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Custom API empty EntityCollection Request Parameter

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Posted on by tdashworth

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Hello!

I have build a Custom API with a required EntityCollection request parameter. One use case I have is to sent an empty array but I'm getting a strange error.

When requesting with no parameter, it fails correctly.
When requesting with the parameter, with at least one item, it works.
When requesting with the parameter as as empty array, it errors with 'Object reference not set to an instance of an object.'

The only thoughts I have currently are that Dynamics picks the first item to understand the EntityCollection type but as there are no values it fails inelegantly. I tried setting the Logical Entity Name on the request parameter but I get an error where this can only be set for Entity and EntityReference types.

I recognise one solution could be to make the parameter optional and optionally set it but that's more for the caller...

Why questions to the community are:

Am I missing something here that would make it work?
Is this expected (logical) behaviour?
Are others able to repeat this?

I was able to reprocess this in isolation....

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