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 $null 時我是一個防禦腳本手。 每當我呼叫函式並將它指派給變數時,我...
ValidateNotNullAttribute:限制变量不能为空 ValidateNotNullOrEmptyAttribute:限制变量不等为空,不能为空字符串,不能为空集合 ValidatePatternAttribute:限制变量要满足制定的正则表达式 ValidateRangeAttribute:限制变量的取值范围 ValidateSetAttribute:限制变量的取值集合 ValidateNotNullAttribute 例子 ValidateNotNullOrEmptyAtt...
functionTest-MrParameterValidation{ [CmdletBinding()]param( [Parameter(Mandatory)] [string[]]$ComputerName)Write-Output$ComputerName} 如果没有指定ComputerName参数,也许要为其指定一个默认值。 问题是,默认值不能与强制性参数一起使用。 取而代之的是使用带有默认值的ValidateNotNullOrEmpty参数验证属性。
Now you might get a question, what if the $mystring has white space as value. It is neither a EMPTY value nor a NULL value so we can not use IsNullOrEmpty() method in this case. If you try it, it will return False which means string is not NULL or EMPTY. In such cases we can...
ValidateNotNullOrEmptyAttribute ValidateNotNullOrWhiteSpaceAttribute ValidatePatternAttribute ValidateRangeAttribute ValidateRangeKind ValidateScriptAttribute ValidateSetAttribute ValidateTrustedDataAttribute ValidateUserDriveAttribute ValidationMetadataException VariableAccessMode VariableBreakpoint VariablePath VerbInfo VerboseRec...
ValidateNotNullOrEmptyAttribute ValidateNotNullOrWhiteSpaceAttribute ValidatePatternAttribute ValidateRangeAttribute ValidateRangeKind ValidateScriptAttribute ValidateSetAttribute ValidateTrustedDataAttribute ValidateUserDriveAttribute ValidationMetadataException VariableAccessMode VariableBreakpoint VariablePath VerbInfo Verb...
that the parameter is not null or empty. This is necessary because it has already been defined as an attribute for the Parameter in PowerShell as part of the Stop-Service cmdlet source code.Executing VALIDATION metadata: [System.Management.Automation.ValidateNotNullOrEmptyA...
If this parameter is omitted from the command, or it value is$nullor an empty string, the workflow target is the local computer and Windows PowerShell remoting is not used to run the command. To use an IP address in the value of theComputerNameparameter, the command must include thePSCred...
can save the input as a secure string, you can use this cmdlet to prompt users for secure data, such as passwords, as well as shared data. @() Whether or not the result is an array depends on the number of results that were returned. If more than one, PowerShell returns an array....
($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 -...