[V2] Reference assemblies in bin which are created by registering binding extensions

[JohnReeson]

I find we have to create storage(blob/queue) trigger, i.e. install storage extensions to use syntax like #r "AssemblyName" to reference assembly under D:\home\site\wwwroot\bin.

Repro steps

1. Create a v2 c# eventhub trigger in portal, install eventhub extensions as required. Confirm installation succeeded as I see assemblies( include Microsoft.Azure.EventHubs.dll) in bin folder.

2. use code below.

   #r "Microsoft.Azure.EventHubs"
   
   using System;
   using Microsoft.Azure.EventHubs;
   
   public static void Run(EventData myEventHubMessage, ILogger log)
   {
       log.LogInformation($"EnqueuedTimeUtc= {myEventHubMessage.SystemProperties.EnqueuedTimeUtc}");
   }
   

3. Got compilation error as below

   2018-10-19T15:15:53.595 [Error] run.csx(1,1): error CS0006: Metadata file 'Microsoft.Azure.EventHubs' could not be found
   2018-10-19T15:15:53.732 [Error] run.csx(4,23): error CS0234: The type or namespace name 'EventHubs' does not exist in the namespace 'Microsoft.Azure' (are you missing an assembly reference?)
   2018-10-19T15:15:53.829 [Error] run.csx(6,24): error CS0246: The type or namespace name 'EventData' could not be found (are you missing a using directive or an assembly reference?)
   

4. Change #r "Microsoft.Azure.EventHubs" to #r "../bin/Microsoft.Azure.EventHubs.dll", then compilation succeeded.

5. In same function app ,create a queue trigger.(storage extensions installed)

6. Go back to eventhub trigger and use #r "Microsoft.Azure.EventHubs" again, this time compilation succeeded and code works fine.

7. To avoid cache or something similar, repeat these steps and repro it in several new Function apps.

8. Another example is v2 sendgrid template. The template uses queuetrigger(i.e. storage extensions installed) and #r "SendGrid" works. But if the whole function app doesn't install storage extensions, like a time trigger with SendGrid output, we have to use #r "../bin/SendGrid.dll"

Don't understand how this happened, did I miss sth?

[YuichiNukiyama]

Same thing happens in v2 sendgrid template. The template uses queuetrigger(i.e. storage extensions installed) and #r "SendGrid" works. But in a TimerTrigger with SendGrid output, have to use #r "../bin/SendGrid.dll".

It happened in V2 HttpTrigger Template when I manually add SendGrid to output.

[slyons]

This is still an issue. Had the same issue with EventHubs:

#r "Microsoft.Azure.EventHubs" did not work, but #r "../bin/Microsoft.Azure.EventHubs.dll" did.

[soninaren]

This is fixed now. #r "Microsoft.Azure.EventHubs". tested with EventHub version 3.0.6 and function runtime v2 and v3.

[soninaren]

#r "Microsoft.Azure.EventHubs" should work now. The templates currently use #r "../bin/Microsoft.Azure.EventHubs.dll" which was a tactical fix. Will update the template to use #r "Microsoft.Azure.EventHubs"