System.Web.Routing.RouteCollectionExtensions.GetConstraints C# (CSharp) Method

        private static RouteValueDictionary GetConstraints(RouteConfigurationElement route)
        {
            try
            {
                var dictionary = GetDictionaryFromAttributes(route.Constraints.Attributes);

                for (var i = 0; i < route.Constraints.Count; i++)
                {
                    var constraint = route.Constraints[i];
                    var routeConstraintType = Type.GetType(constraint.Type);

                    IRouteConstraint routeConstraint;
                    if (constraint.Params.Attributes.Count > 0)
                    {
                        var parameters = constraint.Params.Attributes.Values.ToArray();
                        routeConstraint = (IRouteConstraint)Activator.CreateInstance(routeConstraintType, parameters);
                    }
                    else
                        routeConstraint = (IRouteConstraint)Activator.CreateInstance(routeConstraintType);

                    dictionary.Add(constraint.Name, routeConstraint);
                }

                return dictionary;
            }
            catch (Exception ex)
            {
                var message = String.Format("Can't create an instance of IRouteHandler {0}", route.RouteHandlerType);
                throw new ApplicationException(message, ex);
            }
        }