以下示例检查$string变量在PowerShell中是否为NULL。如果变量不为NULL或空,则返回第一个语句,如果变量为NULL或空,则返回第二个语句。 if($string){Write-Host"The variable is not null."}else{Write-Host"The variable is null."} 输出: The variable is not null. 让我们为变量分配一个空字符串值并再次检...
if语句最常见的用法是比较两个项。 PowerShell 具有特殊运算符,可用于不同的比较方案。 当使用比较运算符时,会将左右两侧的值进行比较。 -eq(等于) -eq在两个值之间执行相等检查,以确保它们彼此相等。 PowerShell $value=Get-MysteryValueif(5-eq$value) {# do something} ...
PowerShell 複製 if ( $null -ne $value -and $value -ne 0 -and $value -ne '' -and ($value -isnot [array] -or $value.Length -ne 0) -and $value -ne $false ) { Do-Something } 只要您記得其他值算作$false,而不僅僅是變數具有值,使用基本if檢查就完全沒問題了。
if ( $value -eq $null ) { 'The array is $null' } if ( $value -ne $null ) { 'The array is not $null' } 私が$valueを定義しない場合、最初の1つは $true に評価され、メッセージは The array is $null。 落とし穴になるのは、どちらも $false となるような $value を作成で...
I assume that hitting enter would leave the variable blank and thus null. I narrowed it down to it failing at the else because it is expecting a subsite which there is not one. So it is basically ignoring the null code. if I put something in the subsite and dept then the ELSE ...
WhatIfPreference False 查看变量类型 变量可以自动存储任何PowerShell能够识别的类型信息,可以通过$变量名.GetType()查看和验证PowerShell分配给变量的数据类型 PSC:/>$num=10PSC:/>$num.gettype()#方法不区分大小写IsPublicIsSerialNameBaseType---TrueTrueInt32System.ValueType 删除变量 如果不想继续使用自定义的变量...
In PowerShell, checking if a variable is null (or in PowerShell terms, $null) is a fundamental task in scripting, especially when dealing with the output of
powerline 字体letg:airline#extensions#tabline#enabled=1""显示窗口tab和buffer"let g:airline_theme='moloai' "murmur配色不错if!exists('g:airline_symbols')letg:airline_symbols={}endifletg:airline_left_sep='▶'letg:airline_left_alt_sep='❯'letg:airline_right_sep='◀'letg:airline_right_alt...
$i = 0 foreach ($num in ("one","two","three")) { "Iteration: $i" $i++ "`tNum: $num" "`tCurrent: $($foreach.Current)" if ($foreach.Current -eq "two") { "Before MoveNext (Current): $($foreach.Current)" $foreach.MoveNext() | Out-Null "After MoveNext (Current): $...
not the name>"$resourceGroupName="<Replace with your Resource Group Name>"$asaJobName="<Replace with your Stream Analytics job name>"$resourceId="/subscriptions/$($subscriptionId)/resourceGroups/$($resourceGroupName)/providers/Microsoft.StreamAnalytics/streamingjobs/$($asaJobName)"# If not ...