Checking if a string is NULL or EMPTY is very common requirement in Powershell script. If we don’t do that we will end up with run time errors if we try to perform some operation on that string variable which i
string to System.Management.Automation.ScriptBlock Cannot use Set-Acl properly despite being file owner and being a member of Administrators Group. Cannot validate argument on parameter 'Name'. The argument is null or empty. Provide an argument that is not null or empty, and then try the ...
IsNotNullOrEmpty如果值是字串,您可以使用靜態字串函式來檢查值是否為 $null 或同時為空字串。PowerShell 複製 if ( -not [string]::IsNullOrEmpty( $value ) ){...} 當我知道實值類型應該是字串時,我經常會使用這個 。當我檢查 $null 時我是一個防禦腳本手。 每當我呼叫函式並將它指派給變數時,我...
function Test-MrParameterValidation { [CmdletBinding()] param ( [ValidateNotNullOrEmpty()] [string[]]$ComputerName = $env:COMPUTERNAME ) Write-Output $ComputerName } 详细输出 如果要编写复杂的代码,则内联注释非常有用,但除非用户查看代码,否则不会看到它们。 以下示例中的函数在 foreach 循环内有一...
特性的值HelpMessage不应为空字符串或 null 值,因为这会导致 PowerShell 解释器在执行函数或 cmdlet 时引发错误。 方式 指定HelpMessage属性的值。 示例 错 PowerShell FunctionBadFuncEmptyHelpMessageEmpty {Param( [Parameter(HelpMessage='')] [String]$Param)$Param}FunctionBadFuncEmptyHelpMessage...
ValidateNotNullOrEmptyAttribute:限制变量不等为空,不能为空字符串,不能为空集合 ValidatePatternAttribute:限制变量要满足制定的正则表达式 ValidateRangeAttribute:限制变量的取值范围 ValidateSetAttribute:限制变量的取值集合 ValidateNotNullAttribute 例子 ValidateNotNullOrEmptyAttribute 例子,注意@()为一个空数组。
AllowEmptyStringAttribute AllowNullAttribute ApplicationFailedException ApplicationInfo ArgumentCompleterAttribute ArgumentCompleterFactoryAttribute ArgumentCompletionsAttribute ArgumentTransformationAttribute ArgumentTransformationMetadataException AuthorizationManager BreakException Breakpoint BreakpointUpdatedEventArgs BreakpointUpdateTy...
Optionally, you can provide a brief help string that describes the default value of your parameter, by adding thePSDefaultValueattribute to the description of your parameter, and specifying theHelpproperty ofPSDefaultValue. To provide a help string that describes the default value (100) of theSize...
I disagree. Allowing[NullString]::Valueto propagate without conversion to[string]::emptyis useful when optional string parameters are handled in bulk using eitherValueFromPipelineByPropertyNameor via hashtable splatting. Here is an example using the former demonstrating parameter passing that arises na...
($v) # Adding ValidateNotNullOrEmpty parameter validation $v = New-Object System.Management.Automation.ValidateNotNullOrEmptyAttribute $AttributeCollection.Add($v) $attributeCollection.Add($attributes) # Adding a parameter alias $dynalias = New-Object System.Management.Automation.AliasAttribute -...