if($value-eq$null) {'The array is $null'}if($value-ne$null) {'The array is not $null'} 如果我未定义$value,则第一个的计算结果为$true,消息为The array is $null。 这里的陷阱是,可以创建一个允许二者都为$false的$value PowerShell ...
[ValidateNotNull] [ValidateNotNullOrEmpty] [ValidateNotNullOrWhiteSpace] [ValidatePattern] [ValidateRange] [ValidateScript] [ValidateSet] [ValidateTrustedData] [ValidateUserDrive] [version] [void] [WildcardPattern] [wmi] [wmiclass] [wmisearcher] ...
在以下示例中,ID 参数的值不能为 $null。PowerShell 复制 param( [Parameter()] [ValidateNotNull()] $ID ) ValidateNotNullOrEmpty 验证属性ValidateNotNullOrEmpty 属性指定分配的值不能为以下任何值:$null 空字符串 ("") 空数组 (@())如果值无效,PowerShell 会引发异常。PowerShell 复...
The argument is null or empty. Provide an argument that is not null or empty, and then try the command again. CannotConnect,PSSessionStateBroken Cant access a fileshare through a remote PS Session Cant make work with variable in Get-ADuser command to get UPN Cant return string for msExch...
Constructs an empty PowerShell instance; a script or command must be added before invoking this instance. Create(Runspace) Constructs an empty PowerShell instance and associates it with the provided Runspace; a script or command must be added before invoking this instance. Create(RunspaceMode) ...
functionGet-SmallFiles{param($Size)Get-ChildItem$HOME|Where-Object{$_.Length-lt$Size-and!$_.PSIsContainer } } In the function, you can use the$Sizevariable, which is the name defined for the parameter. To use this function, type the following command: ...
In PowerShell, the key to metaprogramming (or writing programs that write or manipulate other programs), is something called thescriptblock. This is a block of script code that exists as an object reference but does not require a name. The Where-Object and Foreach-Object Cmdlets rely on scr...
[ValidateNotNullOrEmpty()][int]$sleeptime, [parameter(Mandatory=$true)] [ValidateNotNullOrEmpty()][int]$cpu_set ) $count=0 while(1){ $count+=1 echo"Check CPU times :$count" if($(all_cpu)*100-gt$cpu_set){ echo"=== === Start Logging === ===">>C:\checkcpu_all_cpu.log ...
If Format is not specified, it is inferred from the file extension of ArchiveFileName (#24, proposed by @onyxhat) Added new parameter VolumeSize to specify the colume size for Compress-7Zip (#25, proposed by @rgel) Added new switches FlattenDirectoryStructure, SkipEmptyDirectories, and ...
The command will return True even if there are empty sub-folders. The default output is True or False but you can use -PassThru to get more information.PS C:\> Get-ChildItem c:\work -Directory | Test-EmptyFolder -PassThru | Where-Object {$_.IsEmpty} | Foreach-Object { Remove-Item...