Prerequisites
- You should have a basic understanding of how Azure Event Grid works and be familiar with .NET Core or .NET 5/6.
- Ensure you have set up your Azure environment and have access to Azure Portal to manage your Event Grid configurations.
Install Necessary NuGet Packages
- Before starting, make sure to install the following NuGet packages in your .NET project:
- Microsoft.Azure.EventGrid
- Newtonsoft.Json (often needed for serialization/deserialization of events)
dotnet add package Microsoft.Azure.EventGrid
dotnet add package Newtonsoft.Json
Configure Event Grid Topic
- Retrieve your Azure Event Grid Topic endpoint and access key from the Azure Portal. You will need these to authenticate your requests.
- Ensure your Event Grid topic has been set up to accept the events you're interested in publishing or subscribing to.
- Create a configuration section in your appsettings.json for storing Event Grid related configurations:
{
"EventGrid": {
"TopicEndpoint": "YOUR_EVENT_GRID_TOPIC_ENDPOINT",
"AccessKey": "YOUR_ACCESS_KEY"
}
}
Publishing Events to Event Grid
- Create a method to publish events to your Event Grid:
using System;
using System.Collections.Generic;
using System.Threading.Tasks;
using Microsoft.Azure.EventGrid;
using Microsoft.Azure.EventGrid.Models;
using Newtonsoft.Json;
public class EventGridPublisher
{
private static string topicEndpoint = "YOUR_EVENT_GRID_TOPIC_ENDPOINT";
private static string accessKey = "YOUR_ACCESS_KEY";
public async Task PublishEventAsync()
{
string topicHostname = new Uri(topicEndpoint).Host;
var topicCredentials = new TopicCredentials(accessKey);
var client = new EventGridClient(topicCredentials);
var events = new List<EventGridEvent>
{
new EventGridEvent
{
Id = Guid.NewGuid().ToString(),
EventType = "My.CustomEventType",
Data = new { Message = "Hello, Event Grid!" },
EventTime = DateTime.Now,
Subject = "MyEvent",
DataVersion = "1.0"
}
};
await client.PublishEventsAsync(topicHostname, events);
}
}
- The above code creates an instance of
EventGridClient and uses it to publish a list of EventGridEvent to the specified topic.
- Remember to replace placeholders for
topicEndpoint and accessKey with actual values from your Azure setup.
Handling Events
- To process events, typically set up an Azure function or web API that subscribes to the Event Grid. Here's a basic handler in .NET Core:
using Microsoft.AspNetCore.Mvc;
using Microsoft.Azure.EventGrid.Models;
using Newtonsoft.Json;
[Route("api/[controller]")]
public class EventHandlerController : ControllerBase
{
[HttpPost]
public IActionResult HandleEvent([FromBody] EventGridEvent[] eventGridEvents)
{
foreach (var eventGridEvent in eventGridEvents)
{
if (eventGridEvent.EventType == "My.CustomEventType")
{
dynamic eventData = JsonConvert.DeserializeObject(eventGridEvent.Data.ToString());
Console.WriteLine($"Received message: {eventData.Message}");
}
}
return Ok();
}
}
- This endpoint receives event data, deserializes it, and processes it based on the event type.
Testing and Monitoring
- Once integrated, you can test the end-to-end flow by triggering events manually from Azure or using tools like Postman to simulate event pushes.
- Monitor your Event Grid using Azure Monitor to ensure messages are being successfully dispatched and received.
