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I've updated from Microsoft.AspNet.OData version 6.0.0 to OData version 7.0.1. The upgrade has broken my ability to get the Id from a path when linking one object to another. Here is my Web API call to add a role to a specific user using the OData standard:

POST: http://localhost:61506/odata/users('bob')/roles/$ref
Request body: "@odata.id":"http://localhost:61506/odata/roles(1)"

The Web API method verifies the user and then makes a call to Helpers.GetKeyFromUri to get the role Id value from the request body.

[HttpPost, HttpPut]
public IHttpActionResult CreateRef([FromODataUri] string key, string navigationProperty, [FromBody] Uri link)

 // Ensure the User exists
 User user = new User().GetById(key);
 if (user == null)
 
 return NotFound();
 

 // Determine which navigation property to use
 switch (navigationProperty)
 
 case "roles":
 // Get the Role id
 int roleId;
 try
 
 roleId = Helpers.GetKeyFromUri<int>(Request, link);
 
 catch (Exception ex)
 
 return BadRequest();
 

 // Ensure the Role exists
 Role role = new Role().GetById(roleId);
 if (role == null)
 
 return NotFound();
 

 // Add the User/Role relationship
 user.Roles.Add(role);
 user.Update();

 break;

 default:
 return StatusCode(HttpStatusCode.NotImplemented);
 

 return StatusCode(HttpStatusCode.NoContent);

That function looks like this (Originally from here but with updated references: https://github.com/OData/ODataSamples/blob/master/RESTier/Trippin/Trippin/Helpers.cs)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http;
using System.Web.Http.Routing;
using Microsoft.AspNet.OData.Extensions;
using Microsoft.AspNet.OData.Routing;
using Microsoft.OData.UriParser;

namespace Project1.Extensions

 public class Helpers
 
 public static TKey GetKeyFromUri<TKey>(HttpRequestMessage request, Uri uri)
 
 if (uri == null)
 
 throw new ArgumentNullException("uri");
 

 var urlHelper = request.GetUrlHelper() ?? new UrlHelper(request);

 var pathHandler = (IODataPathHandler)request.GetRequestContainer().GetService(typeof(IODataPathHandler));

 string serviceRoot = urlHelper.CreateODataLink(
 request.ODataProperties().RouteName,
 pathHandler, new List<ODataPathSegment>());
 var odataPath = pathHandler.Parse(serviceRoot, uri.LocalPath, request.GetRequestContainer());

 var keySegment = odataPath.Segments.OfType<KeySegment>().FirstOrDefault();
 if (keySegment == null)
 
 throw new InvalidOperationException("The link does not contain a key.");
 

 var value = keySegment.Keys.FirstOrDefault().Value;
 return (TKey)value;
 
 

This line of code is now throwing the following error: Resource not found for the segment 'odata'

var odataPath = pathHandler.Parse(serviceRoot, uri.LocalPath, request.GetRequestContainer());

This worked fine when using OData 6.0.0 but fails in 7.0.1. It seems to have some sort of issue parsing my odata segment or not being able to find it at all. Here is my routing setup if it helps:

public static void Register(HttpConfiguration config)

 // Setup the OData routes and endpoints
 config.MapODataServiceRoute(
 routeName: "ODataRoute",
 routePrefix: "odata",
 model: GetEdmModel());

 // Enable OData URL querying globally
 config.Count().Filter().Select().OrderBy().Expand().MaxTop(null);