ASP.NET Core: Mark [FromQuery] Parameter as required

Question

In my controller there is a method take accepts one route and and one query parameter as arguments:

/// <summary>
/// My Method
/// </summary>
/// <param name="routeParameter">Nice description of route parameter.</param>
/// <param name="queryParameter">Nice description of query paramter.</param>
[HttpPost("somePath/{routeParameter}")]
public IActionResult MyMethod([FromRoute] string routeParameter, [FromQuery] DateTime queryParamter)
{
   // do something 
}

In the OpenApi.json / Swagger generated from this signature via Swashbuckle XML the routeParameter (path) is always required but the queryParameter (query) is marked as optional.

How can I mark the query parameter as required, too?

Answer 1

How can I mark the query parameter as required, too?

Just use [FromQuery, BindRequired] as follow:

[HttpPost("somePath/{routeParameter}")]
public IActionResult MyMethod([FromRoute] string routeParameter, [FromQuery, BindRequired] DateTime queryParamter)
{
    // do something  
}

Here is the test result: