Web Api OData：在集合属性值的项目中检测到空值

Question

I want to return following records from OData:

Player
{
    Numbers: [1, null, 3]
}

"Numbers" being a collection of nullable items (say IEnumerable). OData has a problem if any of the items in the Numbers collection is null:

A null value was detected in the items of a collection property value; non-streaming instances of collection types do not support null values as items.

Is there a way around it?

I'm using Web Api OData 2.2 (v3)

Thanks, Stevo

Answer 1

Try defining the Numbers property like this:

public IEnumerable<int?> Numbers { get; set; } 

I've tested such POCO definition with some in-memory data:

Numbers = new int?[]{1,null,2}

and it works fine for a V4 service written using Web API:

Numbers: [
    1,
    null,
    2
],

I believe it should work also for a V3 service.