Handle OData functions parameters

Question

Based on the DynamicEdmModelCreation project from ODataSamples-master odata examples and following the help received in the question Handle Odata /entityset/key/navigation We now need to expose dynamic Actions and Funcions with parameters. To support unbound function we made in the GetModel Function the following:

var GetSum = new EdmFunction("ns", "GetSum",
            new EdmPrimitiveTypeReference(EdmCoreModel.Instance.GetPrimitiveType(EdmPrimitiveTypeKind.Double), false), 
            false, null, true);
GetSum.AddParameter("param1", 
            new EdmPrimitiveTypeReference(EdmCoreModel.Instance.GetPrimitiveType(EdmPrimitiveTypeKind.Double), 
            false));
GetSum.AddParameter("param2", 
            new EdmPrimitiveTypeReference(EdmCoreModel.Instance.GetPrimitiveType(EdmPrimitiveTypeKind.Double), 
            false));

model.AddElement(GetSum);
container.AddFunctionImport(GetSum);

and in the SelectAction method we put:

if (odataPath.Segments.Count > 0 && 
            odataPath.Segments.Last() is UnboundFunctionPathSegment && 
            odataPath.Segments.Last().ToString().Contains("GetSum"))
            return "ExecuteFunction";

Finally the controller has

[HttpGet]
[HttpPost]
public IHttpActionResult ExecuteFunction(ODataActionParameters parameters)
{
    ...
}

Now testing the service:

http://localhost:2900/odata/GetSum(param1=1,param2=2)

Everything works fine except for the parameters, they always enter as null. Is there anything that we are missing to support the parameters?

Answer 1

you are declaring a function but in controller it's a action, according to http://odata.github.io/WebApi/#04-06-function-parameter-support, it should be

[HttpGet]
public string ExecuteFunction(double p1, double p2)
{
   ...
}

in controller