How to allow for starting using URI protocol activation?

[hansmbakker]

With URI protocol activation, the URI of the (custom) protocol will be passed as the first argument on the command line, like this:

myapp.exe myscheme://90413064-fa7f-4750-afa6-2f34047042ca

How can we best support this in parallel to supporting commands set using System.CommandLine, like

myapp.exe mycommand --myoption

https://docs.microsoft.com/en-us/windows/win32/shell/app-registration
https://blog.magnusmontin.net/2019/05/10/handle-protocol-activation-and-redirection-in-packaged-apps/

[jonsequitur]

Parsing this is fairly straightforward. Setting up your parser like this should work:

var uriArgument = new Argument<Uri>();
var myOption = new Option<int>("--myoption");
var myCommand = new Command("mycommand")
{
    myOption
};

var rootCommand = new RootCommand
{
    uriArgument,
    myCommand
};

rootCommand.SetHandler(uri => Console.WriteLine($"Received URI: {uri}"), uriArgument);

myCommand.SetHandler(i => Console.WriteLine($"Received option: {i}"), myOption);

rootCommand.Invoke("myscheme://90413064-fa7f-4750-afa6-2f34047042ca");
rootCommand.Invoke("mycommand --myoption 123");