function Test-MrParameterValidation { [CmdletBinding()] param ( [ValidateNotNullOrEmpty()] [string[]]$ComputerName = $env:COMPUTERNAME ) Write-Output $ComputerName } 详细输出 如果要编写复杂的代码,则内联注释非常有用,但除非用户查看代
[string] [SupportsWildcards] [switch] [timespan] [uint] [uint16] [uint32] [uint64] [ulong] [uri] [ushort] [ValidateCount] [ValidateDrive] [ValidateLength] [ValidateNotNull] [ValidateNotNullOrEmpty] [ValidateNotNullOrWhiteSpace] [ValidatePattern] ...
<logotest><extensions><e>.exe</e><e>.dll</e></extensions><files><f></f></files><dirs></dirs></logotest> 查询.exe 和 .dll结点 Powershell 默认支持的.NET类型如下。 [array],[bool],[byte],[char],[datetime],[decimal],[double],[guid],[hashtable],[int16],[int32],[int],[int...
If you want a function that can take pipeline input or input from a parameter, then theprocessblock needs to handle both cases. For example: PowerShell functionGet-SumOfNumbers{param( [int[]]$Numbers)begin{$retValue=0}process{if($null-ne$Numbers) {foreach($nin$Numbers) {$retValue+=$n...
This has significant implications for a function whose parameter has different meaning for$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...
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...
Example 4: Use Select-String in a function This example creates a function to search for a pattern in the PowerShell help files. For this example, the function only exists in the PowerShell session. When the PowerShell session is closed, the function is deleted. For more information, seeab...
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 msExchMailboxGUID Cant use dfsutil in ...
[Environment]::SetEnvironmentVariable("TestVariable",$null,"User") Again, if you use SetEnvironmentVariable the deleted variable might still show up when you call Get-ChildItem, at least until you restart. But take our word for it: the environment variable will no longer exist, as this comma...
Here’s a little holiday bonus for you: you can also create .ZIP files using NetCmdlets. For example, the following command grabs all the files in the folder C:\Scripts and adds them to a .ZIP file named C:\Test\Scripts.zip: