Should a required array bound to query string throw an exception when omitted?

[mauler2025]

I am not sure whether the current implementation is a bug or a feature.

If we navigate to "/" without specifying the required x, the framework does not throw an exception.
Interestingly x is set to a zero-length array.

app.MapGet("/", ([FromQuery] int[] x) =>
{
    return $"Length of x is : {x.Length}";
});

But if I change the binding source from FromQuery to FromBody, the framework behaves as expected.
It does throw an exception if the required x is omitted.

Question:

Should a required array bound to query string throw an exception when omitted?

[rafikiassumani-msft]

Triage: This is by design. The behavior was introduced in .NET7. We will keep this issue open for more feedback and revisit it during our .NET8 Planning.

Thanks for contacting us.

We're moving this issue to the .NET 8 Planning milestone for future evaluation / consideration. We would like to keep this around to collect more feedback, which can help us with prioritizing this work. We will re-evaluate this issue, during our next planning meeting(s).
If we later determine, that the issue has no community involvement, or it's very rare and low-impact issue, we will close it - so that the team can focus on more important and high impact issues.
To learn more about what to expect next and how this issue will be handled you can read more about our triage process here.

[Youssef1313]

See also #45956 which has a bit more context. We might just need to update and clarify documentation.