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• How to synchronize Silverlight clients with WCF?

  - by user564226

  Hi, this is probably only some conceptual problem, but I cannot seem to find the ideal solution. I'd like to create a Silverlight client application that uses WCF to control a third party application via some self written webservice. If there is more than one Silverlight client, all clients should be synchronized, i.e. parameter changes from one client should be propagated to all clients. I set up a very simple Silverlight GUI that manipulates parameters which are passed to the server (class inherits INotifyPropertyChanged): public double Height { get { return frameworkElement.Height; } set { if (frameworkElement.Height != value) { frameworkElement.Height = value; OnPropertyChanged("Height", value); } } } OnPropertyChanged is responsible for transferring data. The WCF service (duplex net.tcp) maintains a list of all clients and as soon as it receives a data packet (XElement with parameter change description) it forwards this very packet to all clients but the one the packet was received from. The client receives the package, but now I'm not sure, what's the best way to set the property internally. If I use "Height" (see above) a new change message would be generated and sent to all other clients a.s.o. Maybe I could use the data field (frameworkElement.Height) itself or a function - but I'm not sure whether there would arise problems with data binding later on. Also I don't want to simply copy parts of the code properties, to prevent bugs with redundant code. So what would you recommend? Thanks!

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• WCF - "Encountered unexpected character 'c'."

  - by Villager

  Hello, I am trying to do something that I thought would be simple. I need to create a WCF service that I can post to via JQuery. I have an operation in my WCF service that is defined as follows: [OperationContract] [WebInvoke(Method = "POST", BodyStyle = WebMessageBodyStyle.WrappedRequest, RequestFormat=WebMessageFormat.Json, ResponseFormat=WebMessageFormat.Json)] public string SendMessage(string message, int urgency) { try { // Do stuff return "1"; // 1 represents success } catch (Exception) { return "0"; } } I then try to access this operation from an ASP.NET page via JQuery. My JQuery code to access this operation looks like the following: function sendMessage(message) { $.ajax({ url: "/resources/services/myService.svc/SendMessage", type: "POST", contentType: "application/json; charset=utf-8", data: ({ message: message, urgency: '1' }), dataType: "json", success: function (data) { alert("here!"); }, error: function (req, msg, obj) { alert("error: " + req.responseText); } }); } When I execute this script, the error handler is tripped. In it, I receive an error that says: "Encountered unexpected character 'c'." This message is included with a long stack trace. My question is, what am I doing wrong? I have received other posts such as this one (http://stackoverflow.com/questions/320291/how-to-post-an-array-of-complex-objects-with-json-jquery-to-asp-net-mvc-controll) without any luck. How do I get this basic interaction working? Thank you!

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• What to pass parameters to start an workflow through WCF

  - by Rubens Farias

  It's possible to define some start values to an workflow using WorkflowInstance.CreateWorkflow, like this: using(WorkflowRuntime runtime = new WorkflowRuntime()) { Dictionary<string, object> parameters = new Dictionary<string, object>(); parameters.Add("First", "something"); parameters.Add("Second", 42); WorkflowInstance instance = runtime.CreateWorkflow(typeof(MyStateMachineWorkflow), parameters); instance.Start(); waitHandle.WaitOne(); } This way, a MyStateMachineWorkflow instance is created and First and Second public properties gets that dictionary values. But I'm using WCF; so far, I managed to create a Start method which accepts that two arguments and I set that required fields by using bind on my ReceiveActivity: using (WorkflowServiceHost host = new WorkflowServiceHost(typeof(MyStateMachineWorkflow))) { host.Open(); ChannelFactory<IMyStateMachineWorkflow> factory = new ChannelFactory<IMyStateMachineWorkflow>("MyStateMachineWorkflow"); IMyStateMachineWorkflow proxy = factory.CreateChannel(); // set this values through binding on my ReceiveActivity proxy.Start("something", 42); } While this works, that create an anomaly: that method should be called only and exactly once. How can I start an workflow instance through WCF passing those arguments? On my tests, I just actually interact with my workflow through wire after I call that proxy method. Is there other way?

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• EF4 + STE: Reattaching via a WCF Service? Using a new objectcontext each and every time?

  - by Martin

  Hi there, I am planning to use WCF (not ria) in conjunction with Entity Framework 4 and STE (Self tracking entitites). If i understnad this correctly my WCF should return an entity or collection of entities (using LIST for example and not IQueryable) to the client (in my case silverlight) The client then can change the entity or update it. At this point i believe it is self tracking???? This is where i sort of get a bit confused as there are a lot of reported problems with STEs not tracking.. Anyway... Then to update i just need to send back the entity to my WCF service on another method to do the update. I should be creating a new OBJECTCONTEXT everytime? In every method? If i am creaitng a new objectcontext everytime in everymethod on my WCF then don't i need to re-attach the STE to the objectcontext? So basically this alone wouldn't work?? using(var ctx = new MyContext()) { ctx.Orders.ApplyChanges(order); ctx.SaveChanges(); } Or should i be creating the object context once in the constructor of the WCF service so that 1 call and every additional call using the same wcf instance uses the same objectcontext? I could create and destroy the wcf service in each method call from the client - hence creating in effect a new objectcontext each time. I understand that it isn't a good idea to keep the objectcontext alive for very long. Any insight or information would be gratefully appreciated thanks

