Display help when no option is specified

Issue by nicolasr75 Friday Feb 05, 2016 at 14:55 GMT _Originally opened as https://github.com/gsscoder/commandline/issues/286_

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Using version 2.0: When the user does not specify any option, I would like to display the same help screen that is automatically shown when the user specifies --help. I have a very simple program and would like to use as much default behavior as possible. I am using only a few options and this is the code I am using for parsing:

var parserResult = Parser.Default.ParseArguments<CommandlineOptions>(args)

if (parserResult.Tag == ParserResultType.Parsed)
{
    CommandlineOptions options = ((Parsed<CommandlineOptions>)parserResult).Value;

    if(options....)
    {

    }
    ...
    else  //no options specified
    {
        Console.WriteLine(CommandLine.Text.HelpText.AutoBuild(parserResult)); //***
    }       
}

However, the line marked with *** does not work because it expects a NotParsed instance. How could I generate the help output?

[moh-hassan]

Wiki with lot of examples

[moh-hassan]

Closed for age.