EventHubTrigger fails on message binding on runtime 2

[NucleoTech]

I have an EventHubTrigger function (.NET Standard 2.0) developed in Visual Studio that works correctly when running from VS, but fails when invoked on Azure platform [runtime 2.0.11776.0 (beta)]. The failure seems to be a parameter binding issue.

The IOT hub routes messages to the built-in events endpoint. I created a 'hotpath' consumer group.

Investigative information

Please provide the following:

• Timestamp: 2018-05-31 10:03:35.448
• Function App version (1.0 or 2.0-beta): 2.0-beta
• Function App name: GreatGuideFunctions
• Function name(s) (as appropriate): HandleDeviceEvent
• Invocation ID: 26f54247-4140-4c0d-b88f-4e25a5991bcf
• Region: South Central US

Repro steps

In VS on local PC:

1. Start debug session in VS 2.HTTP POST test message to IOT hub using the URL: https://<>.azure-devices.net/devices/CSS-TEST/messages/events?api-version=2016-02-03
2. Azure hosting environment displays the log message that message was processed

On Azure:

1. HTTP POST test message to IOT hub using the URL: https://<>.azure-devices.net/devices/CSS-TEST/messages/events?api-version=2016-02-03
2. Function logs report error executing the function

Expected behavior

Function should successfully execute on Azure as it does on local PC.

Actual behavior

Function execution on Azure fails with error: Failure: Exception binding parameter 'myEventHubMessage' Parameter: myEventHubMessage Value: Object reference not set to an instance of an object.

Known workarounds

None

Related information

Provide any related information

• Programming language used : C#
• Source: In details
• Bindings function.json { "generatedBy": "Microsoft.NET.Sdk.Functions-1.0.13", "configurationSource": "attributes", "bindings": [ { "type": "eventHubTrigger", "eventHubName": "platformeventhub", "consumerGroup": "hotpath", "connection": "PlatformEventHub_events", "name": "myEventHubMessage" } ], "disabled": false, "scriptFile": "../bin/DeviceEvent.dll", "entryPoint": "DeviceEvent.HandleDeviceEvent.Run" }

Source

```csharp public static class HandleDeviceEvent { [FunctionName("HandleDeviceEvent")] public static void Run( [EventHubTrigger("platformeventhub",Connection = "PlatformEventHub_events", ConsumerGroup = "hotpath")]string myEventHubMessage, [Table("PlatformSummary")] CloudTable platformSummaries, TraceWriter log) { log.Info($"Some message {DateTime.UtcNow}:{myEventHubMessage}"); } } ```

[paulbatum]

Did you set an appsetting in the portal for your function app with name "PlatformEventHub_events" containing your connection string? Because it looks like you might have that in your local settings file but the local file is not used when you're running in Azure.

[MBhatt01]

@NucleoTech Have you got any solution for this issue? I am facing similar issue with EventHubTrigger (2.0). It works correctly on local machine, but after deploying to Azure it says "error: Can't figure out which ctor to call."