Agent skill

azure-eventgrid-dotnet

Azure Event Grid SDK for .NET. Client library for publishing and consuming events with Azure Event Grid. Use for event-driven architectures, pub/sub messaging, CloudEvents, and EventGridEvents. Triggers: "Event Grid", "EventGridPublisherClient", "CloudEvent", "EventGridEvent", "publish events .NET", "event-driven", "pub/sub".

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SKILL.md

Azure.Messaging.EventGrid (.NET)

Client library for publishing events to Azure Event Grid topics, domains, and namespaces.

Installation

bash
# For topics and domains (push delivery)
dotnet add package Azure.Messaging.EventGrid

# For namespaces (pull delivery)
dotnet add package Azure.Messaging.EventGrid.Namespaces

# For CloudNative CloudEvents interop
dotnet add package Microsoft.Azure.Messaging.EventGrid.CloudNativeCloudEvents

Current Version: 4.28.0 (stable)

Environment Variables

bash
# Topic/Domain endpoint
EVENT_GRID_TOPIC_ENDPOINT=https://<topic-name>.<region>.eventgrid.azure.net/api/events
EVENT_GRID_TOPIC_KEY=<access-key>

# Namespace endpoint (for pull delivery)
EVENT_GRID_NAMESPACE_ENDPOINT=https://<namespace>.<region>.eventgrid.azure.net
EVENT_GRID_TOPIC_NAME=<topic-name>
EVENT_GRID_SUBSCRIPTION_NAME=<subscription-name>

Client Hierarchy

Push Delivery (Topics/Domains)
└── EventGridPublisherClient
    ├── SendEventAsync(EventGridEvent)
    ├── SendEventsAsync(IEnumerable<EventGridEvent>)
    ├── SendEventAsync(CloudEvent)
    └── SendEventsAsync(IEnumerable<CloudEvent>)

Pull Delivery (Namespaces)
├── EventGridSenderClient
│   └── SendAsync(CloudEvent)
└── EventGridReceiverClient
    ├── ReceiveAsync()
    ├── AcknowledgeAsync()
    ├── ReleaseAsync()
    └── RejectAsync()

Authentication

API Key Authentication

csharp
using Azure;
using Azure.Messaging.EventGrid;

EventGridPublisherClient client = new(
    new Uri("https://mytopic.eastus-1.eventgrid.azure.net/api/events"),
    new AzureKeyCredential("<access-key>"));

Microsoft Entra ID (Recommended)

csharp
using Azure.Identity;
using Azure.Messaging.EventGrid;

EventGridPublisherClient client = new(
    new Uri("https://mytopic.eastus-1.eventgrid.azure.net/api/events"),
    new DefaultAzureCredential());

SAS Token Authentication

csharp
string sasToken = EventGridPublisherClient.BuildSharedAccessSignature(
    new Uri(topicEndpoint),
    DateTimeOffset.UtcNow.AddHours(1),
    new AzureKeyCredential(topicKey));

var sasCredential = new AzureSasCredential(sasToken);
EventGridPublisherClient client = new(
    new Uri(topicEndpoint),
    sasCredential);

Publishing Events

EventGridEvent Schema

csharp
EventGridPublisherClient client = new(
    new Uri(topicEndpoint),
    new AzureKeyCredential(topicKey));

// Single event
EventGridEvent egEvent = new(
    subject: "orders/12345",
    eventType: "Order.Created",
    dataVersion: "1.0",
    data: new { OrderId = "12345", Amount = 99.99 });

await client.SendEventAsync(egEvent);

// Batch of events
List<EventGridEvent> events = new()
{
    new EventGridEvent(
        subject: "orders/12345",
        eventType: "Order.Created",
        dataVersion: "1.0",
        data: new OrderData { OrderId = "12345", Amount = 99.99 }),
    new EventGridEvent(
        subject: "orders/12346",
        eventType: "Order.Created",
        dataVersion: "1.0",
        data: new OrderData { OrderId = "12346", Amount = 149.99 })
};

await client.SendEventsAsync(events);

CloudEvent Schema

csharp
CloudEvent cloudEvent = new(
    source: "/orders/system",
    type: "Order.Created",
    data: new { OrderId = "12345", Amount = 99.99 });

cloudEvent.Subject = "orders/12345";
cloudEvent.Id = Guid.NewGuid().ToString();
cloudEvent.Time = DateTimeOffset.UtcNow;

await client.SendEventAsync(cloudEvent);

// Batch of CloudEvents
List<CloudEvent> cloudEvents = new()
{
    new CloudEvent("/orders", "Order.Created", new { OrderId = "1" }),
    new CloudEvent("/orders", "Order.Updated", new { OrderId = "2" })
};

await client.SendEventsAsync(cloudEvents);

