ConsoleCommandErrorEvent

The failure passed to CommandFailed when a command throws. The dispatcher has already logged the exception by the time this is raised, so a subscriber adds to the report rather than replacing it.

Usage

using Microsoft.Extensions.Hosting;
using AlmightyShogun.ConsoleCommands;

public sealed class CommandFailureReporter(
    IConsoleCommandHandler commandHandler,
    IHostApplicationLifetime lifetime
) : IHostedService
{
    public Task StartAsync(CancellationToken cancellationToken)
    {
        commandHandler.CommandFailed += OnCommandFailed;

        return Task.CompletedTask;
    }

    public Task StopAsync(CancellationToken cancellationToken)
    {
        commandHandler.CommandFailed -= OnCommandFailed;

        return Task.CompletedTask;
    }

    private void OnCommandFailed(
        object? sender,
        ConsoleCommandErrorEvent args
    )
    {
        string command = args.CommandName;
        string message = args.Exception.Message;

        Console.Error.WriteLine($"{command} failed: {message}");

        lifetime.StopApplication();
    }
}

Fields

CommandName: string
The name as the user typed it, so a command reached through an alias reports the alias rather than its declared name.

Exception: Exception
The exception the command let escape, with its original stack trace rather than a reflection wrapper.

Type signature

public sealed class ConsoleCommandErrorEvent(
    string commandName,
    Exception exception
) : EventArgs