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• Implementing client callback functionality in WCF

  - by PoweredByOrange

  The project I'm working on is a client-server application with all services written in WCF and the client in WPF. There are cases where the server needs to push information to the client. I initially though about using WCF Duplex Services, but after doing some research online, I figured a lot of people are avoiding it for many reasons. The next thing I thought about was having the client create a host connection, so that the server could use that to make a service call to the client. The problem however, is that the application is deployed over the internet, so that approach requires configuring the firewall to allow incoming traffic and since most of the users are regular users, that might also require configuring the router to allow port forwarding, which again is a hassle for the user. My third option is that in the client, spawns a background thread which makes a call to the GetNotifications() method on server. This method on the server side then, blocks until an actual notification is created, then the thread is notified (using an AutoResetEvent object maybe?) and the information gets sent to the client. The idea is something like this: Client private void InitializeListener() { Task.Factory.StartNew(() => { while (true) { var notification = server.GetNotifications(); // Display the notification. } }, CancellationToken.None, TaskCreationOptions.LongRunning, TaskScheduler.Default); } Server public NotificationObject GetNotifications() { while (true) { notificationEvent.WaitOne(); return someNotificationObject; } } private void NotificationCreated() { // Inform the client of this event. notificationEvent.Set(); } In this case, NotificationCreated() is a callback method called when the server needs to send information to the client. What do you think about this approach? Is this scalable at all?

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• Why are we getting a WCF "Framing error" on some machines but not others

  - by Ian Ringrose

  We have just found we are getting “framing errors” (as reported by the WCF logs) when running our system on some customer test machine. It all works ok on our development machines. We have an abstract base class, with KnownType attributes for all its sub classes. One of it’s subclass is missing it’s DataContract attribute. However it all worked on our test machine! On the customers test machine, we got “framing error” showing up the WCF logs, this is not the error message I have seen in the past when missing a DataContract attribute, or a KnownType attribute. I wish to get to the bottom of this, as we can no longer have confidence in our ability to test the system before giving it to the customer until we can make our machines behave the some as the customer’s machines. Code that try to show what I am talking about, (not the real code) [DataContract()] [KnownType(typeof(SubClass1))] [KnownType(typeof(SubClass2))] // other subclasses with data members public abstract class Base { [DataMember] public int LotsMoreItemsThenThisInRealLife; } /// <summary> /// This works on some machines (not not others) when passed to Contract::DoIt, /// note the missing [DataContract()] /// </summary> public class SubClass1 : Base { // has no data members } /// <summary> /// This works in all cases when passed to Contract::DoIt /// </summary> [DataContract()] public class SubClass2 : Base { // has no data members } public interface IContract { void DoIt(Base[] items); } public static class MyProgram { public static IContract ConntectToServerOverWCF() { // lots of code ... return null; } public static void Startup() { IContract server = ConntectToServerOverWCF(); // this works all of the time server.DoIt(new Base[]{new SubClass2(){LotsMoreItemsThenThisInRealLife=2}}); // this works "in develperment" e.g. on our machines, but not on the customer's test machines! server.DoIt(new Base[] { new SubClass1() { LotsMoreItemsThenThisInRealLife = 2 } }); } }

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• WCF - Return object without serializing?

  - by Mayo

  One of my WCF functions returns an object that has a member variable of a type from another library that is beyond my control. I cannot decorate that library's classes. In fact, I cannot even use DataContractSurrogate because the library's classes have private member variables that are essential to operation (i.e. if I return the object without those private member variables, the public properties throw exceptions). If I say that interoperability for this particular method is not needed (at least until the owners of this library can revise to make their objects serializable), is it possible for me to use WCF to return this object such that it can at least be consumed by a .NET client? How do I go about doing that? Update: I am adding pseudo code below... // My code, I have control [DataContract] public class MyObject { private TheirObject theirObject; [DataMember] public int SomeNumber { get { return theirObject.SomeNumber; } // public property exposed private set { } } } // Their code, I have no control public class TheirObject { private TheirOtherObject theirOtherObject; public int SomeNumber { get { return theirOtherObject.SomeOtherProperty; } set { // ... } } } I've tried adding DataMember to my instance of their object, making it public, using a DataContractSurrogate, and even manually streaming the object. In all cases, I get some error that eventually leads back to their object not being explicitly serializable.