Publishing to Event Grid Domain

csharp
// Events must specify the Topic property for domain routing
List<EventGridEvent> events = new()
{
    new EventGridEvent(
        subject: "orders/12345",
        eventType: "Order.Created",
        dataVersion: "1.0",
        data: new { OrderId = "12345" })
    {
        Topic = "orders-topic"  // Domain topic name
    },
    new EventGridEvent(
        subject: "inventory/item-1",
        eventType: "Inventory.Updated",
        dataVersion: "1.0",
        data: new { ItemId = "item-1" })
    {
        Topic = "inventory-topic"
    }
};

await client.SendEventsAsync(events);

Custom Serialization

csharp
using System.Text.Json;

var serializerOptions = new JsonSerializerOptions
{
    PropertyNamingPolicy = JsonNamingPolicy.CamelCase
};

var customSerializer = new JsonObjectSerializer(serializerOptions);

EventGridEvent egEvent = new(
    subject: "orders/12345",
    eventType: "Order.Created",
    dataVersion: "1.0",
    data: customSerializer.Serialize(new OrderData { OrderId = "12345" }));

await client.SendEventAsync(egEvent);

Pull Delivery (Namespaces)

Send Events to Namespace Topic

csharp
using Azure;
using Azure.Messaging;
using Azure.Messaging.EventGrid.Namespaces;

var senderClient = new EventGridSenderClient(
    new Uri(namespaceEndpoint),
    topicName,
    new AzureKeyCredential(topicKey));

// Send single event
CloudEvent cloudEvent = new("employee_source", "Employee.Created", 
    new { Name = "John", Age = 30 });
await senderClient.SendAsync(cloudEvent);

// Send batch
await senderClient.SendAsync(new[]
{
    new CloudEvent("source", "type", new { Name = "Alice" }),
    new CloudEvent("source", "type", new { Name = "Bob" })
});

Receive and Process Events

csharp
var receiverClient = new EventGridReceiverClient(
    new Uri(namespaceEndpoint),
    topicName,
    subscriptionName,
    new AzureKeyCredential(topicKey));

// Receive events
ReceiveResult result = await receiverClient.ReceiveAsync(maxEvents: 10);

List<string> lockTokensToAck = new();
List<string> lockTokensToRelease = new();

foreach (ReceiveDetails detail in result.Details)
{
    CloudEvent cloudEvent = detail.Event;
    string lockToken = detail.BrokerProperties.LockToken;
    
    try
    {
        // Process the event
        Console.WriteLine($"Event: {cloudEvent.Type}, Data: {cloudEvent.Data}");
        lockTokensToAck.Add(lockToken);
    }
    catch (Exception)
    {
        // Release for retry
        lockTokensToRelease.Add(lockToken);
    }
}

// Acknowledge successfully processed events
if (lockTokensToAck.Any())
{
    await receiverClient.AcknowledgeAsync(lockTokensToAck);
}

// Release events for retry
if (lockTokensToRelease.Any())
{
    await receiverClient.ReleaseAsync(lockTokensToRelease);
}

Reject Events (Dead Letter)

csharp
// Reject events that cannot be processed
await receiverClient.RejectAsync(new[] { lockToken });

Consuming Events (Azure Functions)

EventGridEvent Trigger

csharp
using Azure.Messaging.EventGrid;
using Microsoft.Azure.WebJobs;
using Microsoft.Azure.WebJobs.Extensions.EventGrid;

public static class EventGridFunction
{
    [FunctionName("ProcessEventGridEvent")]
    public static void Run(
        [EventGridTrigger] EventGridEvent eventGridEvent,
        ILogger log)
    {
        log.LogInformation($"Event Type: {eventGridEvent.EventType}");
        log.LogInformation($"Subject: {eventGridEvent.Subject}");
        log.LogInformation($"Data: {eventGridEvent.Data}");
    }
}

CloudEvent Trigger

csharp
using Azure.Messaging;
using Microsoft.Azure.Functions.Worker;

public class CloudEventFunction
{
    [Function("ProcessCloudEvent")]
    public void Run(
        [EventGridTrigger] CloudEvent cloudEvent,
        FunctionContext context)
    {
        var logger = context.GetLogger("ProcessCloudEvent");
        logger.LogInformation($"Event Type: {cloudEvent.Type}");
        logger.LogInformation($"Source: {cloudEvent.Source}");
        logger.LogInformation($"Data: {cloudEvent.Data}");
    }
}

