Twilio.AspNet.Core 6.0.0-alpha2

Twilio helper library for ASP.NET

The Twilio helper library for ASP.NET (Twilio.AspNet), helps you integrate the official Twilio SDK for C# and .NET into your ASP.NET applications. The library supports ASP.NET MVC on .NET Framework and ASP.NET Core.

You only need this library if you wish to respond to Twilio webhooks for voice calls and SMS messages. If you only need to use the Twilio REST API's, then you only need the Twilio SDK for C# and .NET.

Twilio.AspNet.Core

Requirements

Requires .NET (Core) 2.0 or later.

Installation

Run the following command to install the package using the .NET CLI:

dotnet add package Twilio.AspNet.Core

Alternatively, from the Package Manager Console or Developer PowerShell, run the following command to install the latest version:

Install-Package Twilio.AspNet.Core

Alternatively, use the NuGet Package Manager for Visual Studio or the NuGet window for JetBrains Rider, then search for Twilio.AspNet.Core and install the package.

Twilio.AspNet.Mvc

Requirements

Requires .NET 4.6.2 or later.

Installation

From the Package Manager Console or Developer PowerShell, run the following command to install the latest version:

Install-Package Twilio.AspNet.Mvc

Alternatively, use the NuGet Package Manager for Visual Studio or the NuGet window for JetBrains Rider, then search for Twilio.AspNet.Mvc and install the package.

Code Samples for either Library

Incoming SMS

using Twilio.AspNet.Common;
using Twilio.AspNet.Core; // or .Mvc for .NET Framework
using Twilio.TwiML;

public class SmsController : TwilioController
{
    // GET: Sms
    public TwiMLResult Index(SmsRequest request)
    {
        var response = new MessagingResponse();
        response.Message(
            $"Hey there {request.From}! " +
            "How 'bout those Seahawks?"
        );
        return TwiML(response);
    }
}

This controller will handle the SMS webhook. The details of the incoming SMS will be bound to the SmsRequest request parameter. By inheriting from the TwilioController, you get access to the TwiML method which you can use to respond with TwiML.

Incoming Voice Call

using Twilio.AspNet.Common;
using Twilio.AspNet.Core; // or .Mvc for .NET Framework
using Twilio.TwiML;

public class VoiceController : TwilioController
{
    // GET: Voice
    public TwiMLResult Index(VoiceRequest request)
    {
        var response = new VoiceResponse();
        response.Say($"Welcome. Are you from {request.FromCity}?");
        return TwiML(response);
    }
}

This controller will handle the Voice webhook. The details of the incoming voice call will be bound to the VoiceRequest request parameter. By inheriting from the TwilioController, you get access to the TwiML method which you can use to respond with TwiML.

Using TwiML extension methods instead of inheriting from TwilioController

If you can't inherit from the TwilioController class, you can use the TwiML extension methods.

using Microsoft.AspNetCore.Mvc; // or System.Web.Mvc for .NET Framework
using Twilio.AspNet.Common;
using Twilio.AspNet.Core; // or .Mvc for .NET Framework
using Twilio.TwiML;

public class SmsController : Controller
{
    // GET: Sms
    public TwiMLResult Index(SmsRequest request)
    {
        var response = new MessagingResponse();
        response.Message(
            $"Hey there {request.From}! " +
            "How 'bout those Seahawks?"
        );
        return this.TwiML(response);
    }
}

This sample is the same as the previous SMS webhook sample, but instead of inheriting from TwilioController, the SmsController inherits from the ASP.NET MVC provided Controller, and uses this.TwiML to use the TwiML extension method.

Minimal API

Twilio.AspNet.Core also has support for Minimal APIs.

This sample shows you how you can hande an SMS webhook using HTTP GET and POST.

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

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

app.MapGet("/sms", ([FromQuery] string from) =>
{
    var response = new MessagingResponse();
    response.Message($"Ahoy {from}!");
    return Results.Extensions.TwiML(response);
});

app.MapPost("/sms", async (HttpRequest request) =>
{
    var form = await request.ReadFormAsync();
    var from = form["from"];
    response.Message($"Ahoy {from}!");
    return Results.Extensions.TwiML(response);
});

app.Run();

In traditional MVC controllers, the SmsRequest, VoiceRequest, and other typed request object would be bound, but Minimal APIs does not support the same model binding.

Instead, you can bind individual parameters for HTTP GET requests using the FromQuery attribute. When you don't specify the FromQuery attribute, multiple sources will be considered to bind from in addition to the query string parameters. For HTTP POST requests you can grab the form and then retrieve individual parameters by string index.
To respond with TwiML, use the Results.Extensions.TwiML method.

Model Bind webhook requests to typed .NET objects

Twilio.AspNet comes with multiple classes to help you bind the data from webhooks to strongly typed .NET objects. Here's the list of classes:

• SmsRequest: Holds data for incoming SMS webhook requests
• SmsStatusCallbackRequest: Holds data for tracking the delivery status of an outbound Twilio SMS or MMS
• StatusCallbackRequest: Holds data for tracking the status of an outbound Twilio Voice Call
• VoiceRequest: Holds data for incoming Voice Calls

Note: Only MVC Controllers and Razor Pages supports model binding to typed .NET objects. In Minimal APIs and other scenario's, you'll have to write code to extract the parameters yourself.

The following sample shows how to accept inbound SMS, respond, and track the status of the SMS response.

using Twilio.AspNet.Common;
using Twilio.AspNet.Core; // or .Mvc for .NET Framework
using Twilio.TwiML;

public class SmsController : TwilioController
{
    private readonly ILogger<SmsController> logger;

    public SmsController(ILogger<SmsController> logger)
    {
        this.logger = logger;
    }

    public TwiMLResult Index(SmsRequest request)
    {
        var messagingResponse = new MessagingResponse();
        messagingResponse.Message(
            body: $"Hey there {request.From}! How 'bout those Seahawks?",
            action: new Uri("/Sms/StatusCallback"),
            method: Twilio.Http.HttpMethod.Post
        );
        return TwiML(messagingResponse);
    }

    public void StatusCallback(SmsStatusCallbackRequest request)
    {
        logger.LogInformation("SMS Status: {Status}", request.MessageStatus);
    }
}

As shown in the sample above, you can add an SmsRequest as a parameter, and MVC will bind the object for you. The code then responds with an SMS with the status and method parameter. When the status of the SMS changes, Twilio will send an HTTP POST request to StatusCallback action. You can add an SmsStatusCallbackRequest as a parameter, and MVC will bind the object for you.