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Viewing file: Select action/file-type: TOPIC about_Functions_CmdletBindingAttribute SHORT DESCRIPTION Describes an attribute that declares a function that acts similar to a compiled cmdlet. LONG DESCRIPTION When you write functions, you can add the CmdletBinding attribute so that Windows PowerShell will bind the parameters of the function in the same way that it binds the parameters of compiled cmdlets. When this attribute is declared, Windows PowerShell also sets the $PSCmdlet automatic variable. When you use cmdlet binding, unknown parameters and positional arguments that have no matching positional parameters cause parameter binding to fail. Also, a function or script with cmdlet binding does not use the $args variable. Note: Compiled cmdlets use the required Cmdlet attribute, which is similar to the CmdletBinding attribute that is described in this topic. The following example shows the outline of a function that specifies all the optional arguments of the CmdletBinding attribute. A brief description of each argument follows this example. { [CmdletBinding(SupportsShouldProcess=<Boolean>, ConfirmImpact=<String>, DefaultParameterSetName=<String>)] Param ($Parameter1) Begin{} Process{} End{} } SupportsShouldProcess When the SupportsShouldProcess argument is set to true, it indicates that the function supports calls to the ShouldProcess method, which is used to prompt the user for feedback before the function makes a change to the system. When this argument is specified, the Confirm and WhatIf parameters are enabled for the function. For more information about confirmation requests, see "Requesting Confirmation" in the MSDN (Microsoft Developer Network) library at http://go.microsoft.com/fwlink/?LinkId=136658. DefaultParameterSetName The DefaultParameterSetName argument specifies the name of the parameter set that Windows PowerShell will attempt to use when it cannot determine which parameter set to use. You can avoid this issue by making the unique parameter of each parameter set a mandatory parameter. ConfirmImpact The ConfirmImpact argument specifies when the action of the function should be confirmed by a call to the ShouldProcess method. The call to the ShouldProcess method displays a confirmation prompt only when the ConfirmImpact argument is equal to or greater than the value of the $ConfirmPreference preference variable. (The default value of the argument is Medium.) Specify this argument only when the SupportsShouldProcess argument is also specified. SEE ALSO about_Functions_Advanced about_Functions_CmdletBindingAttribute about_Functions_ParameterAttributes |
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