Parsing Events

Parse EventGridEvent

csharp
// From JSON string
string json = "..."; // Event Grid webhook payload
EventGridEvent[] events = EventGridEvent.ParseMany(BinaryData.FromString(json));

foreach (EventGridEvent egEvent in events)
{
    if (egEvent.TryGetSystemEventData(out object systemEvent))
    {
        // Handle system event
        switch (systemEvent)
        {
            case StorageBlobCreatedEventData blobCreated:
                Console.WriteLine($"Blob created: {blobCreated.Url}");
                break;
        }
    }
    else
    {
        // Handle custom event
        var customData = egEvent.Data.ToObjectFromJson<MyCustomData>();
    }
}

Parse CloudEvent

csharp
CloudEvent[] cloudEvents = CloudEvent.ParseMany(BinaryData.FromString(json));

foreach (CloudEvent cloudEvent in cloudEvents)
{
    var data = cloudEvent.Data.ToObjectFromJson<MyEventData>();
    Console.WriteLine($"Type: {cloudEvent.Type}, Data: {data}");
}

System Events

csharp
// Common system event types
using Azure.Messaging.EventGrid.SystemEvents;

// Storage events
StorageBlobCreatedEventData blobCreated;
StorageBlobDeletedEventData blobDeleted;

// Resource events
ResourceWriteSuccessEventData resourceCreated;
ResourceDeleteSuccessEventData resourceDeleted;

// App Service events
WebAppUpdatedEventData webAppUpdated;

// Container Registry events
ContainerRegistryImagePushedEventData imagePushed;

// IoT Hub events
IotHubDeviceCreatedEventData deviceCreated;

Key Types Reference

Type Purpose
EventGridPublisherClient Publish to topics/domains
EventGridSenderClient Send to namespace topics
EventGridReceiverClient Receive from namespace subscriptions
EventGridEvent Event Grid native schema
CloudEvent CloudEvents 1.0 schema
ReceiveResult Pull delivery response
ReceiveDetails Event with broker properties
BrokerProperties Lock token, delivery count

Event Schemas Comparison

Feature EventGridEvent CloudEvent
Standard Azure-specific CNCF standard
Required fields subject, eventType, dataVersion, data source, type
Extensibility Limited Extension attributes
Interoperability Azure only Cross-platform

Best Practices

  1. Use CloudEvents — Prefer CloudEvents for new implementations (industry standard)
  2. Batch events — Send multiple events in one call for efficiency
  3. Use Entra ID — Prefer managed identity over access keys
  4. Idempotent handlers — Events may be delivered more than once
  5. Set event TTL — Configure time-to-live for namespace events
  6. Handle partial failures — Acknowledge/release events individually
  7. Use dead-letter — Configure dead-letter for failed events
  8. Validate schemas — Validate event data before processing

Error Handling

csharp
using Azure;

try
{
    await client.SendEventAsync(cloudEvent);
}
catch (RequestFailedException ex) when (ex.Status == 401)
{
    Console.WriteLine("Authentication failed - check credentials");
}
catch (RequestFailedException ex) when (ex.Status == 403)
{
    Console.WriteLine("Authorization failed - check RBAC permissions");
}
catch (RequestFailedException ex) when (ex.Status == 413)
{
    Console.WriteLine("Payload too large - max 1MB per event, 1MB total batch");
}
catch (RequestFailedException ex)
{
    Console.WriteLine($"Event Grid error: {ex.Status} - {ex.Message}");
}

Failover Pattern

csharp
try
{
    var primaryClient = new EventGridPublisherClient(primaryUri, primaryKey);
    await primaryClient.SendEventsAsync(events);
}
catch (RequestFailedException)
{
    // Failover to secondary region
    var secondaryClient = new EventGridPublisherClient(secondaryUri, secondaryKey);
    await secondaryClient.SendEventsAsync(events);
}

Related SDKs

SDK Purpose Install
Azure.Messaging.EventGrid Topics/Domains (this SDK) dotnet add package Azure.Messaging.EventGrid
Azure.Messaging.EventGrid.Namespaces Pull delivery dotnet add package Azure.Messaging.EventGrid.Namespaces
Azure.Identity Authentication dotnet add package Azure.Identity
Microsoft.Azure.WebJobs.Extensions.EventGrid Azure Functions trigger dotnet add package Microsoft.Azure.WebJobs.Extensions.EventGrid

Reference Links

Resource URL
NuGet Package https://www.nuget.org/packages/Azure.Messaging.EventGrid
API Reference https://learn.microsoft.com/dotnet/api/azure.messaging.eventgrid
Quickstart https://learn.microsoft.com/azure/event-grid/custom-event-quickstart
Pull Delivery https://learn.microsoft.com/azure/event-grid/pull-delivery-overview
GitHub Source https://github.com/Azure/azure-sdk-for-net/tree/main/sdk/eventgrid/Azure.Messaging.EventGrid

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