How to add metadata to Message when using an output binding?

[moagardell]

I am using a Azure Function with an output bidning as is described in section: "Using ICollector with Service Bus queue bindings"
I need to add specifik metadata to the message that are added to the queue, but it seeams like thats not supported?
I want to filter the messages in the topic with Message.CorrelationId or Message.Label,
I tried to use ICollector<Message> but it throws exception "Error getting value from 'ExpiresAtUtc' on 'Microsoft.Azure.ServiceBus.Message'".
How can I add metadata to the message using output bindings?

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Document Details

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• ID: 9960577d-471e-c834-d87c-134a9de4cd9e
• Version Independent ID: 4daa5650-7ac6-2a49-28e5-d114fa7cf14b
• Content: Azure Functions Recipes - Service Bus
• Content Source: sandbox/functions-recipes/service-bus.md
• Service: functions
• GitHub Login: @cecilphillip
• Microsoft Alias: cephilli