OData v4 unbound function with custom routing - asp.net-web-api

Question

I have created a "Utilities" controller that is not bound to any model and contains only unbound functions.
I would like to be able to call this through a url like the following:
odata/Utilities/SomeMethod()
Right now I have to call it like the following:
odata/SomeMethod()
How do I create a custom route for "utilities"?
I have tried:
[ODataRoutePrefix("Utilities")]
public class UtilitiesController : ODataController
I have also tried:
[ODataRoute("Utilities/SomeMethod()"]
public string SomeMethod()
But both of these throw an error:
"The path template 'Utilities/SomeMethod()' on the action 'SomeMethod' in controller 'Utilities' is not a valid OData path template. Resource not found for the segment 'Utilities'."

Answer 1

You can override the default controller selector to achieve this. You can create a new class that inherits from DefaultHttpControllerSelector like this:
public class CustomControllerSelector : DefaultHttpControllerSelector
{
public override string GetControllerName(HttpRequestMessage request)
{
string controllerName = null;
// I haven't tested this, but here you can decide whether you want to
// route to your new controller or not
if (request.ODataProperties().Path.PathTemplate == "~/UnboundFunction")
{
controllerName = "UtilitiesController";
}
else
{
controllerName = base.GetControllerName(request);
}
return controllerName;
}
}
And then you can replace the controller selector like this:
config.Services.Replace(typeof(IHttpControllerSelector), new CustomControllerSelector());
This lets you choose which controller to use at runtime for every request

Answer 2

Define the controller class:
public class UtilitiesController : ODataController
{
[System.Web.Http.HttpGet]
[ODataRoute("SomeMethod")]
public string SomeMethod()
{
// add your code
}
}
Map the route:
var config = new HttpConfiguration();
var modelBuilder = new ODataConventionModelBuilder();
modelBuilder.Function("SomeMethod").Returns<string>();
config.MapODataServiceRoute("ODataRoute", "odata/Utilities", modelBuilder.GetEdmModel());