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• IIS publish of WCF service -- fails with no error message

  - by tavistmorph

  I havea WCF service which I publish from Visual Studio 2008 to an IIS 6. According to the output window of VS, the publish succeeded, no error messages or warnings. When I look at IIS, the virtual directory was created, but there is no .svc listed in the directory. The directory just has my web.config and a bin. Any attempts to call my WCF service fail cause they don't exist. How can I see an error message of what's going wrong? By trial-and-error, I discovered changing my app.config before publishing will make the service show up. Namely my app.config file has these lines: <binding ...> <security mode="Transport"> <transport clientCreditionalType="None"/> </security> </binding> If I switch "Transport" to "None", then my service shows up on IIS. But I do have a certificate installed on IIS on the server, and as far as I can tell, everything is configured correctly on the server. There is no error message in the event log. How can I get a find more error messages about why the service is failing to show up?

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• Windows service (hosting WCF service) stops immediately on start up

  - by Thr33Dii

  My Question: I cannot navigate to the base address once the service is installed because the service won't remain running (stops immediately). Is there anything I need to do on the server or my machine to make the baseAddress valid? Background: I'm trying to learn how to use WCF services hosted in Windows Services. I have read several tutorials on how to accomplish this and it seems very straight forward. I've looked at this MSDN article and built it step-by-step. I can install the service on my machine and on a server, but when I start the service, it stops immediately. I then found this tutorial, which is essentially the same thing, but it contains some clients that consume the WCF service. I downloaded the source code, compiled, installed, but when I started the service, it stopped immediately. Searching SO, I found a possible solution that said to define the baseAddress when instantiating the ServiceHost, but that didnt help either. My serviceHost is defined as: serviceHost = new ServiceHost( typeof( CalculatorService ), new Uri( "http://localhost:8000/ServiceModelSamples/service" ) ); My service name, base address, and endpoint: <service name="Microsoft.ServiceModel.Samples.CalculatorService" behaviorConfiguration="CalculatorServiceBehavior"> <host> <baseAddresses> <add baseAddress="http://localhost:8000/ServiceModelSamples/service"/> </baseAddresses> </host> <endpoint address="" binding="wsHttpBinding" contract="Microsoft.ServiceModel.Samples.ICalculator"/> <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange"/> </service> I've verified the namespaces are identical. It's just getting frustrating that the tutorials seem to assume that the Windows service will start as long as all the stated steps are followed. I'm missing something and it's probably right in front of me. Please help!

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• Maintaining ViewModel fields with default model binding and failed validation

  - by TonE

  I have an ASP.Net MVC Controller with a 'MapColumns' action along with a corresponding ViewModel and View. I'm using the defaultModelBinder to bind a number of drop down lists to a Dictionary in the ViewModel. The view model also contains an IList field for both source and destination columns which are used to render the view. My question is what to do when validation fails on the Post call to the MapColumns action? Currently the MapColumns view is returned with the ViewModel resulting from the default binding. This contains the Dictionary values but not the two lists used to render the page. What is the best way to re-provide these to the view? I can set them explicitly after failed validation, but if obtaining these values (via GetSourceColumns() and GetDestinationColumns() in the example) carries any overhead this doesn't seem ideal. What I am looking for is a way to retain these lists when they are not bound to the model from the view. Here is some code to illustrate: public class TestViewModel { public Dictionary<string, string> ColumnMappings { get; set; } public List<string> SourceColumns; public List<string> DestinationColumns; } public class TestController : Controller { [AcceptVerbs(HttpVerbs.Get)] public ActionResult MapColumns() { var model = new TestViewModel; model.SourceColumns = GetSourceColumns(); model.DestinationColumns = GetDestinationColumns(); return View(model); } [AcceptVerbs(HttpVerbs.Post)] public ActionResult MapColumns(TestViewModel model) { if( Validate(model) ) { // Do something with model.ColumnMappings RedirectToAction("Index"); } else { // Here model.SourceColumns and model.DestinationColumns are empty return View(model); } } } The relevant section of MapColumns.aspx: <% int columnCount = 0; foreach(string column in Model.targetColumns) {%> <tr> <td> <input type="hidden" name="ColumnMappings[<%= columnCount %>].Value" value="<%=column %>" /> <%= Html.DropDownList("ColumnMappings[" + columnCount + "].Key", Model.DestinationColumns.AsSelectItemList())%> </td> </tr> <% columnCount++; }%>

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• Add custom param to odata url

  - by Toad

  I want to add some authentication to my odata service. The authorization token i want to include in the url as param so that the url can be used in excel How would one be able to receive and parse any addition param supplied in the url before the odata service does it's thing? (i'm using entitie framework and wcf dataservices)

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• Accessing Identity.AuthenticationType

  - by Tewr

  While implementing a custom authentication type in a wcf service, I'm trying to read the property IIdentity.AuthenticationType using the call Thread.CurrentPrincipal.Identity.AuthenticationType. Unless the account running the service is local administrator, UnauthorizedAccessException is thrown when accessing this property, much like described in this support thread. I can however reset the Thread.CurrentPrincipalobject without hassle, thus altering the Authentication Type - But read it, I cannot. Is running as an administrator the only way here or is there some trick to let the user running the service "just" access this property?

