c# - Is it possible to have multiple GETs that vary only by parameters in ASP.NET Core?

Question

I want to build truly RESTful web service so don't want to leverage RPC-style, so have currently this:

[HttpGet]
[ActionName(nameof(GetByParticipant))]
public async Task<IActionResult> GetByParticipant([FromQuery]string participantId, [FromQuery]string participantType, [FromQuery]string programName)
{
}

[HttpGet]
[ActionName(nameof(GetByProgram))]
public async Task<IActionResult> GetByProgram([FromQuery]string programName)
{
}

And I believe that would work in ASP.NET Web API. But I'm getting an exception:

AmbiguousActionException: Multiple actions matched. The following actions matched route data and had all constraints satisfied:

TermsController.GetByParticipant (ParticipantTerms.Api)

TermsController.GetByProgram (ParticipantTerms.Api)

Neither of the attributes actually help:

• [HttpGet]
• [ActionName]
• [FromQuery]

Answer 1

You can do this using an IActionConstraint.

Here is an example:

public class ExactQueryParamAttribute : Attribute, IActionConstraint
{
    private readonly string[] keys;

    public ExactQueryParamAttribute(params string[] keys)
    {
        this.keys = keys;
    }

    public int Order => 0;

    public bool Accept(ActionConstraintContext context)
    {
        var query = context.RouteContext.HttpContext.Request.Query;
        return query.Count == keys.Length && keys.All(key => query.ContainsKey(key));
    }
}

[HttpGet]
[ActionName(nameof(GetByParticipant))]
[ExactQueryParam("participantId", "participantType", "programName")]
public async Task<IActionResult> GetByParticipant([FromQuery]string participantId, [FromQuery]string participantType, [FromQuery]string programName)
{
}

[HttpGet]
[ActionName(nameof(GetByProgram))]
[ExactQueryParam("programName")]
public async Task<IActionResult> GetByProgram([FromQuery]string programName)
{
}