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POHow does one set the location header to a UriTemplate of another service in WCF 4.0 REST without magic strings?
 

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  1. POHow does one set the location header to a UriTemplate of another service in WCF 4.0 REST without magic strings?
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    <p>Consider the following two WCF 4.0 REST services:</p> <pre><code>[ServiceContract] [AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)] [ServiceBehavior(InstanceContextMode = InstanceContextMode.PerCall)] public class WorkspaceService { [WebInvoke(UriTemplate = "{id}/documents/{name}", Method = "POST")] public Document CreateWorkspaceDocument(Stream stream, string id, string name) { /* CreateDocument is omitted as it isn't relevant to the question */ Document response = CreateDocument(id, name, stream); /* set the location header */ SetLocationHeader(response.Id); } private void SetLocationHeader(string id) { Uri uri = new Uri("https://example.com/documents/" + id); WebOperationContext.Current.OutgoingResponse.SetStatusAsCreated(uri); } /* methods to delete, update etc */ } [ServiceContract] [AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)] [ServiceBehavior(InstanceContextMode = InstanceContextMode.PerCall)] public class DocumentService { [WebGet(UriTemplate = "{id}")] public Document GetDocument(string id) { } /* methods to delete, update etc */ } </code></pre> <p>In essence, when someone creates a document in a workspace, the Location header is set to the location of the document, which is essentially is the same as invoking the <code>DocumentService.GetDocument</code> operation.</p> <p>My global.asax looks as follows:</p> <pre><code>public class Global : HttpApplication { private void Application_Start(object sender, EventArgs e) { RegisterRoutes(); } private void RegisterRoutes() { var webServiceHostFactory = new WebServiceHostFactory(); RouteTable.Routes.Add(new ServiceRoute("workspaces", webServiceHostFactory, typeof (WorkspaceService))); RouteTable.Routes.Add(new ServiceRoute("documents", webServiceHostFactory, typeof (DocumentService))); /* other services */ } } </code></pre> <p>The implementation of <code>WorkspaceService.SetLocationHeader</code> as it makes some assumptions about how routing was setup. If I was to change the route of <code>DocumentService</code> then the resulting Uri will be incorrect. If I changed the UriTemplate of <code>DocumentService.GetDocument</code>, then the resulting Uri will be incorrect too.</p> <p>If WorkspaceService and DocumentService was merged into one service, I could have written <code>SetLocationHeader</code> as follows:</p> <pre><code>var itemTemplate = WebOperationContext.Current.GetUriTemplate("GetDocument"); var uri = itemTemplate.BindByPosition(WebOperationContext.Current.IncomingRequest.UriTemplateMatch.BaseUri, id); WebOperationContext.Current.OutgoingResponse.SetStatusAsCreated(uri); </code></pre> <p>How would one write <code>WorkspaceService.SetLocationHeader</code> such that it will use the routing table defined in Global.asax and UriTemplates to return the Uri for the GetDocument operation of the DocumentService? </p> <p>I'm using plain old WCF 4.0 (not the WCF Web API).</p>
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