The $foreach variable exists only while the foreach loop is running; it's deleted after the loop...
Again, if TestVariable does not exist PowerShell will create the new environment variable for us. If TestVariabledoesexist, then PowerShell will assign it the valueTest value. One thing to watch out for: when we used SetEnvironmentVariable to create a new user- or machine-level environment ...
Test-NetConnection We feel like a kid in a candy store. Or at least a kid in a candy store that also sells PowerShell cmdlets. PowerTab And then there was: PowerTab. As you probably know, out of the box Windows PowerShell includes some basictab expansion. (OK, “out of the box”...
This has significant implications for a function whose parameter has different meaning for$nullversus[string]::empty. In DSC resources, for example, it is natural to pass groups of parameters from the Set and Test functions down through a call stack which eventually makes a system call to manip...