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How to Validate an Argument Set


This example shows how to specify a validation rule that the Windows PowerShell runtime can use to check the parameter argument before the cmdlet is run. This validation rule provides a set of the valid values for the parameter argument.


For more information about the class that defines this attribute, see ValidateSetAttribute.

To validate an argument set

  • Add the ValidateSet attribute as shown in the following code. This example specifies a set of three possible values for the UserName parameter.

    [ValidateSet("Steve", "Mary", "Carl", IgnoreCase = true)]
    [Parameter(Position = 0, Mandatory = true)]
    public string UserName
      get { return userName; }
      set { userName = value; }
    private string userName;

For more information about how to declare this attribute, see ValidateSet Attribute Declaration.