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• Get metadata out of a webHttpBinding endpoint

  - by decyclone

  Hi, With a reference to my previous question, I would like to know how would I extract information of a WCF service from a client application to know what methods/types are exposed if the service exposes only one endpoint that uses webHttpBinding? Just to summarize, in my previous question, I came to know that an endpoint using webHttpBinding does not get exposed in the generated WSDL because it would be a JSON endpoint and is just not compatible.

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• How to consume PHP SOAP service using WCF

  - by mr.b

  I am new in web services so apologize me if I am making some cardinal mistake here, hehe. I have built SOAP service using PHP. Service is SOAP 1.2 compatible, and I have WSDL available. I have enabled sessions, so that I can track login status, etc. I don't need some super security here (ie message-level security), all I need is transport security (HTTPS), since this service will be used infrequently, and performances are not so much of an issue. I am having difficulties making it to work at all. C# throws some unclear exception ("Server returned an invalid SOAP Fault. Please see InnerException for more details.", which in turn says "Unbound prefix used in qualified name 'rpc:ProcedureNotPresent'."), but consuming service using PHP SOAP client behaves as expected (including session and all). So far, I have following code. note: due to amount of real code, I am posting minimal code configuration PHP SOAP server (using Zend Soap Server library), including class(es) exposed via service: <?php class Verification_LiteralDocumentProxy { protected $instance; public function __call($methodName, $args) { if ($this->instance === null) { $this->instance = new Verification(); } $result = call_user_func_array(array($this->instance, $methodName), $args[0]); return array($methodName.'Result' => $result); } } class Verification { private $guid = ''; private $hwid = ''; /** * Initialize connection * * @param string GUID * @param string HWID * @return bool */ public function Initialize($guid, $hwid) { $this->guid = $guid; $this->hwid = $hwid; return true; } /** * Closes session * * @return void */ public function Close() { // if session is working, $this->hwid and $this->guid // should contain non-empty values } } // start up session stuff $sess = Session::instance(); require_once 'Zend/Soap/Server.php'; $server = new Zend_Soap_Server('https://www.somesite.com/api?wsdl'); $server->setClass('Verification_LiteralDocumentProxy'); $server->setPersistence(SOAP_PERSISTENCE_SESSION); $server->handle(); WSDL: <definitions xmlns="http://schemas.xmlsoap.org/wsdl/" xmlns:tns="https://www.somesite.com/api" xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap-enc="http://schemas.xmlsoap.org/soap/encoding/" xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/" name="Verification" targetNamespace="https://www.somesite.com/api"> <types> <xsd:schema targetNamespace="https://www.somesite.com/api"> <xsd:element name="Initialize"> <xsd:complexType> <xsd:sequence> <xsd:element name="guid" type="xsd:string"/> <xsd:element name="hwid" type="xsd:string"/> </xsd:sequence> </xsd:complexType> </xsd:element> <xsd:element name="InitializeResponse"> <xsd:complexType> <xsd:sequence> <xsd:element name="InitializeResult" type="xsd:boolean"/> </xsd:sequence> </xsd:complexType> </xsd:element> <xsd:element name="Close"> <xsd:complexType/> </xsd:element> </xsd:schema> </types> <portType name="VerificationPort"> <operation name="Initialize"> <documentation> Initializes connection with server</documentation> <input message="tns:InitializeIn"/> <output message="tns:InitializeOut"/> </operation> <operation name="Close"> <documentation> Closes session between client and server</documentation> <input message="tns:CloseIn"/> </operation> </portType> <binding name="VerificationBinding" type="tns:VerificationPort"> <soap:binding style="document" transport="http://schemas.xmlsoap.org/soap/http"/> <operation name="Initialize"> <soap:operation soapAction="https://www.somesite.com/api#Initialize"/> <input> <soap:body use="literal"/> </input> <output> <soap:body use="literal"/> </output> </operation> <operation name="Close"> <soap:operation soapAction="https://www.somesite.com/api#Close"/> <input> <soap:body use="literal"/> </input> <output> <soap:body use="literal"/> </output> </operation> </binding> <service name="VerificationService"> <port name="VerificationPort" binding="tns:VerificationBinding"> <soap:address location="https://www.somesite.com/api"/> </port> </service> <message name="InitializeIn"> <part name="parameters" element="tns:Initialize"/> </message> <message name="InitializeOut"> <part name="parameters" element="tns:InitializeResponse"/> </message> <message name="CloseIn"> <part name="parameters" element="tns:Close"/> </message> </definitions> And finally, WCF C# consumer code: [ServiceContract(SessionMode = SessionMode.Required)] public interface IVerification { [OperationContract(Action = "Initialize", IsInitiating = true)] bool Initialize(string guid, string hwid); [OperationContract(Action = "Close", IsInitiating = false, IsTerminating = true)] void Close(); } class Program { static void Main(string[] args) { WSHttpBinding whb = new WSHttpBinding(SecurityMode.Transport, true); ChannelFactory<IVerification> cf = new ChannelFactory<IVerification>( whb, "https://www.somesite.com/api"); IVerification client = cf.CreateChannel(); Console.WriteLine(client.Initialize("123451515", "15498518").ToString()); client.Close(); } } Any ideas? What am I doing wrong here? Thanks!

