How binding works in .NET 5 version of Azure Function changed slightly compared to last version. In this article, I explain how you can get EventData for Event Hub input binding.

Get Event Hub message content

This is template code and you can see the message comes in as string array.

using System;
using Microsoft.Azure.Functions.Worker;
using Microsoft.Extensions.Logging;

namespace eventhubbinding
{
    public static class eventhubtriggerdemo
    {
        [Function("eventhubtriggerdemo")]
        public static void Run([EventHubTrigger("samples-workitems", Connection = "")] string[] input, FunctionContext context)
        {
            var logger = context.GetLogger("eventhubtriggerdemo");
            logger.LogInformation($"First Event Hubs triggered message: {input[0]}");
        }
    }
}

input argument contains message from EventHub.

How about EventData?

We can get EventData from FunctionContext. I don't feel this is ideal way to obtain data, but we can get it anyway.

There is a GitHub issue for this as well.
https://github.com/Azure/azure-functions-dotnet-worker/issues/283

Summary

I hope we can switch signature from string[] to EventData like we did in previous version, but this is how it works for now.