How to add constraints to an int option? #905

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1. loudenvier

   changed the title [-]How to validate an int option?[/-] [+]How to add constraints to an int option?[/+] on Nov 2, 2023
2. ShadowXPA commented on Aug 19, 2025

   

   ShadowXPA

   on Aug 19, 2025

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   As per the wiki, the Min and Max only apply to IEnumerable.

   I agree, it's a pretty common scenario, and I tried doing the same you did.
   My work around is validating the options manually, and displaying an error message, along with the help text. It would be nice to have an option to add errors to the list of errors though, so it shows in the help text.

   I have this Extension method:

   public static HelpText AddErrors(this HelpText helpText, IEnumerable<string> errors)
   {
       helpText.AddPreOptionsLine("\nERROR(S):"); // Simulating the ERROR(S)'s header
       helpText.AddPreOptionsLines(errors); // You might want to format your errors by prefixing with 2 spaces to match the original
       return helpText;
   }
   

   Something like this would be nicer:

   var helpText = HelpText.AutoBuild(parserResult);
   helpText.AddErrorLine("Quality needs to be between 1 and 100.");
   // helpText.AddErrorLines(["", "", ...]);
   // helpText.AddErrorText("");
   Console.WriteLine(helpText);