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• How can I generate a client proxy for a WCF service with an HTTPS endpoint?

  - by ng5000

  Might be the same issue as this previuos question: WCF Proxy but not sure... I have an HTTPS service connfigured to use transport security and, I hope, Windows credentials. The service is only accessed internally (i.e. within the intranet). The configuration is as follows: <configuration> <system.serviceModel> <services> <service name="WCFTest.CalculatorService" behaviorConfiguration="WCFTest.CalculatorBehavior"> <host> <baseAddresses> <add baseAddress = "https://localhost:8000/WCFTest/CalculatorService/" /> </baseAddresses> </host> <endpoint address ="basicHttpEP" binding="basicHttpBinding" contract="WCFTest.ICalculatorService" bindingConfiguration="basicHttpBindingConfig"/> <endpoint address="mex" binding="mexHttpsBinding" contract="IMetadataExchange"/> </service> </services> <bindings> <basicHttpBinding> <binding name="basicHttpBindingConfig"> <security mode="Transport"> <transport clientCredentialType = "Windows"/> </security> </binding> </basicHttpBinding> </bindings> <behaviors> <serviceBehaviors> <behavior name="WCFTest.CalculatorBehavior"> <serviceAuthorization impersonateCallerForAllOperations="false" principalPermissionMode="UseWindowsGroups" /> <serviceCredentials > <windowsAuthentication allowAnonymousLogons="false" includeWindowsGroups="true" /> </serviceCredentials> <serviceMetadata httpsGetEnabled="True"/> <serviceDebug includeExceptionDetailInFaults="False" /> </behavior> </serviceBehaviors> </behaviors> </system.serviceModel> </configuration> When I run the service I can't see the service in IE. I get a "this page can not be displayed" error. If I try and create a client in VS2008 via the "add service reference" wizard I get this error: There was an error downloading 'https://localhost:8000/WCFTest/CalculatorService/'. There was an error downloading 'https://localhost:8000/WCFTest/CalculatorService/'. The underlying connection was closed: An unexpected error occurred on a send. Authentication failed because the remote party has closed the transport stream. Metadata contains a reference that cannot be resolved: 'https://localhost:8000/WCFTest/CalculatorService/'. An error occurred while making the HTTP request to https://localhost:8000/WCFTest/CalculatorService/. This could be due to the fact that the server certificate is not configured properly with HTTP.SYS in the HTTPS case. This could also be caused by a mismatch of the security binding between the client and the server. The underlying connection was closed: An unexpected error occurred on a send. Authentication failed because the remote party has closed the transport stream. If the service is defined in the current solution, try building the solution and adding the service reference again. I think I'm missing some fundamental basics here. Do I need to set up some certificates? Or should it all just work as it seems to do when I use NetTcpBinding? Thanks

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• What is the cause of exception in wcf peer-to-peer service with callbacks ?

  - by miensol

  I've been playing around with WCF peer to peer, one way operation contract and callbacks. I have a following service: [ServiceContract(CallbackContract = typeof(ICodeFoundCallback))] public interface ICodeSearch { [OperationContract(IsOneWay = true)] void Search(string searchQuery); } public interface ICodeFoundCallback { [OperationContract(IsOneWay = true)] void Found(string found); } public class CodeSearchService : ServiceWithCallback<ICodeFoundCallback>, ICodeSearch { public void Search(string searchQuery) { Console.WriteLine("Searching for :" + searchQuery); Callback(t=> t.Found(searchQuery)); } } public class ServiceWithCallback<T> { protected void Callback(Action<T> call) { var callbackChanel = OperationContext.Current.GetCallbackChannel<T>(); call(callbackChanel); } } with such config on server <system.serviceModel> <services> <service name="CodeSearch.Service.CodeSearchService" behaviorConfiguration="CodeSearchServiceBehavior"> <host> <baseAddresses> <add baseAddress="net.p2p://CodeSearchService"/> </baseAddresses> </host> <endpoint name="CodeSearchServiceEndpoint" address="" binding="netPeerTcpBinding" bindingConfiguration="BindingUnsecure" contract="CodeSearch.Service.ICodeSearch" /> </service> </services> <behaviors> <serviceBehaviors> <behavior name="CodeSearchServiceBehavior"> <serviceMetadata /> </behavior> </serviceBehaviors> </behaviors> <bindings> <netPeerTcpBinding> <binding name="BindingUnsecure"> <security mode="None"/> <resolver mode="Pnrp"/> </binding> </netPeerTcpBinding> <customBinding> <binding name="CodeSearchServiceEndpoint"> <binaryMessageEncoding maxReadPoolSize="64" maxWritePoolSize="16" maxSessionSize="2048"> <readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384" maxBytesPerRead="4096" maxNameTableCharCount="16384" /> </binaryMessageEncoding> <peerTransport maxBufferPoolSize="524288" maxReceivedMessageSize="65536" port="0"> <security mode="None" /> </peerTransport> </binding> </customBinding> </bindings> <system.serviceModel> And simple client generated by Visual studio tooling. When I run two or more servers, and client invokes Search method: search method is called on each server first server calls client callback properly second server throws ArgumentException "A property with the name 'TransactionFlowProperty' already exists" when invoking client callback (Found method) I've no idea what is going on since as far as I know transaction flow is by default set to none. Could anyone help me solve this issue ?

