if($value-is[string] ) {# do something} 如果您正在處理類別或接受管線上的各種物件,您可以使用這。 您可以將服務或服務名稱作為輸入。 然後檢查您是否有服務,如果您只有名稱,則取得該服務。 PowerShell if($Service-isnot[System.ServiceProcess.ServiceController] ) {$Service=Get-Service-Name$Service} ...
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} ...
-cnotmatch (大文字と小文字が区別される正規表現不一致) -is (型) -is 演算子を使用して値の型を調べられます。 PowerShell コピー if ( $value -is [string] ) { # do something } これは、複数のクラスを使用している場合や、パイプライン上でさまざまなオブジェクトを受け入れている...
<string[]> -like <wildcard-expression> <string[]> -notlike <wildcard-expression> <string[]> -match <regular-expression> <string[]> -notmatch <regular-expression> 当这些运算符的输入是标量值时,它们返回布尔值。 当输入是值的集合时,集合中的每个项将转换为字符串以供比较。 -match 和-notmat...
所在位置行:1字符:13+MyScript.ps1<<<+CategoryInfo:ObjectNotFound:(MyScript.ps1:String)[],CommandNotFoundException+FullyQualifiedErrorId:CommandNotFoundExceptionSuggestion[3,General]:未找到命令MyScript.ps1,但它确实存在于当前位置。WindowsPowerShell默认情况下不从当前位置加载命令。如果信任此命令,请改为键入...
If you typeGet-SmallFileswithout a value, the function assigns 100 to$size. If you provide a value, the function uses that value. Optionally, you can provide a brief help string that describes the default value of your parameter, by adding thePSDefaultValueattribute to the description of your...
It returnsTrueif the variable is equal to$nullandFalseif the variable is not equal to$null. $str-eq$null Output: False We can use any of the methods above and easily determine whether a string variable is not null or empty in PowerShell....
As you can see, we’re simply taking $a and calling theCompareTomethod, passing the second string ($b) as the sole method parameter. If CompareTo returns a 0, that means the two strings are equal; anything other than a 0 means that the two strings are different. (Technically, a -1...
If you work with database types, you may get back a[dbnull]::Valuewhich is equivalent to$nullwithin the database, but in PowerShell, this was not equal to$nullso you can’t compare it directly. This change fromJoel Sallowallows you to compare both[dbnull]::Valueand[nullstring]::Valu...
bcdedit commands not working beginner issue with "unexpected token" error Best way to determine if all array elements are equal Best way to read the Certificate in powershell? Best way to run action again every minute, regardless of time taken to perform action Best Way to Run Powershell Scri...