示例Get-Proc cmdlet 将输入验证属性(System.Management.Automation.ValidateNotNullOrEmptyAttribute)添加到 Name 参数,以启用输入既不是 null 也不是空的验证。 此属性是 Windows PowerShell 提供的多个验证属性之一。 有关其他验证属性的示例,请参阅 验证参数输入。 复制 [Parameter(Position = 0)] ...
If you are developing .NET Core C# applications targeting PowerShell Core, check out our FAQ to learn more about the PowerShell SDK NuGet package. Also, make sure to check out our PowerShell-RFC repository for request-for-comments (RFC) documents to submit and give comments on proposed and...
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。
Cannot bind argument to parameter xxxxx' because it is an empty string. Cannot bind parameter 'Date' to the target Cannot convert 'System.Object[]' to the type 'System.Nullable'1[System.Boolean\' required by parameter 'Enabled' Cannot convert system.object to the type system collection idictio...
For string values, we can use two more methods i.e. IsNullorEmpty() and IsNullOrWhiteSpace() to check if variable is null. Let’s go through each of them: 6.1 Using IsNullorEmpty() IsNullorEmpty() checks if a string variable is either null or empty. It is efficient and more comprehensive...
public string Parameter1; [Parameter(Mandatory = true, ValueFromPipeline = true)] public string InputObject; protected override void ProcessRecord() { if ( Parameter1 != null ) { WriteObject(Parameter1 + ":" + InputObject); } else { ...
Add completion single/double quote support for -Noun parameter for Get-Command (#24977) (Thanks @ArmaanMcleod!) Stringify ErrorRecord with empty exception message to empty string (#24949) (Thanks @MatejKafka!) Add completion single/double quote support for -PSEdition parameter for Get-Module (...
ForEach(scriptblock expression, object[] arguments)This method was added in PowerShell v4.Note The syntax requires the usage of a script block. Parentheses are optional if the scriptblock is the only parameter. Also, there must not be a space between the method and the opening parenthesis ...
Verify that a password is set on the workgroup-based computer. If a password is not set or the password value is empty, you cannot run remote commands. Use theCredentialparameter in all remote commands. This is required even when you connect as the current user. ...
If a parameter accepts a PSCredential object, Windows PowerShell supports several types of input, such as the following: EmptyIf you supply no input to a mandatory –credential parameter, Windows PowerShell prompts you for the user name and password. ...