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After some recent discussions about the C# events their drawbacks, specifically with async callbacks, I prototyped a couple of alternative event APIs for a Speech-To-Text library that I'm working on.

Please let me know which one you prefer, or better alternatives. 🙇

Option 1

For each event, have an event object to which you can subscribe and unsubscribe.

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using Hangfire;

var builder = WebApplication.CreateBuilder(args);

builder.Services.AddHangfire(configuration => configuration
    .UseSimpleAssemblyNameTypeSerializer()
    .UseRecommendedSerializerSettings()
    .UseInMemoryStorage());

builder.Services.AddHangfireServer();

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private static void ChangeEmptyStringToNull(IConfigurationSection configSection)
{
    if (configSection == null) return;
    if (configSection.Value == "") configSection.Value = null;
    foreach (var childConfigSection in configSection.GetChildren())
    {
        ChangeEmptyStringToNull(childConfigSection);
    }
}

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{
  "description": "Send Message and Wait until Delivered",
  "states": [
    {
      "name": "Trigger",
      "type": "trigger",
      "transitions": [
        {
          "event": "incomingMessage"
        },

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using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Filters;
using Twilio.AspNet.Core;
using Twilio.TwiML;

namespace TwimlErrorMessageAttribute.Controllers;

[Route("twilio")]
public class TwilioController : Controller
{

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Fixing breaking changes in the TwiMLResult class for Twilio.AspNet v7 release

The v7 release removed the string and XDocument overload for the TwiMLResult constructor. One solution to this is to stop using string and XDocument and replace the code using the MessagingResponse and VoiceResponse classes, so you can keep using TwiMLResult. However, if you want to keep using string and XDocument, I'll share some before and after code for string and XDocument for both ASP.NET Core MVC and ASP.NET MVC on .NET Framework.

ASP.NET Core MVC

Before v7 using string:

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<?xml version="1.0" encoding="utf-8"?>
<RunSettings>
  <Playwright>
    <BrowserName>chromium</BrowserName>
    <ExpectTimeout>5000</ExpectTimeout>
    <LaunchOptions>
      <Headless>false</Headless>
      <Channel>msedge</Channel>
      <SlowMo>200</SlowMo>
    </LaunchOptions>

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$Items = bw list items | ConvertFrom-Json

Function Compare-Values($Name, $Item1, $Item2) {
    if ($Item1 -eq $Item2) {
        Write-Host "✅ $($Name): $Item1 =="
        return $true 
    }
    else {
        Write-Host "⚠️ $($Name): $Item1 <> $Item2";
        return $false 

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using Microsoft.AspNetCore.Mvc;
using Twilio.AspNet.Core.MinimalApi;
using Twilio.TwiML;

var builder = WebApplication.CreateBuilder(args);
var app = builder.Build();

app.MapGet("/", () => "Hello World!");

app.MapGet("/sms", ([FromQuery] string from, [FromQuery] string body) =>

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<SuffixedPageTitle>Home Page</SuffixedPageTitle>