Invoking the following program with no arguments:

using System.CommandLine; using System.CommandLine.Builder; using System.CommandLine.Parsing; internal static class Program { //private static Task<int> Main(string[] args) => // new CommandLineBuilder(CreateRootCommand()) // .Build() // .InvokeAsync(args); private static Task<int> Main(string[] args) => CreateRootCommand().InvokeAsync(args); private static Command CreateRootCommand() { var rootCommand = new RootCommand("Specifying a sub-command is required."); var fooCommand = new Command("foo"); rootCommand.Add(fooCommand); return rootCommand; } }

results in a red error message that says "Required command was not provided." followed by the program help text, and the program returns an error exit code.

However, if I replace the Main method above with the commented-out Main method and invoke the program with no arguments, then nothing appears and the program returns a successful exit code.

Is this discrepancy intentional? If so, how do I make the CommandLineBuilder version behave the same as the non-CommandLineBuilder version?

This is using System.CommandLine 2.0.0-beta4.22272.1

Thanks!