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• What is the actual MSMQ address used by the respective WCF binding?

  - by mark

  Dear ladies and sirs. This question is related to this one. Given that WCF binding uses net.msmq:// URL, for instance net.msmq://server/private/nc_queue, how can one know what is the actual MSMQ address to which this URL is translated? Is there some kind of a trace that can be activated? Or an external tool that would help one capture the address? Thanks. EDIT1 OK, I owe a clarification. One can talk directly to MSMQ through the respective .NET API. In the case of MSMQ over its native port 1801, I would use this MSMQ address: FormatName:Direct=OS:server\private$\nc_queue When MSMQ is configured over HTTP, the address changes to something like this: FormatName:Direct=http://server/msmq/nc_queue But the WCF binding uses a standard URL to describe the address, like: net.msmq://server/private/nc_queue So, how can I know what is the actual MSMQ address (the one with the FormatName) to which the net.msmq:// is translated?

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• Non-Dom Element Event Binding with jQuery

  - by Rick Strahl

  Yesterday I had a short discussion with Dave Reed on Twitter regarding setting up fake ‘events’ on objects that are hookable. jQuery makes it real easy to bind events on DOM elements and with a little bit of extra work (that I didn’t know about) you can also set up binding to non-DOM element ‘event’ bindings. Assume for a second that you have a simple JavaScript object like this: var item = { sku: "wwhelp" , foo: function() { alert('orginal foo function'); } }; and you want to be notified when the foo function is called. You can use jQuery to bind the handler like this: $(item).bind("foo", function () { alert('foo Hook called'); } ); Binding alone won’t actually cause the handler to be triggered so when you call: item.foo(); you only get the ‘original’ message. In order to fire both the original handler and the bound event hook you have to use the .trigger() function: $(item).trigger("foo"); Now if you do the following complete sequence: var item = { sku: "wwhelp" , foo: function() { alert('orginal foo function'); } }; $(item).bind("foo", function () { alert('foo hook called'); } ); $(item).trigger("foo"); You’ll see the ‘hook’ message first followed by the ‘original’ message fired in succession. In other words, using this mechanism you can hook standard object functions and chain events to them in a way similar to the way you can do with DOM elements. The main difference is that the ‘event’ has to be explicitly triggered in order for this to happen rather than just calling the method directly. .trigger() relies on some internal logic that checks for event bindings on the object (attached via an expando property) which .trigger() searches for in its bound event list. Once the ‘event’ is found it’s called prior to execution of the original function. This is pretty useful as it allows you to create standard JavaScript objects that can act as event handlers and are effectively hookable without having to explicitly override event definitions with JavaScript function handlers. You get all the benefits of jQuery’s event methods including the ability to hook up multiple events to the same handler function and the ability to uniquely identify each specific event instance with post fix string names (ie. .bind("MyEvent.MyName") and .unbind("MyEvent.MyName") to bind MyEvent). Watch out for an .unbind() Bug Note that there appears to be a bug with .unbind() in jQuery that doesn’t reliably unbind an event and results in a elem.removeEventListener is not a function error. The following code demonstrates: var item = { sku: "wwhelp", foo: function () { alert('orginal foo function'); } }; $(item).bind("foo.first", function () { alert('foo hook called'); }); $(item).bind("foo.second", function () { alert('foo hook2 called'); }); $(item).trigger("foo"); setTimeout(function () { $(item).unbind("foo"); // $(item).unbind("foo.first"); // $(item).unbind("foo.second"); $(item).trigger("foo"); }, 3000); The setTimeout call delays the unbinding and is supposed to remove the event binding on the foo function. It fails both with the foo only value (both if assigned only as “foo” or “foo.first/second” as well as when removing both of the postfixed event handlers explicitly. Oddly the following that removes only one of the two handlers works: setTimeout(function () { //$(item).unbind("foo"); $(item).unbind("foo.first"); // $(item).unbind("foo.second"); $(item).trigger("foo"); }, 3000); this actually works which is weird as the code in unbind tries to unbind using a DOM method that doesn’t exist. <shrug> A partial workaround for unbinding all ‘foo’ events is the following: setTimeout(function () { $.event.special.foo = { teardown: function () { alert('teardown'); return true; } }; $(item).unbind("foo"); $(item).trigger("foo"); }, 3000); which is a bit cryptic to say the least but it seems to work more reliably. I can’t take credit for any of this – thanks to Dave Reed and Damien Edwards who pointed out some of these behaviors. I didn’t find any good descriptions of the process so thought it’d be good to write it down here. Hope some of you find this helpful.© Rick Strahl, West Wind Technologies, 2005-2010Posted in jQuery  

