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• WCF, ASMX Basic HTTP binding and IIS

  - by Brennan Mann

  Hello, I have been doing a lot of work with WCF "self" hosted applications. I recently was requested to write a web service where the calling client was a Linux based program named "WGET". I would like to use WCF instead of a traditional ASMX web service. The web service is returning a standard XML response. I am not sure of the underlining details between the two technologies but I know WCF is the proper route. I created a WCF service to be hosted in IIS ( using basicHttpBinding). 1.) Did classic ASMX web services ( standard HTTP POST/GET) use SOAP to return responses? I created an class from XSD for the web service response. What is really going on behind the scenes? Is there just special XML HTTP headers that know how to handle to response? Is the response not wrapped in SOAP? The traditional ASMX web service worked perfectly with the class I generated using the .Net "XSD" program. 2.) I want to use WCF for this service. Will using basicHttpBinding work? As I have read, that is the correct binding to use for ASMX clients. Does this use SOAP, standard HTTP headers, or something else? 3.) This is a dumb question because I have not done a lot of web service programming. I noticed on the ASMX default landing page there were examples for responses and code to invoke the functionality. When I create the same service using WCF, I had to create a client application to perform these tasks. Is there a way to expose the WCF endpoint like a classic ASMX service or is the WSDL the only route? As always, I really appreciate the feedback. Thanks, Brennan

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• What is the best way to process XML sent to WCF 3.5

  - by CRM Junkie

  I have to develop a WCF application in 3.5. The input will be sent in the form of XML and the response would be sent in the form of XML as well. A ASP.NET application will be consuming the WCF and sending/receiving data in XML format. Now, as per my understanding, when consuming WCF from an ASP.NET application, we just add a reference to the service, create an object of the service, pack all the necessary data(Data Members in WCF) into the input object (object of the Data Contract) and call the necessary function. It happens that the ASP.NET application is being developed by a separate party and they are hell bent on receiving and sending data in XML format. What I can perceive from this is that the WCF will take the XML string (a single Data Member string type) as input and send out a XML string (again a single Data Member string type) as output. I have created WCF applications earlier where requests and responses were sent out in XML/JSON format when it was consumed by jQuery ajax calls. In those cases, the XML tags were automatically mapped to the different Data Members defined. What approach should I take in this case? Should I just take a string as input (basically the XML string) or is there any way WCF/.NET 3.5 will automatically map the XML tags with the Data Members for requests and responses and I would not need to parse the XML string separately?

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• How to secure a WCF service using NetNamedPipesBinding so that it can only be called by the current

  - by Samuel Jack

  I'm using a WCF service with the NetNamedPipesBinding to communicate between two AppDomains in my process. How do I secure the service so that it is not accessible to other users on the same machine? I have already taken the precaution of using a GUID in the Endpoint Address, so there's a little security through obscurity, but I'm looking for a way of locking the service down using ACL or something similar.

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• What is the best workaround for the WCF client `using` block issue?

  - by Eric King

  I like instantiating my WCF service clients within a using block as it's pretty much the standard way to use resources that implement IDisposable: using (var client = new SomeWCFServiceClient()) { //Do something with the client } But, as noted in this MSDN article, wrapping a WCF client in a using block could mask any errors that result in the client being left in a faulted state (like a timeout or communication problem). Long story short, when Dispose() is called, the client's Close() method fires, but throws and error because it's in a faulted state. The original exception is then masked by the second exception. Not good. The suggested workaround in the MSDN article is to completely avoid using a using block, and to instead instantiate your clients and use them something like this: try { ... client.Close(); } catch (CommunicationException e) { ... client.Abort(); } catch (TimeoutException e) { ... client.Abort(); } catch (Exception e) { ... client.Abort(); throw; } Compared to the using block, I think that's ugly. And a lot of code to write each time you need a client. Luckily, I found a few other workarounds, such as this one on IServiceOriented. You start with: public delegate void UseServiceDelegate<T>(T proxy); public static class Service<T> { public static ChannelFactory<T> _channelFactory = new ChannelFactory<T>(""); public static void Use(UseServiceDelegate<T> codeBlock) { IClientChannel proxy = (IClientChannel)_channelFactory.CreateChannel(); bool success = false; try { codeBlock((T)proxy); proxy.Close(); success = true; } finally { if (!success) { proxy.Abort(); } } } } Which then allows: Service<IOrderService>.Use(orderService => { orderService.PlaceOrder(request); } That's not bad, but I don't think it's as expressive and easily understandable as the using block. The workaround I'm currently trying to use I first read about on blog.davidbarret.net. Basically you override the client's Dispose() method wherever you use it. Something like: public partial class SomeWCFServiceClient : IDisposable { void IDisposable.Dispose() { if (this.State == CommunicationState.Faulted) { this.Abort(); } else { this.Close(); } } } This appears to be able to allow the using block again without the danger of masking a faulted state exception. So, are there any other gotchas I have to look out for using these workarounds? Has anybody come up with anything better?

