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SlackNet ASP.NET Core Example

A basic example of how to integrate with ASP.NET Core.

Getting Started

  1. Create an app on the Slack developer website. Follow the prompts, selecting the "from scratch" option, rather than the app manifest option.
  2. Request the bot token scopes required by the demo:
    • users:read channels:read groups:read im:read mpim:read for getting user & conversation info.
    • chat:write for posting messages.
  3. Install the app to your workspace and copy the bot user OAuth token from your app's OAuth & Permissions page into the demo's appsettings.json file for the value of the ApiToken.
  4. Copy the signing secret from the Basic Information page of you app's settings to the SigningSecret value in appsettings.json.
  5. Host the web site publicly (see below). You'll need the site up and running for the next step.
  6. Enable events for your app, and set the request URL to https://<your site's base URL>/slack/event. Slack will check that your web site is up and responding to requests.
  7. Subscribe to the message.channels message.groups message.im message.mpim events in order to receive messages.
  8. Add your app to any channels/groups etc. you want it to respond to.
  9. Say "ping" to get back a "pong".

Configuring other URLs

These URLs aren't used by this example, but may be required for more advanced apps.

  • For interactivity & shortcuts:
    • Use https://<your site's base URL>/slack/action for the Interactivity Request URL.
    • Use https://<your site's base URL>/slack/options for the Select Menus Options Load URL.
  • For slash commands:
    • Use https://<your site's base URL>/slack/command for the Request URL.

Hosting

For Slack to be able to send your web site requests, it must be hosted with a publicly accessible HTTPS address. Some popular hosting services for ASP.NET apps include Azure, AWS, and Google Cloud.

Justin Gerber has written a good blog post that walks you through setting up a Slack app and hosting it in AWS.