Create a bot

APPLIES TO: SDK v4

This article shows you how to build a bot by using the Bot Framework SDK, and then shows how to test it with the Bot Framework Emulator.

Creating a bot with Azure Bot Service and creating a bot locally are independent, parallel ways to create a bot.

Prerequisites

Templates

To add the bot templates to Visual Studio, download and install the Bot Framework v4 SDK Templates for Visual Studio VSIX file.

Note

The VSIX package includes both .NET Core 2.1 and .NET Core 3.1 versions of the C# templates. When creating new bots in Visual Studio 2019, you should use the .NET Core 3.1 templates. The current bot samples use .NET Core 3.1 templates. You can find the samples that use .NET Core 2.1 templates in the 4.7-archive branch of the BotBuilder-Samples repository. For information about deploying .NET Core 3.1 bots to Azure, see how to deploy your bot to Azure.

Create a bot

In Visual Studio, create a new bot project using the Echo Bot (Bot Framework v4 - .NET Core 3.1) template. Choose AI Bots from the project types to show only bot templates.

Visual Studio create a new project dialog

Thanks to the template, your project contains all the code that's necessary to create the bot in this quickstart. You don't need any additional code to test your bot.

Note

If you create a Core bot, you'll need a LUIS language model. You can create a language model at luis.ai. After creating the model, update the configuration file.

Start your bot

In Visual Studio

  1. Open your bot project.
  2. Run the project without debugging.

This will build the application, deploy it to localhost, and launch the web browser to display the application's default.htm page. At this point, your bot is running locally on port 3978.

Start the Emulator and connect your bot

  1. Start the Bot Framework Emulator.

  2. Select Open Bot on the Emulator's Welcome tab.

  3. Enter your bot's URL, which is the URL of the local port, with /api/messages added to the path, typically http://localhost:3978/api/messages.

    open a bot

  4. Then select Connect.

    Send a message to your bot, and the bot will respond back.

    echo message

Additional Resources

  • See Debug a bot for how to debug using Visual Studio or Visual Studio Code and the Bot Framework Emulator.
  • See Tunneling (ngrok) for information on how to install ngrok.

Next steps