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How to Validate an Argument Count

 

This example shows how to specify a validation rule that the Windows PowerShell runtime can use to check the number of arguments (the count) that a parameter accepts before the cmdlet is run. You set this validation rule by declaring the ValidateCount attribute.

System_CAPS_noteNote

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

To validate an argument count

  • Add the Validate attribute as shown in the following code. This example specifies that the parameter will accept one argument or as many as three arguments.

    [ValidateCount(1, 3)]
    [Parameter(Position = 0, Mandatory = true)]
    public string[] UserNames
    {
      get { return userNames; }
      set { userNames = value; }
    }
    
    private string[] userNames;
    

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

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