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• Is there a way that WCF service can know which machine the call comes from?

  - by erxuan

  Hi, I have a WCF service and without changing any code on the client side, is there a way that I can know the detail information of the caller, such as the MachineName, and ApplicationName? Basically, I cannot change the client code to pass those pieces of information over. I tried to use System.Web.HttpContext on the server side to track this information, but HttpContext.Current is NULL. I guess that is not the proper usage of it. Any suggestion? Thanks Sarah

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• What can be done to speed up synchronous WCF calls?

  - by Dimitri C.

  My performance measurements of synchronous WCF calls from within a Silverlight application showed I can make 7 calls/s on a localhost connection, which is very slow. Can this be speeded up, or is this normal? This is my test code: const UInt32 nrCalls = 100; ICalculator calculator = new CalculatorClient(); // took over from the MSDN calculator example for (double i = 0; i < nrCalls; ++i) { var call = calculator.BeginSubtract(i + 1, 1, null, null); call.AsyncWaitHandle.WaitOne(); double result = calculator.EndSubtract(call); } Remarks: CPU load is almost 0%. Apparently, the WCF module is waiting for something. I tested this both on Firefox 3.6 and Internet Explorer 7. I'm using Silverlight v3.0

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• Visual Studio RTM, Silverlight 4 RTM and WCF RIA Services download links

  - by Harish Ranganathan

  Its been a long time since I blogged.  Primarily due to Tech Ed India, the ongoing Great Indian Developer Summit (GIDS 2010) and the related travels.  However, here is a quick post with a few updates.  Visual Studio 2010 RTMed in India during Tech Ed.  We had the privilege of having Soma our Senior VP launch VS 2010 RTM in Bangalore, India, during Tech Ed India 2010.   With that we also had Silverlight 4 getting RTMed during the same week. Earlier I had written posts around using the VS 2010 Beta, RC and the corresponding Silverlight, WCF RIA bits etc., and getting them all to work together.  Now that, both VS 2010 and Silverlight have RTMed, I wanted to post a quick update on the necessary downloads. Visual Studio 2010 RTM can be downloaded from MSDN Visual Studio site  If you are doing Silverlight 4 development with Visual studio, then you can download the Silverlight 4 Tools RC2 for Visual Studio  Then, if you are developing with WCF RIA Services, you can download the WCF RIA Services RC 2 for SL4 and VS 2010 And finally, if you want to use WCF RIA Services in ASP.NET you would require the Domain DataSource control.  Also, to use some of the additional Service Utility tools, you would require the WCF RIA Services Toolkit.  You can download the same from WCF RIA Services Toolkit April 2010 Once you have installed all the above, you should be able to see the following in your add-remove programs WCF RIA Services v1.0 for Visual Studio 2010 (Version 4.0.50401.0) WCF RIA Services Toolkit (Version 4.0.50401.0) Microsoft Silverlight (Version 4.0.50401.0) Microsoft Silverlight 4 SDK (Version 4.0.50401.0) Also, you would need the Expression Blend 4 for designing the apps for Silverlight 4.  You can download the release candidate from here Thats it.  You are all set for development with Visual Studio 2010 and Silverlight 4, WCF RIA Services. Cheers !!!

