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Azure Function Json Tests

This repo contains a simple setup for exploring the behaviour of version dependencies with when running as part of an Azure Function (v1). The solution contains two Projects:


A basic repository-pattern style class library (C# Class Library compiling to .net Standard 2). Contains:

  • abstract base class modelling data entities plus a single concrete implementation
  • simple repostiory for supporting R + W operations
  • Utils package for working with CosmosDb


An Azure Functions (V1) app (.Net Full Framework 4.7.2).

  • Contains a single function triggered via a HTTP request.
  • Function parses some hard-coded JSON to build up an object, stores it in CosmosDB and examines the Types of data present at various points
  • Outputs results of tests to the Function console log

This setup is a representative example of our production architecture. Both Projects include an explict reference to Newtonsoft.Json version 10.0.3

Observed Behaviour

Deserializing JSON with "complex" properties (nested objects) to anonymous objects (e.g. Dictionary<string, object> ) results in those complex properties being represented as JObjects (Newtonsoft.Json.Linq.JObject). At the point of deserisling, and passing these into the data project, Type checking is working as expected:

sprocketItem["Supplier"].GetType().FullName; //"Newtonsoft.Json.Linq.JObject"
sprocketItem["Supplier"].GetType() == typeof(Newtonsoft.Json.Linq.JObject); //true

However after the entity passes through the CosmosDB Client, these Type checks fail

itemAfterSave["Supplier"].GetType().FullName; //"Newtonsoft.Json.Linq.JObject"
itemAfterSave["Supplier"].GetType() == typeof(Newtonsoft.Json.Linq.JObject); //false

Additionally, with our production stack, we are seeing different behaviour with how CosmosDB is serialising DynamicObjects when compared to running in a WebAPI with binding redirects to force to 10.0.3