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How to Validate the Argument Length


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


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

To validate the argument length

  • Add the Validate attribute as shown in the following code. This example specifies that the length of the argument should have a length of 0 to 10 characters.

    [ValidateLength(0, 10)]
    [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 ValidateLength Attribute Declaration.