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• Book Review: Professional WCF 4

  - by Sam Abraham

  My Investigation of WCF internals have set the right stage to revisit Professional WCF 4 by Pablo Cibraro, Kurt Claeys, Fabio Cozzolino and Johann Grabner. In this book, the authors dive deep into all aspects of the WCF API in a reading targeted towards intermediate and advanced developers. Book quality so far as presentation, code completeness, content clarity and organization was superb. The authors have taken a hands-on approach to thoroughly covering the WCF 4.0 API with three chapters totaling 100+ pages completely dedicated to business cases with downloadable source code readily available. Chapter 1 outlines SOA best-practice considerations. Next three chapters take a top-down approach to the WCF API covering service and data contracts, bindings, clients, instancing and Workflow Services followed by another carefully-thought three chapters covering the security options available via the WCF API. In conclusion, Professional WCF 4.0 provides a thorough coverage of the WCF API and is a recommended read for anybody looking to reinforce their understanding of the various features available in the WCF framework. Many thanks to the Wiley/Wrox User Group Program for their support of our West Palm Beach Developers’ Group.   All the best, --Sam

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• Invoking a WCF service using claims based authentication

  - by ashwnacharya

  I have a WCF service deployed in a server machine. We are using claims based authentication to authenticate the WCF service caller. The WCF service is restricted by using IIS Authorization rules. How do I programmatically invoke the WCF service using .NET? The client app uses a proxy generated using SVCUtil. calling the service reads the credentials from a configuration file (not the app.config file, in fact the client application does not have a *.config file).

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• WCF streaming on asmx ?

  - by phenevo

  Hi, I'he got wcf service for wcf straming. I works. But I must integrate it with our webserice. is there any way, to have webmethod like this: [webmethod] public Stream GetStream(string path) { return Iservice.GetStream(path); } I service is a class which I copy from WCF service to my asmx. And is there any way to integrate App.config from wcf with web.config ?

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• Does anybody actually use FaultReasonText to localize faults from WCF services?

  - by urig

  There is a localization mechanism in WCF that enables one to localize faults returned to client, via a FaultReasonText object that's a part of the fault. The way this is done is that you pass all possible translations of the fault's message inside a collection in the FaultReasonText. This, I understand, is based on SOAP v1.2. Does anyone actually use this mechanism? Isn't this wasteful in terms of bandwidth? Why would you send all possible translations to a client that is (probably) only interested in a specific language?

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• How to call WCF Service Method Asycroniously from Class file?

  - by stackuser1

  I've added WCF Service reference to my asp.net application and configured that reference to support asncronious calls. From asp.net code behind files, i'm able to call the service methods asyncroniously like the bellow sample code. protected void Button1_Click(object sender, EventArgs e) { PageAsyncTask pat = new PageAsyncTask(BeiginGetDataAsync, EndDataRetrieveAsync, null, null); Page.RegisterAsyncTask(pat); } IAsyncResult BeiginGetDataAsync(object sender, EventArgs e, AsyncCallback async, object extractData) { svc = new Service1Client(); return svc.BeginGetData(656,async, extractData); } void EndDataRetrieveAsync(IAsyncResult ar) { Label1.Text = svc.EndGetData(ar); } and in page directive added Async="true" In this scenario it is working fine. But from UI i'm not supposed to call the service methods directly. I need to call all service methods from a static class and from code behind file i need to invoke the static method. In this scenario what exactlly do i need to do?

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• How does a website latency simulator work

  - by nighthawk457

  Sites like webpagetest allow users to enter a website url and a test location, to run a speed test on the site from multiple locations using real browsers. Can anyone give me a basic idea of how sites like this work? You also have plugin's like Aptimize latency simulator or charles web debugging proxy app, that simulate the delay while accessing a site from different locations. I am assuming since these are plugin's these function in a different way. How do these plugin's work ?

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• How to test the render speed of my solution in a web browser?

