WCF Rest 4.0，动态路由和OutputCache

/languageCode/ServiceName/Method
e.g.
/en/MyService/GetItems

AspNetCacheProfile

VaryByCustom

VaryByCustom

RouteTable.Routes.Add(new CulturedServiceRoute(
    \"devices\", 
    new StructureMapServiceHostFactory(), 
    typeof(DeviceService)));

public override string GetVaryByCustomString(
    HttpContext context, string custom)
{

    // This method gets called twice: Once for the initial request, then a 
    // second time for the rewritten URL. I only want it to be called once!

    if (custom == \"XmlDataFreshness\")
    {
        var outputString = String.Format(\"{0}|{1}|{2}\", 
            XmlDataLoader.LastUpdatedTicks, 
            context.Request.RawUrl, 
            context.Request.HttpMethod);
        return outputString;
    }

    return base.GetVaryByCustomString(context, custom);
}

public class CulturedServiceRoute : RouteBase, IRouteHandler
{
    private readonly string _virtualPath = null;
    private readonly ServiceRoute _innerServiceRoute = null;
    private readonly Route _innerRoute = null;

    public CulturedServiceRoute(
        string pathPrefix, 
        ServiceHostFactoryBase serviceHostFactory, 
        Type serviceType)
    {
        if (pathPrefix.IndexOf(\"{\") >= 0)
        {
            throw new ArgumentException(
                \"Path prefix cannot include route parameters.\", 
                \"pathPrefix\");
        }
        if (!pathPrefix.StartsWith(\"/\")) pathPrefix = \"/\" + pathPrefix;
        pathPrefix = \"{culture}\" + pathPrefix;

        _virtualPath = String.Format(\"Cultured/{0}/\", serviceType.FullName);
        _innerServiceRoute = new ServiceRoute(
            _virtualPath, serviceHostFactory, serviceType);
        _innerRoute = new Route(pathPrefix, this);
    }

    public override RouteData GetRouteData(
        HttpContextBase httpContext)
    {
        return _innerRoute.GetRouteData(httpContext);
    }

    public override VirtualPathData GetVirtualPath(
        RequestContext requestContext, RouteValueDictionary values)
    {
        return null;
    }

    public IHttpHandler GetHttpHandler(RequestContext requestContext)
    {
        // This method is called even if VaryByCustom 
        // returns a duplicate response!

        var culture = requestContext.RouteData.Values[\"culture\"].ToString();
        var ci = new CultureInfo(culture);
        Thread.CurrentThread.CurrentUICulture = ci;
        Thread.CurrentThread.CurrentCulture = 
            CultureInfo.CreateSpecificCulture(ci.Name);

        requestContext.HttpContext.RewritePath(\"~/\" + _virtualPath, true);
        return _innerServiceRoute.RouteHandler.GetHttpHandler(requestContext);
    }
}

[ServiceContract]
[AspNetCompatibilityRequirements(
    RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]
[ServiceBehavior(InstanceContextMode = InstanceContextMode.PerCall)]
public class DeviceService
{
    [AspNetCacheProfile(\"MyCacheProfile\")]
    [WebGet(UriTemplate = \"\")]
    public IEnumerable<DeviceListItemModel> GetDevices()
    {
        // This is called AFTER the first VaryByCustom override is called.
        // I\'d expect it not to be called unless VaryByCustom changes!

        var devices =
            from d in _deviceRepository.GetAll()
            where d.ReleaseDate < DateTime.Now
            orderby d.Id descending
            select new DeviceListItemModel(d);

        return devices;
    }

<caching>
  <outputCacheSettings>
    <outputCacheProfiles>
      <add name=\"MyCacheProfile\" varyByCustom=\"XmlDataFreshness\"
           varyByHeader=\"accept\" varyByParam=\"*\" location=\"Server\"
           duration=\"3600\" />
    </outputCacheProfiles>
  </outputCacheSettings>
</caching>