Azure Functions 4.0: The Road to .NET 6

Azure Functions 4.0 brings first-class .NET 6 support and the **Isolated Process Model** (out-of-process), which decouples your app from the Functions runtime version.

In-Process vs Isolated

Creating Isolated Function

[Function("HttpTrigger")]
public HttpResponseData Run(
    [HttpTrigger(AuthorizationLevel.Function, "get")] HttpRequestData req)
{
    var response = req.CreateResponse(HttpStatusCode.OK);
    response.WriteString("Hello from Isolated .NET 6!");
    return response;
}

Key Takeaways

• Use Isolated for new projects—it’s the future.
• Gain custom middleware (e.g., for logging or auth).