  - by Cuartico

  Ok, I need to test the speed of my solution in a web browser, but I have some problems, there are 2 versions of the web solution, the original one that is on server A and the "fixed" version that is on server B. I have VS2010 Ultimate, so I can make a web and load test on solution B, but I can't load the A solution on my IDE. I was trying to use fiddle2 and jmeter, but they only gave me the times of the request and response of the browsers with the server, I also want the time it takes to the browser to render the whole page. Maybe I'm misusing some of this tools... I don't know if this could be usefull but: Solution A is on VB 6.0 Solution B is on VB.Net Thanks in advance!

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• Unable to host WCF service correctly in IIS7

  - by user206736

  I have a WCF Service library written in .NET 4.0. I have a WCF application (in order to host this service in IIS) within the same solution. It contains the WCF library assembly reference and a service.svc file pointing to the service from the library along with a web.config that is a replica of the WCF service library's app.config. The WCF application is set to host the service in IIS7 (the virtual directory has been set). The same solution contains an ASP.NET Webforms solution to which I have added a service reference pointing to the WCF service I hosted in IIS (as mentioned). When i start an instance of this ASP.NET Web application, I get a message saying that "The WCF service has been hosted" and the ASP.NET application can access the data from it correctly. However, when i try and access this data via a service reference added to an MVC 2 Web Application on the same machine in a different solution (pointing to the service hosted in IIS), I get a "The remote server returned an error: (405) Method Not Allowed." protocol exception . However, the MVC application is able to access the service data if I manually invoke an instance of the WCF Application that I was using to host the WCF Service Library from the other solution. I am using VS2010 Beta 2 as my development IDE. I have been stuck with this issue for a while now. Any help would be appreciated. My service config is as follows:- <system.serviceModel> <services> <service behaviorConfiguration="CruxServices.BasicSearchServiceBehavior" name="CruxServices.BasicSearch.BasicSearch"> <endpoint address="" binding="wsHttpBinding" name="WSBindingEndpoint" bindingConfiguration="WSBindingConfig" contract="CruxServices.BasicSearch.Interfaces.IPropertyListFilter"> <identity> <dns value="localhost" /> </identity> </endpoint> <endpoint address="mex" binding="mexHttpBinding" name="MexEndpoint" contract="IMetadataExchange" /> <host> <baseAddresses> <add baseAddress="http://localhost/CruxServices" /> </baseAddresses> </host> </service> </services> <behaviors> <serviceBehaviors> <behavior name="CruxServices.BasicSearchServiceBehavior"> <serviceMetadata httpGetEnabled="true" /> <serviceDebug includeExceptionDetailInFaults="false" /> </behavior> </serviceBehaviors> </behaviors> <bindings> <wsHttpBinding> <binding name="WSBindingConfig"> <security mode="None"> <transport clientCredentialType="None"/> <message establishSecurityContext="false"/> </security> </binding> </wsHttpBinding> </bindings>

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• What's best performance way to constantly change image on WP7?

  - by AlRodriguez

  I'm trying to make my own type of remote desktop for WP7. I have a WCF service that returns an image on what's on the target machine's screen. Here's the WCF Server Code: // Method to load desktop image Bitmap image = new Bitmap( ViewSize.Width, ViewSize.Height ); Graphics g = Graphics.FromImage( image ); g.CopyFromScreen( Position.X, Position.Y, 0, 0, ViewSize ); g.Dispose( ); return image; // Convert image to byte[] which is returned to client using ( MemoryStream ms = new MemoryStream( ) ) { Bitmap image = screenGrabber.LoadScreenImage( ); image.Save( ms, ImageFormat.Jpeg ); imageArray = ms.ToArray( ); } Here's the code for the WP7 client: MemoryStream stream = new MemoryStream( data ); BitmapImage image = new BitmapImage( ); image.SetSource( stream ); BackgroundImage.Source = image; The BackgroundImage variable is an Image control. I'm noticing this freeze on the emulator after a short while, and will eventually crash from an OutOfMemoryException. This is already pretty slow ( images show up a good half second later than what's on the screen ), and I'm wondering if there's a better/faster way of doing this? Any help would be great. Thanks in advance.

