How to set camel case using IAsyncCollector with System.Text.Json in Azure Functions?

user_275882 0
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I'm migrating Azure Functions v3 from Newtonsoft.Json to System.Text.Json and trying to get camelCase working globally.

For these:

  • SignalR
  • Service Bus output bindings
  • Cosmos DB

I was able to explicitly pass JsonSerializerOptions or set it globally (SignalR) but I'm not able to do so for IAsyncCollector.

Here is my code:

[FunctionName(nameof(SampleFunction))]
public async Task Run(
    [ServiceBusTrigger(ServiceBusQueue.QueueA)] string json,
    [ServiceBus(ServiceBusQueue.QueueB)] IAsyncCollector<Delivery> queueB,
    [ServiceBus(ServiceBusQueue.QueueC)] IAsyncCollector<Driver> queueC,
    ExecutionContext context)
{
        // ... do some work

        await queueB.AddAsync(objectB).ConfigureAwait(false);

        // ... do some more work

        await queueC.AddAsync(objectC).ConfigureAwait(false);
}

objectB and objectC ends up in service bus not with camel case. As a workaround I'm setting property names as case insensitive on the receiving function.

PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
PropertyNameCaseInsensitive = true

Any idea how can I get IAsyncCollector to serialize with camel case?

azureservicebus system.text.json azure-functions serialization c#
1 Answers

I recommend not using IAsyncCollector at all. The providers for IAsyncCollector don't have many knobs for configuration:

  • Serialization
  • Batching
  • Retries
  • Error handling

What's more, some implementations have changed these implementation details between releases without warning. For these reasons, I recommend never using IAsyncCollector and just using the APIs directly, where you have full control over all of these aspects. IAsyncCollector is a nice abstraction, but it's precisely that abstract nature that makes it unsuitable in the end.

user_2636930
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