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• Installing .NET 3.5 SP1 on server broke WCF

  - by Doron

  I installed .NET 3.5 SP1 on server which previously had .NET 3.0 SP2. Before install site was working perfectly. After install and subsequeny server restart, site displays but anything that makes use of the WCF service has stopped working. The exception log reports exceptions like the following when any calls are made to the client proxy: The communication object, System.ServiceModel.Channels.ServiceChannel, cannot be used for communication because it is in the Faulted state. The server's application event log gave the following errors after the install: Configuration section system.serviceModel.activation already exists in c:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Config\machine.config. Configuration section system.runtime.serialization already exists in c:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Config\machine.config. Configuration section system.serviceModel already exists in c:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Config\machine.config. which seems to be inline with the fact that anything WCF related has stopped working. I am not experienced in server configurations or WCF so looking for any assistance with this. Thanks!! From machine.config: <sectionGroup name="system.serviceModel" type="System.ServiceModel.Configuration.ServiceModelSectionGroup, System.ServiceModel, Version=3.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"> <section name="behaviors" type="System.ServiceModel.Configuration.BehaviorsSection, System.ServiceModel, Version=3.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"/> <section name="bindings" type="System.ServiceModel.Configuration.BindingsSection, System.ServiceModel, Version=3.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"/> <section name="client" type="System.ServiceModel.Configuration.ClientSection, System.ServiceModel, Version=3.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"/> <section name="comContracts" type="System.ServiceModel.Configuration.ComContractsSection, System.ServiceModel, Version=3.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"/> <section name="commonBehaviors" type="System.ServiceModel.Configuration.CommonBehaviorsSection, System.ServiceModel, Version=3.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" allowDefinition="MachineOnly" allowExeDefinition="MachineOnly"/> <section name="diagnostics" type="System.ServiceModel.Configuration.DiagnosticSection, System.ServiceModel, Version=3.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"/> <section name="extensions" type="System.ServiceModel.Configuration.ExtensionsSection, System.ServiceModel, Version=3.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"/> <section name="machineSettings" type="System.ServiceModel.Configuration.MachineSettingsSection, SMDiagnostics, Version=3.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" allowDefinition="MachineOnly" allowExeDefinition="MachineOnly"/> <section name="serviceHostingEnvironment" type="System.ServiceModel.Configuration.ServiceHostingEnvironmentSection, System.ServiceModel, Version=3.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"/> <section name="services" type="System.ServiceModel.Configuration.ServicesSection, System.ServiceModel, Version=3.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"/> </sectionGroup> <sectionGroup name="system.serviceModel.activation" type="System.ServiceModel.Activation.Configuration.ServiceModelActivationSectionGroup, System.ServiceModel, Version=3.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"> <section name="diagnostics" type="System.ServiceModel.Activation.Configuration.DiagnosticSection, System.ServiceModel, Version=3.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"/> <section name="net.pipe" type="System.ServiceModel.Activation.Configuration.NetPipeSection, System.ServiceModel, Version=3.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"/> <section name="net.tcp" type="System.ServiceModel.Activation.Configuration.NetTcpSection, System.ServiceModel, Version=3.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"/> </sectionGroup> <sectionGroup name="system.runtime.serialization" type="System.Runtime.Serialization.Configuration.SerializationSectionGroup, System.Runtime.Serialization, Version=3.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"> <section name="dataContractSerializer" type="System.Runtime.Serialization.Configuration.DataContractSerializerSection, System.Runtime.Serialization, Version=3.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"/> </sectionGroup> from site's web.config <sectionGroup name="system.web.extensions" type="System.Web.Configuration.SystemWebExtensionsSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"> <sectionGroup name="scripting" type="System.Web.Configuration.ScriptingSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"> <section name="scriptResourceHandler" type="System.Web.Configuration.ScriptingScriptResourceHandlerSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication" /> <sectionGroup name="webServices" type="System.Web.Configuration.ScriptingWebServicesSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"> <section name="jsonSerialization" type="System.Web.Configuration.ScriptingJsonSerializationSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="Everywhere" /> <section name="profileService" type="System.Web.Configuration.ScriptingProfileServiceSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication" /> <section name="authenticationService" type="System.Web.Configuration.ScriptingAuthenticationServiceSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication" /> <section name="roleService" type="System.Web.Configuration.ScriptingRoleServiceSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication" /> </sectionGroup> </sectionGroup> </sectionGroup> . . . <system.serviceModel> <bindings> <wsHttpBinding> <binding name="WSHttpBinding_IService" closeTimeout="00:03:00" openTimeout="00:03:00" receiveTimeout="00:10:00" sendTimeout="00:03:00" bypassProxyOnLocal="false" transactionFlow="false" hostNameComparisonMode="StrongWildcard" maxBufferPoolSize="524288" maxReceivedMessageSize="131072" messageEncoding="Text" textEncoding="utf-8" useDefaultWebProxy="true" allowCookies="false"> <readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384" maxBytesPerRead="4096" maxNameTableCharCount="16384" /> <reliableSession ordered="true" inactivityTimeout="00:10:00" enabled="false" /> <security mode="Message"> <transport clientCredentialType="Windows" proxyCredentialType="None" realm="" /> <message clientCredentialType="Windows" negotiateServiceCredential="true" algorithmSuite="Default" establishSecurityContext="true" /> </security> </binding> </wsHttpBinding> </bindings> <client> <endpoint address="some address" binding="wsHttpBinding" bindingConfiguration="WSHttpBinding_IService" contract="some contact" name="WSHttpBinding_IService" /> </client> Pertinant Exception Section: Exception information: Exception type: TypeLoadException Exception message: Could not load type 'System.Web.UI.ScriptReferenceBase' from assembly 'System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'.