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• AspNetCompatibility in WCF Services &ndash; easy to trip up

  - by Rick Strahl

  This isn’t the first time I’ve hit this particular wall: I’m creating a WCF REST service for AJAX callbacks and using the WebScriptServiceHostFactory host factory in the service: <%@ ServiceHost Language="C#" Service="WcfAjax.BasicWcfService" CodeBehind="BasicWcfService.cs" Factory="System.ServiceModel.Activation.WebScriptServiceHostFactory" %>   to avoid all configuration. Because of the Factory that creates the ASP.NET Ajax compatible format via the custom factory implementation I can then remove all of the configuration settings that typically get dumped into the web.config file. However, I do want ASP.NET compatibility so I still leave in: <system.serviceModel> <serviceHostingEnvironment aspNetCompatibilityEnabled="true"/> </system.serviceModel> in the web.config file. This option allows you access to the HttpContext.Current object to effectively give you access to most of the standard ASP.NET request and response features. This is not recommended as a primary practice but it can be useful in some scenarios and in backwards compatibility scenerios with ASP.NET AJAX Web Services. Now, here’s where things get funky. Assuming you have the setting in web.config, If you now declare a service like this: [ServiceContract(Namespace = "DevConnections")] #if DEBUG [ServiceBehavior(IncludeExceptionDetailInFaults = true)] #endif public class BasicWcfService (or by using an interface that defines the service contract) you’ll find that the service will not work when an AJAX call is made against it. You’ll get a 500 error and a System.ServiceModel.ServiceActivationException System error. Worse even with the IncludeExceptionDetailInFaults enabled you get absolutely no indication from WCF what the problem is. So what’s the problem?  The issue is that once you specify aspNetCompatibilityEnabled=”true” in the configuration you *have to* specify the AspNetCompatibilityRequirements attribute and one of the modes that enables or at least allows for it. You need either Required or Allow: [AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Required)] without it the service will simply fail without further warning. It will also fail if you set the attribute value to NotAllowed. The following also causes the service to fail as above: [AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.NotAllowed)] This is not totally unreasonable but it’s a difficult issue to debug especially since the configuration setting is global – if you have more than one service and one requires traditional ASP.NET access and one doesn’t then both must have the attribute specified. This is one reason why you’d want to avoid using this functionality unless absolutely necessary. WCF REST provides some basic access to some of the HTTP features after all, although what’s there is severely limited. I also wish that ServiceActivation errors would provide more error information. Getting an Activation error without further info on what actually is wrong is pretty worthless especially when it is a technicality like a mismatched configuration/attribute setting like this.© Rick Strahl, West Wind Technologies, 2005-2010Posted in ASP.NET  WCF  AJAX  

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• How do I properly host a WCF Data Service in IIS? Why am I getting errors?

  - by j0rd4n

  I'm playing around with WCF Data Services (ADO.NET Data Services). I have an entity framework model pointed at the AdventureWorks database. When I debug my svc file from within Visual Studio, it works great. I can say /awservice.svc/Customers and get back the ATOM feed I expect. If I publish the service (hosted in an ASP.NET web application) to IIS7, the same query string returns a 500 fault. The root svc page itself works as expected and successfully returns ATOM. The /Customers path fails. Here is what my grants look like in the svc file: public class AWService : DataService<AWEntities> { public static void InitializeService( DataServiceConfiguration config ) { config.SetEntitySetAccessRule( "*", EntitySetRights.All ); config.SetServiceOperationAccessRule( "*", ServiceOperationRights.All ); config.DataServiceBehavior.MaxProtocolVersion = DataServiceProtocolVersion.V2; } } Update: I enabled verbose errors and get the following in the XML message: <innererror> <message>The underlying provider failed on Open.</message> <type>System.Data.EntityException</type> <stacktrace> at System.Data.EntityClient.EntityConnection.OpenStoreConnectionIf( ... ... <internalexception> <message> Login failed for user 'IIS APPPOOL\DefaultAppPool'. </message> <type>System.Data.SqlClient.SqlException</type> <stacktrace> at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, ...

