Question

I need to create a custom route for a WCF data service that contains a segment that must be extracted for use in filtering data.

Example:

http://mysample.net/mysamplesvc/client123/Users

I need to extract the client123 from the route. It looks like the Route class might provide something similar but I am not sure how to implement an IRouteHandler for a Data service.

Is this the correct path? Are there good examples around?

TIA!

UPDATE:

I have managed to achieve the solution I needed via some custom URL re-writing in the IDispatchMessageInspector. The below code is my initial hack and needs a bunch of clean-up. but, it appears to be working. If anybody sees anything galringly wrong, please let me know.

    public object AfterReceiveRequest(ref System.ServiceModel.Channels.Message request, IClientChannel channel, InstanceContext instanceContext)
    {
        HttpRequestMessageProperty httpmsg = (HttpRequestMessageProperty)request.Properties[HttpRequestMessageProperty.Name];
        ...Additional logic for handling Query formats in OData


        UriTemplate template = new UriTemplate("mysamplesvc/{ClientId}", true);

        Uri prefix = new Uri(HttpContext.Current.Request.Url.GetLeftPart(UriPartial.Authority));
        Uri uri = new Uri(HttpContext.Current.Request.Url.AbsoluteUri);
        UriTemplateMatch results = template.Match(prefix, uri);

        if (results != null && !string.IsNullOrEmpty(results.BoundVariables["ClientId"]))
        {
            _clientId = results.BoundVariables["clientId"].ToString();
        }

        if (!string.IsNullOrEmpty(_clientId))
        {
            httpmsg.Headers.Add("ClientId", _clientId);
            rewriteRequest();
        }
        return null;
    }

    private void rewriteRequest()
    {
        if (HttpContext.Current != null && HttpContext.Current.Session != null)
        {
            if (WebOperationContext.Current.IncomingRequest.UriTemplateMatch != null)
            {
                Uri serviceUri = HttpContext.Current.Session["ServiceUri"] as Uri;
                Uri requestUri = null;

                UriTemplateMatch match = WebOperationContext.Current.IncomingRequest.UriTemplateMatch;

                if (serviceUri == null)
                {
                    UriBuilder serviceUriBuilder = new UriBuilder(match.BaseUri);

                    serviceUri = serviceUriBuilder.Uri;
                    HttpContext.Current.Session["ServiceUri"] = serviceUri;
                }

                if (serviceUri != null)
                {
                    OperationContext.Current.IncomingMessageProperties["MicrosoftDataServicesRootUri"] = serviceUri;

                    UriBuilder requestUriBuilder = new UriBuilder(match.RequestUri);
                    string path = string.Empty;
                    if (match.RelativePathSegments[0] == _clientId)
                    {
                        foreach (var seg in match.RelativePathSegments.Select((x, i) => new { Value = x, Index = i }))
                        {
                            if (seg.Index != 0)
                            {
                                path += "/";
                                path += seg.Value;
                            }
                        }
                    }
                    else
                    {
                        foreach (var seg in match.RelativePathSegments.Select((x, i) => new { Value = x, Index = i }))
                        {
                            path += "/";
                            path += seg.Value;
                        }
                    }

                    UriBuilder serviceUriBuilder = new UriBuilder(match.BaseUri + path);

                    // because we have overwritten the Root URI, we need to make sure the request URI shares the same host
                    // (sometimes we have request URI resolving to a different host, if there are firewall re-directs
                    serviceUriBuilder.Host = serviceUri.Host;

                    requestUri = serviceUriBuilder.Uri;
                    OperationContext.Current.IncomingMessageProperties["MicrosoftDataServicesRequestUri"] = requestUri;
                    OperationContext.Current.IncomingMessageProperties["Via"] = requestUri;
                }
            }

        }
    }

Thanks all!

Answer 1

I’m assuming this is a MVC project

the typical routes in MVC, I believe, work like this:

//url looks like /controller/Details/42
public ViewResult Details(int id) {
  //do something
}

You can add custom routes like this:

routes.MapRoute(
           "my special little route", // Route name
           "customer/{Cid}/programs/{Pid}",
           new { controller = "customer", action = "Details" }
       );

so the view then looks like:

//url looks like /customer/{21}/programs/42
public ViewResult Details(int Cid, int Pid) {
  //do something
}

so you should, in theory, be able to do that to your WCF service. Unless I’m completely misunderstanding what you’re saying at which I will happily try to update my answer