Is there a way to have more than eight options?

[ToddRopog]

Right now SetHandler only supports up to eight options. Is there a way to exceed this limit? Or will it be increased in the future?

[KalleOlaviNiemitalo]

In 2.0.0-beta4.22272.1, use an overload that gives the InvocationContext to the handler:

command-line-api/src/System.CommandLine/Handler.Action.cs

Lines 14 to 20 in 209b724

	/// <summary>
	/// Sets a command's handler based on an <see cref="Action{InvocationContext}"/>.
	/// </summary>
	public static void SetHandler(
	this Command command,
	Action<InvocationContext> handle) =>
	command.Handler = new AnonymousCommandHandler(handle);

command-line-api/src/System.CommandLine/Handler.Func.cs

Lines 23 to 29 in 209b724

	/// <summary>
	/// Sets a command's handler based on a <see cref="Func{Task,InvocationContext}"/>.
	/// </summary>
	public static void SetHandler(
	this Command command,
	Func<InvocationContext, Task> handle) =>
	command.Handler = new AnonymousCommandHandler(handle);

Then make the handler read InvocationContext.ParseResult

command-line-api/src/System.CommandLine/Invocation/InvocationContext.cs

Lines 81 to 84 in 209b724

	/// <summary>
	/// The parse result for the current invocation.
	/// </summary>
	public ParseResult ParseResult { get; set; }

and query the values from the ParseResult:

command-line-api/src/System.CommandLine/Parsing/ParseResult.cs

Lines 162 to 168 in 209b724

	/// <inheritdoc cref="GetValueForArgument"/>
	public T GetValueForArgument<T>(Argument<T> argument)
	=> RootCommandResult.GetValueForArgument(argument);
	/// <inheritdoc cref="GetValueForOption"/>
	public T? GetValueForOption<T>(Option<T> option)
	=> RootCommandResult.GetValueForOption(option);

In later versions of System.CommandLine (which are not yet at nuget.org), the SetHandler overloads that take IValueDescriptor<T> parameters have already been deleted, but the InvocationContext approach is still available (although the type isn't called InvocationContext any more).