Programmable SMS Quickstart for C# with .NET Core

With just a few lines of code, your .NET Core application can send and receive text messages with Twilio Programmable SMS.

This C# SMS Quickstart will teach you how to do this using our Communications REST API and the Twilio helper library for .NET Core.

このクイックスタートでは、下記のことを学んでいきます:

1. Twilioにサインアップして、SMS機能を持ったはじめてのTwilio電話番号を入手する
2. メッセージを送受信できるように開発環境をセットアップする
3. 最初のSMSを送信する
4. テキストメッセージを受信する
5. 受信メッセージに対してSMSで返信する

ビデオを見ながらの入門がお好みですか？ YouTube上のC# SMSクイックスタートビデオ（英語）をご覧ください。

Sign up for - or sign in to - Twilio

Install the Twilio CLI

We'll need to use the Twilio CLI (command line interface) for a few tasks, so let's install that next.

Run twilio login to get the Twilio CLI connected to your account. Visit https://www.twilio.com/console, and you’ll find your unique Account SID and Auth Token to provide to the CLI.

認証トークンは、目玉アイコンをクリックすると表示されます:

Get a phone number

If you don't currently own a Twilio phone number with SMS functionality, you'll need to purchase one. With the CLI, run:

twilio phone-numbers:buy:local --country-code US --sms-enabled

Select a phone number to add it to your account.

Next, we need to install .NET Core and the Twilio C# Helper Library.

Install .NET Core

You can check if you already have .NET Core installed on your machine by opening up a command prompt or terminal and running the following command:

dotnet --version

You should see something like 2.1.3. If you receive an error message, you can download .NET Core from Microsoft and install it.

Create a new project and add the Twilio NuGet package

Run these commands to create a new .NET project and install the Twilio NuGet package:

mkdir TwilioSend
cd TwilioSend
dotnet new console
dotnet add package Twilio

C#を使用してSMSメッセージを送信する

Now that we have .NET Core and the Twilio .NET NuGet package installed, we can send an outbound text message from the Twilio phone number we just purchased with a single API request. Open the file in your new project called Program.cs and type or paste in this code sample, replacing the template code that's already there.

メッセージの送信前に、このファイルを少々編集する必要があります:

プレースホルダーのクレデンシャル値を置き換える

Swap the placeholder values for accountSid and authToken with your personal Twilio credentials. Go to https://www.twilio.com/console and log in. On this page, you’ll find your unique Account SID and Auth Token, which you’ll need any time you send messages through the Twilio Client like this. You can reveal your auth token by clicking on the 'view' link:

Program.csを編集し、accountSidおよびauthTokenに対応する値をご使用の一意な値に置き換えます。

Replace the "from" phone number

数分前に購入した、SMS機能対応の電話番号を覚えていますか？ どうぞ、既存のfrom番号をご自身の番号に置き換えてください。 また、E.164形式が使用されていることも確認します。

[+][country code][phone number including area code]

Replace the "to" phone number

Replace the to phone number with your mobile phone number. This can be any phone number that can receive text messages, but it’s a good idea to test with your own phone, so you can see the magic happen! As above, you should use E.164 formatting for this value.

Save your changes and run this code:

dotnet run

一丁上がり！ ほどなくして、Twilio電話番号から携帯電話にSMSが受信されるはずです。

Are your customers in the U.S. or Canada? You can also send them MMS messages by adding just one line of code. Check out this sending MMS tutorial to see how it's done.

Receive and reply to inbound SMS messages with ASP.NET Core

When your Twilio number receives an incoming message, Twilio will send an HTTP request to a server you control. This callback mechanism is known as a webhook. When Twilio sends your application a request, it expects a response in the TwiML XML format telling it how to respond to the message. Let's see how we would build this in C# using ASP.NET Core.

Create a new ASP.NET Core project

Run these commands to create a new ASP.NET Core project and install the Twilio NuGet package:

mkdir TwilioReceive
cd TwilioReceive
dotnet new mvc
dotnet add package Twilio.AspNet.Core

新規コントローラーを作成する

Controllersという名前のディレクトリーで、SmsController.csという新規コントローラーを作成し、下記のコードを使用して受信メッセージを処理できるサーバーを作成します。

Save the file, then run your application with:

dotnet run

In your favorite browser, open the URL https://localhost:5001/sms.

If all went well, you should see XML in your browser with the message we'd like to reply with to all our inbound texts. And, yes, that's all the code you need - there's just one more step before everything is wired up.

WebhookのURLを設定する

Now, you need to configure your Twilio phone number to call your webhook URL whenever a new message comes in. Just run this CLI command, replacing the phone number with your own Twilio phone number:

twilio phone-numbers:update "+15017122661" --sms-url="https://localhost:5001/sms"

The CLI will start an ngrok tunnel (so Twilio can reach your development machine) and wait patiently for incoming text messages!

SMSを送信しアプリケーションをテストする

Make sure your project is running and your ngrok tunnel is running.

With both of those servers running, we’re ready for the fun part - testing our new ASP.NET Core SMS application!

Send an SMS from your mobile phone to your Twilio phone number that's configured with this webhook. Your ASP.NET Core app will process the text message, and you’ll get your response back as an SMS.

関連トピック

C#および.NETを使用したSMSおよびMMSの送受信の基本について理解できたところで、下記の資料について調べてみるのも良いかもしれません。

• REST API documentation
• TwiMLリファレンス・ドキュメント
• C#用の完全なサンプルアプリケーションを含むチュートリアル
• Twilioの着信リクエストを検証してC# / ASP.NETアプリケーションを安全にする

楽しいプログラミングを！