Custom API empty EntityCollection Request Parameter

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Posted on by tdashworth

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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lvdk92 2 on at

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Hi,

We encounter the same problem, but our request parameter (EntityCollection) is optional.

- When we make the request with no parameter, it continues the code correctly

- When we make the request with the parameter, with at least one item, it continues the code correctly.

- When we make the request with the parameter als an empty array, we get the error: "Object reference not set to an instance of an object."

Have you found the solution yet?

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tdashworth 33 on at

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I raised this with MS support and the product group agreed this is a bug. They added it to their backlog and said it will take several months to get to but will keep me posted.

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