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• How to fix an endpoint/configuration error using WCF in VB.NET

  - by Eric

  I'm working with a small web page that is meant to assist the users of my application. This web page takes a file and sends it to a central server, which then does something with the data and returns a result. I created this application some time ago and am coming back to it recently. I am getting some kind of configuration error right now, although this application used to work. When it stopped working, whenever I ran the page and sent the data to the central server, I would get this error: "Could not find default endpoint element that references contract 'CentralService.ICwCentralService' in the ServiceModel client configuration section. This might be because no configuration file was found for your application, or because no endpoint element matching this contract could be found in the client element." Looking at some other issues on the net, I thought I might have had the answer. The service reference to the endpoint was contained in a separate project from the code that called it, but the configuration file in that project had no information about the endpoint. So, I added these entries to the web.config file in the main project: <system.serviceModel> <bindings> <wsHttpBinding> <binding name="wsHttpEndpoint" closeTimeout="00:01:00" openTimeout="00:0:10" receiveTimeout="01:10:00" sendTimeout="01:01:00" bypassProxyOnLocal="false" transactionFlow="false" hostNameComparisonMode="StrongWildcard" maxBufferPoolSize="999999999" maxReceivedMessageSize="999999999" messageEncoding="Text" textEncoding="utf-8" useDefaultWebProxy="true" allowCookies="false"> <readerQuotas maxDepth="999999999" maxStringContentLength="999999999" maxArrayLength="999999999" maxBytesPerRead="999999999" maxNameTableCharCount="999999999" /> <reliableSession ordered="true" inactivityTimeout="01:10:00" enabled="false" /> <security mode="Message"> <transport clientCredentialType="Windows" proxyCredentialType="None" realm="" /> <message clientCredentialType="Windows" negotiateServiceCredential="true" algorithmSuite="Default" establishSecurityContext="true" /> </security> </binding> </wsHttpBinding> </bindings> <client> <endpoint address="http://localhost:22269/CwCentralService.svc" binding="wsHttpBinding" bindingConfiguration="wsHttpEndpoint" contract="CentralService.ICwCentralService" name="wsHttpEndpoint"> <identity> <servicePrincipalName /> </identity> </endpoint> </client> </system.serviceModel> Now, if I run it, I'm still getting an error: "The remote server returned an unexpected response: (400) Bad Request." The strange thing is, though, I took those entries from another project that contacts the central server. That application has no problems contacting the central server using these settings. It's not a web page application, but I don't see how that would require these settings to change. I cannot tell what started causing these errors or when. I assume its something that changed outside of the application (e.g. the libraries referenced) that requires an update to the configuration in the application. I am currently using .NET 3.0 for all of my applications. Any help would be appreciated.

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• "interface not found" in WCF Moniker without registration for excel

