bryanoconnell.blogspot.com - Easily expose metadata information from Web API

WebApiConfig.cs

// Written by Bryan O'Connell, June 2015
// http://bryanoconnell.blogspot.com/2015/08/easily-expose-metadata-info-from-webapi.html
// Purpose: Example of how to configure routes to expose metadata information 
// about specific objects in your API.

using System;
using System.Web.Http;
using System.Web.Http.OData.Builder;
using System.Web.Http.OData.Extensions;

using Microsoft.Data.Edm;

// NOTE: You'll need to add 'using' statements here to include the Models 
// to be mapped below.

namespace BOC.SampleAPI
{
    public static class WebApiConfig
    {
        public static void Register(HttpConfiguration config)
        {
            // Web API routes
            config.MapHttpAttributeRoutes();

            config.Routes.MapHttpRoute(
                name: "DefaultApi",
                routeTemplate: "{controller}/{id}",
                defaults: new { id = RouteParameter.Optional }
            );

            // Step 1 - Convert your Class into an EDM Model.
            var ModelOf_SomeClass = BuildModel<SomeClass>("SomeClass");

            // Step 2 - Create a new route that will return metadata information about the Model.
            config.Routes.MapODataServiceRoute(
                "Metadata-SomeClass",   // Friendly name for the new route (not externally visible)
                "Entities/SomeClass",   // URI for the new route
                ModelOf_SomeClass       // Model to expose
            );

            // The following should now return metadata information for the specified Model:
            //  - http://yourapi.com/Entities/SomeClass/$metadata

            // Step 3 - Repeat this for each Class for which you want to expose metadata information.
        }

        // Converts a Class into an EDM Model.
        private static IEdmModel BuildModel<T>(string EntityName) where T : class 
        {
            ODataConventionModelBuilder ODataBuilder = new ODataConventionModelBuilder();
            ODataBuilder.EntitySet<T>(EntityName);
            return ODataBuilder.GetEdmModel();
        }
    }
}