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• RIA Services versus WCF services: what is a difference

  - by Budda

  There are a lot of information how to build Silverlight application using .NET RIA services, but it isn't clear what is unique thing in RIA that is absent in WCF? Here are few topics that are talking around this topic: http://stackoverflow.com/questions/1647225/ria-services-versus-wcf-services http://stackoverflow.com/questions/945123/net-ria-services-wcf-services But they doesn't give an answer to the question. Sorry for the stupid question, but what does "RIA Services" layer bring into your app if you already have "Silverlight <-- WCF Service <-- Business Logic <-- Entity Framework Model <-- Database"? Authentication? Validation? Is it relly asset for you? At the moment the only thing I see: with RIA services usage you don't need to host WCF service manually and don't need to configure any references on the client side (clien side == Silverlight application). Probably I don't know some very useful features of the RIA Services? So could you please point me to the good doc for that? Many thanks.

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• Autofac Wcf Integration Security Problem

  - by ecoffey

  I've created a Wcf Service to back a Ajax page (.Net 3.5). It's hosted in IIS 6.1 Integrated Pipeline. (The rest of Autofac is setup correctly for Web Forms integration). Everything works fine and dandy with the normal Wcf pipeline. However when I plug in the Autofac Wcf Integration (as per the Autofac wiki) I get this delightful exception: [SecurityException: That assembly does not allow partially trusted callers.] Autofac.Integration.Wcf.AutofacHostFactory.CreateServiceHost(String constructorString, Uri[] baseAddresses) in c:\Working\Autofac\src\Source\Autofac.Integration.Wcf\AutofacHostFactory.cs:78 System.ServiceModel.HostingManager.CreateService(String normalizedVirtualPath) +604 System.ServiceModel.HostingManager.ActivateService(String normalizedVirtualPath) +46 System.ServiceModel.HostingManager.EnsureServiceAvailable(String normalizedVirtualPath) +654 My Google-fu has failed me on finding a solution to this problem. Any insights or workarounds would be appreciated.

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• publish XML using WCF

  - by khalil

  Hi, I want to publish some data as XML from a SQL Server database using a WCF service to a location on our content delivery network. (www.somelocation-on-cdn/myxml.xml) This data which is published as XML will have to be updated at an interval of time. I was thinking of writing a WCF service to return the data required, create a RSS reader to update / write the XML file to a location on the content delivery network. Is this approach correct? Can I use WCF REST instead of WCF SOAP As a further enhancement I want to be to use this WCF Service to make cross domain calls using JSONP from our website Thanks

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• WCF via Windows Service - Authenticating Clients

  - by Sean

  I am a WCF / Security Newb. I have created a WCF service which is hosted via a windows service. The WCF service grabs data from a 3rd party data source that is secured via windows authentication. I need to either: Pass the client's privileges through the windows service, through the WCF service and into the 3rd party data source, or... Limit who can call the windows service / WCF service to members of a particular AD group. Any suggestions on how I can do either of these tasks?

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• WCF via Windows Service - Authinticating Clients

  - by Sean

  I am a WCF / Security Newb. I have created a WCF service which is hosted via a windows service. The WCF service grabs data from a 3rd party data source that is secured via windows authentication. I need to either: Pass the client's priveleges through the windows service, through the WCF service and into the 3rd party data source, or... Limit who can call the windows service / wcf service to members of a particular AD group. Any suggestions on how I can do either of these tasks?

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• I need to create a small HMI/SCADA WPF application that uses WCF

  - by HomeMade

  Hello I have to create a simple app, that will suit as an example of using WPF and WCF for creating HMI screens. I'm not sure what WCF is supposed to do in such application, I guess there must be an OPC server that my application connects to. Does app connect to OPC server using WCF service and does the WCF service reside inside the application or outside? Is WCF service meant to be used only as a connection to OPC server? I'm not yet quite sure which process to simulate, I need something simple. Please, any ideas are welcomed. Thank you

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• Using WCF authentication service for web application

  - by user200295

  I am using a WCF authentication service I set up with a web application. I have successfully set up and tested the AuthenticationService and RolesService. The web application can successfully call methods like ValidateUser and GetRolesForCurrentUser through the WCF services. I want to integrate the WCF authentication service with my web.config and site.map. Do I need to write a custom provider, or is there some way I can modify the web.config of the web application to use the WCF authentication service as its membership provider? This way I can set what roles have access to what directories based off the WCF authentication service.

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