PathHandler to support more traditional URI route conventions for id references for ODataControllers for V4

gistfile1.txt

/// <summary>
    /// Path handler to switch to using segment notation for collection IDs 
    /// </summary>
    internal class SegmentIdPathHandler : DefaultODataPathHandler
    {
        /// <summary>
        /// Handle URI's using either ID format on the way in to the API
        /// </summary>
        protected override ODataPathSegment ParseAtCollection(IEdmModel model, ODataPathSegment previous, IEdmType previousEdmType, string segment, Queue<string> segments)
        {
            ODataPathSegment retVal = null;
            try
            {
                // If this looks like a custom id.
                if (previousEdmType.TypeKind == EdmTypeKind.Collection && segment[0] != '(')
                {
                    // We allow string ids to index collections as keys, so try forming it up as an index.
                    retVal = base.ParseAtCollection(model, previous, previousEdmType, "(" + segment + ")", segments);
                }
                else // Just use regular parsing.
                {
                    retVal = base.ParseAtCollection(model, previous, previousEdmType, segment, segments);
                }
            }
            catch (ODataException) // Fall back to default parsing if we guessed wrong.
            {
                retVal = base.ParseAtCollection(model, previous, previousEdmType, segment, segments);
            }
            return retVal;
        }

        /// <summary>
        /// Make IDs serialize as segments on the way out of the API.
        /// </summary>
        public override string Link(ODataPath path)
        {
            var stringBuilder = new StringBuilder();
            bool flag = true;
            foreach (ODataPathSegment odataPathSegment in path.Segments)
            {
                if (odataPathSegment != null)
                {
                    if (!flag)
                    {
                        stringBuilder.Append('/');
                    }
                    if (odataPathSegment is KeyValuePathSegment)
                    {
                        // Don't use quotes around ids.
                        var kvSegment = (KeyValuePathSegment)odataPathSegment;
                        stringBuilder.Append(kvSegment.Value.Trim('\''));
                    }
                    else
                    {
                        stringBuilder.Append(odataPathSegment.ToString());
                    }
                    flag = false;
                }
            }
            return ((object)stringBuilder).ToString();
        }
    }
}