How can I resolve this NewtonSoft version conflict? - azure

Question

I'm working on an Azure function. I'm using Microsoft.Azure.Devices.Shared, which requires NewtonSoft v11, so I've implemented some manual binding redirects with the app domain which seems to be working (see below). But somehow, there is a hard reference to the WebJob app domain that NewtonSoft is conflicting with if I'm reading the log below correctly:
2018-05-21T22:03:03.824 [Info] Exception:
[A]Newtonsoft.Json.Linq.JObject cannot be cast to
[B]Newtonsoft.Json.Linq.JObject. Type A originates from
'Newtonsoft.Json, Version=9.0.0.0, Culture=neutral,
PublicKeyToken=30ad4fe6b2a6aeed' in the context 'Default' at location
'D:\Program Files
(x86)\SiteExtensions\Functions\1.0.11702\bin\Newtonsoft.Json.dll'.
Type B originates from 'Newtonsoft.Json, Version=11.0.0.0,
Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed' in the context
'LoadNeither' in a byte array.
My Newtonsoft v11 dll is in the function's bin directory and is referenced there like so:
#r "bin\Newtonsoft.Json.dll"
There is actual code in the function that works correctly in the function:
dynamic eventHubMessage =
JsonConvert.DeserializeObject<JObject>(myEventHubMessage);
But when it hits this line:
CRSLTwinData twinData = IotHubProxy.GetTwinData(hubDeviceId);
It throws the exception. The reference to M.A.D.Shared and Newtonsoft 11 is therein.
I've tried everything I can to get the function to use the 11 version of the dll, but something is obviously out of whack.
UPDATE: we tried redirecting to 9 instead and got this:
2018-05-22T13:24:48.336 [Info] Exception: [A]Newtonsoft.Json.Linq.JObject cannot be cast to
[B]Newtonsoft.Json.Linq.JObject. Type A originates from
'Newtonsoft.Json, Version=9.0.0.0, Culture=neutral,
PublicKeyToken=30ad4fe6b2a6aeed' in the context 'Default' at location
'D:\Program Files
(x86)\SiteExtensions\Functions\1.0.11702\bin\Newtonsoft.Json.dll'.
Type B originates from 'Newtonsoft.Json, Version=10.0.0.0,
Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed' in the context
'LoadFrom' at location 'D:\local\Temporary ASP.NET
Files\root\e801054b\3f30c00f\assembly\dl3\e5381214\00f64e9a_9af1d301\Newtonsoft.Json.dll'.
Then we tried redirect to 10 and got this :):
2018-05-22T14:16:14.509 [Info] Exception:
[A]Newtonsoft.Json.Linq.JObject cannot be cast to
[B]Newtonsoft.Json.Linq.JObject. Type A originates from
'Newtonsoft.Json, Version=9.0.0.0, Culture=neutral,
PublicKeyToken=30ad4fe6b2a6aeed' in the context 'Default' at location
'D:\Program Files
(x86)\SiteExtensions\Functions\1.0.11702\bin\Newtonsoft.Json.dll'.
Type B originates from 'Newtonsoft.Json, Version=10.0.0.0,
Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed' in the context
'LoadFrom' at location 'D:\local\Temporary ASP.NET
Files\root\e801054b\3f30c00f\assembly\dl3\e5381214\00f64e9a_9af1d301\Newtonsoft.Json.dll'.

Answer 1

I presume you are using azure function 1.0 which has known assembly resolution problem.
Since webjob use strict version number of Newtonsoft json, what I have done in my project is to downgrade all mine to inline with the sdk's

Answer 2

Use Microsoft.NET.Sdk.Functions version 1.0.13, which consumes Newtonsoft.Json 10.0.3