  - by tbischel

  I'm trying to connect excel to a WCF service, but I can't seem to get even a trivial case to work... I get an Invalid Syntax error when I try and create the proxy in excel. I've attached the visual studio debugger to excel, and get that the real error is "interface not found". I know the service works because the test client created by visual studio is ok... so the problem is in the VBA moniker string. I'm hoping to find one of two things: 1) a correction to my moniker string that will make this work, or 2) an existing sample project to download that has the source for both the host and client that does work. Here is the code for my VBA client: Dim addr As String addr = "service:mexAddress=net.tcp://localhost:7891/Test/WcfService1/Service1/mex, " addr = addr + "address=net.tcp://localhost:7891/Test/WcfService1/Service1/, " addr = addr + "contract=IService1, contractNamespace=http://tempuri.org, " addr = addr + "binding=NetTcpBinding_IService1, bindingNamespace=""http://tempuri.org""" MsgBox (addr) Dim service1 As Object Set service1 = GetObject(addr) MsgBox service1.Test(12) I have the following service: [ServiceContract] public interface IService1 { [OperationContract] string GetData(int value); } public class Service1 : IService1 { public string GetData(int value) { return string.Format("You entered: {0}", value); } } It has the following config file: <?xml version="1.0" encoding="utf-8" ?> <configuration> <system.web> <compilation debug="true" /> </system.web> <!-- When deploying the service library project, the content of the config file must be added to the host's app.config file. System.Configuration does not support config files for libraries. --> <system.serviceModel> <services> <service behaviorConfiguration="WcfService1.Service1Behavior" name="WcfService1.Service1"> <endpoint address="" binding="netTcpBinding" bindingConfiguration="" contract="WcfService1.IService1"> <identity> <dns value="localhost" /> </identity> </endpoint> <endpoint address="mex" binding="mexTcpBinding" bindingConfiguration="" contract="IMetadataExchange" /> <host> <baseAddresses> <add baseAddress="net.tcp://localhost:7891/Test/WcfService1/Service1/" /> </baseAddresses> </host> </service> </services> <behaviors> <serviceBehaviors> <behavior name="WcfService1.Service1Behavior"> <serviceMetadata httpGetEnabled="false" /> <serviceDebug includeExceptionDetailInFaults="false" /> </behavior> </serviceBehaviors> </behaviors> </system.serviceModel> </configuration>

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• WCF Reliable Session Timeout

  - by RemotecUk

  Hi, when do reliable sessions time out? My session class is defined as follows: [ServiceBehavior(InstanceContextMode = InstanceContextMode.PerSession, ConcurrencyMode = ConcurrencyMode.Multiple)] and in my app.config... <bindings> <netTcpBinding> <binding name="FTS_netTcpBinding"> <reliableSession enabled="true" inactivityTimeout="00:00:30"/> </binding> </netTcpBinding> </bindings> I have put a timer in the constructor of my session class that simply outputs a count (1..2..3...) to the console for every second the session is active. I have tested it so far by faulting my channel. I would have imagined that the session class would have died after ~30 seconds (as specified in my inactivityTimeout parameter) and hence the timer would have died. However it was still going after a minute. Each session on my app will have significant resources so I need to make sure that they are cleaned up when something goes wrong. Thanks.

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• WCF deadlock when using callback channel

  - by mafutrct

  This is probably a simple mistake, but I could not figure out what was wrong. I basically got a method like this: [ServiceBehavior ( ConcurrencyMode = ConcurrencyMode.Reentrant, InstanceContextMode = InstanceContextMode.PerSession, IncludeExceptionDetailInFaults = true) ] public class Impl : SomeContract { public string Foo() { _CallbackChannel.Blah(); return ""; } } Its interface is decorated: [ServiceContract ( Namespace = "http://MyServiceInterface", SessionMode = SessionMode.Required, CallbackContract = typeof (WcfCallbackContract)) ] public interface SomeContract { [OperationContract] string Foo (); } The service is hosted like this: ServiceHost host = new ServiceHost (typeof (Impl)); var binding = new NetTcpBinding (); var address = new Uri ("net.tcp://localhost:8000/"); host.AddServiceEndpoint ( typeof (SomeContract), binding, address); host.Open (); The client implements the callback interface and calls Foo. Foo runs, calls the callback method and returns. However, the client is still struck in the call to Foo and never returns. The client callback method is never run. I guess I made a design mistake somewhere. If needed, I can post more code. Any help is appreciated.

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• wcf configuration for this code

  - by user208081

  I have the following code and would like to convert a lot of code into configuration settings for WCF. As you can see, the code is using wshttpbinding. I appreciate any help on this. try { // Provides a unique network address that a client uses to communicate with a service endpoint. EndpointAddress endpointAddress = new EndpointAddress(new Uri(FAXServiceSettings.Default.FAXReceiveServiceURL)); // Specify the protocols, transports, and message encoders used for communication between the client and the service. // WSHttpBinding represents an interoperable binding that supports distributed transactions and secure, reliable sessions. // Spefically, SOAP message security is enabled for secure transmission of the message content. WSHttpBinding clientBinding = new WSHttpBinding(SecurityMode.Message); clientBinding.OpenTimeout = TimeSpan.FromSeconds(FAXServiceSettings.Default.FAXReceiveServiceOpenTimeoutInSeconds); clientBinding.SendTimeout = TimeSpan.FromSeconds(FAXServiceSettings.Default.FAXReceiveServiceOpenTimeoutInSeconds); // Use the ChannelFactory to enable the creation of channels to the binding and endpoint. using (ChannelFactory<IReceiveFAX> channelFactory = new ChannelFactory<IReceiveFAX>(clientBinding, endpointAddress)) { // Creates a channel of a specified type to a specified endpoint address. IReceiveFAX channel = channelFactory.CreateChannel(); if (channel != null) { try { // Submit the FaxSchedule instance for routing. channel.SubmitFAXForRouting(CreateNewFaxScheduleContainerInstance()); // Explicitly close the channel using the IClientChannel interface. CloseChannel((channel as IClientChannel)); } finally { // Explicitly dispose of the channel using IDisposable interface. DisposeOfChannel((channel as IDisposable)); channel = null; } } // This method causes a CommunicationObject to gracefully transition from any state, other than the Closed state, into the Closed state. The Close method allows any // unfinished work to be completed before returning. For example, finish sending any buffered messages. channelFactory.Close(); } } catch { throw; } Pratik

