ASP.NET Core 7 Web API : optional query parameters not captured by ApiController

Question

I have an ASP.NET Core 7 Web API service implemented in C# and a method defined like this:

[ApiController]
[Route("api/[controller]")]
public class SensorsController : ControllerBase
{
    // ...
    [HttpGet("{sensorname}/zf")]
    public async Task<ActionResult> GetZForecast(string sensorname, [FromQuery]DateTime? when, [FromQuery]string? wind)
    {
        // ...
    }
}

I want to test it with this curl command:

curl -X get https://localhost:7091/api/Sensors/VK_THC_GreenRoom/zf?when="2025-03-15T08:00:00Z"&wind="Calm"

Why is the wind parameter not captured by the controller in this case?

If I use only one of the optional query parameter like shown below, then all works just fine and both wind and when are captured respectively:

curl -X get https://localhost:7091/api/Sensors/VK_THC_GreenRoom/zf?when="2025-03-15T08:00:00Z"

curl -X get https://localhost:7091/api/Sensors/VK_THC_GreenRoom/zf?wind="Calm"

So what am I missing ?

See if answer here helps : stackoverflow.com/questions/59621053/…. Look at the HTTPGet in the answer. — jdweng
– jdweng, Commented Mar 22 at 18:24
Thanks @jdweng but I think that is a different story and is not applicable here. Route is the same and is correct in all cases, it is rather the query parameter which is not parsed in some way. — László Frank
– László Frank, Commented Mar 22 at 18:35
Remove the quotes from the URL, you don't need it for the query param value: https://localhost:7091/api/Sensors/VK_THC_GreenRoom/zf?when=2025-03-15T08:00:00Z&wind=Calm — Yong Shun
– Yong Shun, Commented Mar 23 at 1:35

marc_s · Accepted Answer · 2025-03-23 07:22:14Z

1

In curl The entire URL should be enclosed in quotes to ensure that the shell interprets it correctly:

curl -X GET "https://localhost:7091/api/Sensors/VK_THC_GreenRoom/zf?when=2025-03-15T08:00:00Z&wind=Calm"

edited Mar 23 at 7:22

marc_s

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answered Mar 23 at 1:50

rouisaek

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