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• Problem with WCF Streaming

  - by H4mm3rHead

  Hi, I was looking at this thread: http://stackoverflow.com/questions/1935040/how-to-handle-large-file-uploads-via-wcf I need to have a web service hosted at my provider where i need to upload and download files to. We are talking videos from 1Mb to 100Mb hence the streaming approach. I cant get it to work, i declared an Interface: [ServiceContract] public interface IFileTransferService { [OperationContract] void UploadFile(Stream stream); } and all is fine, i implement it like this: public string FileName = "test"; public void UploadFile(Stream stream) { try { FileStream outStream = File.Open(FileName, FileMode.Create, FileAccess.Write); const int bufferLength = 4096; byte[] buffer = new byte[bufferLength]; int count = 0; while((count = stream.Read(buffer, 0, bufferLength)) > 0) { //progress outStream.Write(buffer, 0, count); } outStream.Close(); stream.Close(); //saved } catch(Exception ex) { throw new Exception("error: "+ex.Message); } } Still no problem, its published to my webserver out on the interweb. So far so good. Now i make a reference to it and will pass it a FileStream, but the argument is now a byte[] - why is that and how do i get it the proper way for streaming? Edit My binding look like this: <bindings> <basicHttpBinding> <binding name="StreamingFileTransferServicesBinding" transferMode="StreamedRequest" maxBufferSize="65536" maxReceivedMessageSize="204003200" /> </basicHttpBinding> </bindings> I can consume it without problems, and get no errors - other than my input parameter has changed from a stream to a byte[]

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• WCF Callback Contract InvalidOperationException: Collection has been modified

  - by mrlane

  We are using a WCF service with a Callback contract. Communication is Asynchronous. The service contract is defined as: [ServiceContract(Namespace = "Silverlight", CallbackContract = typeof(ISessionClient),SessionMode = SessionMode.Allowed)] public interface ISessionService With a method: [OperationContract(IsOneWay = true)] void Send(Message message); The callback contract is defined as [ServiceContract] public interface ISessionClient With methods: [OperationContract(IsOneWay = true, AsyncPattern = true)] IAsyncResult BeginSend(Message message, AsyncCallback callback, object state); void EndSend(IAsyncResult result); The implementation of BeginSend and EndSend in the callback channel are as follows: public void Send(ActionMessage actionMessage) { Message message = Message.CreateMessage(_messageVersion, CommsSettings.SOAPActionReceive, actionMessage, _messageSerializer); lock (LO_backChannel) { try { _backChannel.BeginSend(message, OnSendComplete, null); } catch (Exception ex) { _hasFaulted = true; } } } private void OnSendComplete(IAsyncResult asyncResult) { lock (LO_backChannel) { try { _backChannel.EndSend(asyncResult); } catch (Exception ex) { _hasFaulted = true; } } } We are getting an InvalidOperationException: "Collection has been modified" on _backChannel.EndSend(asyncResult) seemingly randomly, and we are really out of ideas about what is causing this. I understand what the exception means, and that concurrency issues are a common cause of such exceptions (hence the locks), but it really doesn't make any sense to me in this situation. The clients of our service are Silverlight 3.0 clients using PollingDuplexHttpBinding which is the only binding available for Silverlight. We have been running fine for ages, but recently have been doing a lot of data binding, and this is when the issues started. Any help with this is appreciated as I am personally stumped at this time.

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• Calling WCF service with parameters from VBScript

  - by Mick Mason

  http://stackoverflow.com/questions/944975 I'm trying to use the code from the above stack article, but my WCF service method requires parameters: SaveCheckData int,int,string,string I've tried frigging with the code to incorporate this, but to be honest, I may as well be trying to perform heart surgery. Can anyone shed any light on how i'd need to modify the code to call a SOAPAction that requires parameters? Thanks Mick

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• WCF Service behind F5 Bigip endpoint issue

  - by John

  we have WCF services hosted on IIS in 4 web servers, these web servers are behind the F5 Bigip load balancing system, SSL accelarator. When the client calls the service it'll be calling https myserver.com/myservices.svc but actually .svc will be in different servers like http web1.mysever.com/myservices.svc, http web2.mysever.com/myservices.svc, etc how do we handle this issue?

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• Best way to mock WCF Client proxy

  - by chugh97

  Are there any ways to mock a WCF client proxy using Rhino mocks framework so I have access to the Channel property? I am trying to unit test Proxy.Close() method but as the proxy is constructed using the abstract base class ClientBast which has the ICommunication interface, my unit test is failing as the internal infrastructure of the class is absent in the mock object. Any good ways with code samples would be greatly appreciated.

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