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• Credentials Not Passed From SharePoint WebPart to WCF Service

  - by Jacob L. Adams

  I have spent several hours trying to resolve this problem, so I wanted to share my findings in case someone else might have the same problem. I had a web part which was calling out to a WCF service on another server to get some data. The code I had was essentially using System.ServiceModel; using System.ServiceModel.Channels; ... var binding = new CustomBinding( new HttpTransportBindingElement { AuthenticationScheme = System.Net.AuthenticationSchemes.Negotiate } ); var endpoint = new EndpointAddress(new Uri("http://someotherserver/someotherservice.svc")); var someOtherService = new SomeOtherServiceClient(binding, endpoint); string result = someOtherService.SomeServiceMethod(); This code would run fine on my local instance of SharePoint 2010 (Windows 7 64-bit). However, when I would deploy it to the testing environment, I would get a yellow screen of death  with the following message: The HTTP request is unauthorized with client authentication scheme 'Negotiate'. The authentication header received from the server was 'Negotiate,NTLM'. I then went through the usual checklist of Windows Authentication problems: Check WCF bindings to make sure authentication is set correctly Check IIS to make sure Windows Authentication is enabled and anonymous authentication was disabled. Check to make sure the SharePoint server trusted the server hosting the WCF service Verify that the account that the IIS application pool is running under has access to the other server I then spend lot of time digging into really obscure IIS, machine.config, and trust settings (as well of lots of time on Google and StackOverflow). Eventually I stumbled upon a blog post by Todd Bleeker describing how to run code under the application pool identity. Wait, what? The code is not already running under application pool identity? Another quick Google search led me to an MSDN page that imply that SharePoint indeed does not run under the app pool credentials by default. Instead SPSecurity.RunWithElevatedPrivileges is needed to run code under the app pool identity. Therefore, changing my code to the following worked seamlessly using System.ServiceModel; using System.ServiceModel.Channels; using Microsoft.SharePoint; ... var binding = new CustomBinding( new HttpTransportBindingElement { AuthenticationScheme = System.Net.AuthenticationSchemes.Negotiate } ); var endpoint = new EndpointAddress(new Uri("http://someotherserver/someotherservice.svc")); var someOtherService = new SomeOtherServiceClient(binding, endpoint); string result; SPSecurity.RunWithElevatedPrivileges(()=> { result = someOtherService.SomeServiceMethod(); });

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• Data Binding to Attached Properties

  - by Chris Gardner

  Originally posted on: http://geekswithblogs.net/freestylecoding/archive/2013/06/14/data-binding-to-attached-properties.aspx When I was working on my C#/XAML game framework, I discovered I wanted to try to data bind my sprites to background objects. That way, I could update my objects and the draw functionality would take care of the work for me. After a little experimenting and web searching, it appeared this concept was an impossible dream. Of course, when has that ever stopped me? In my typical way, I started to massively dive down the rabbit hole. I created a sprite on a canvas, and I bound it to a background object. <Canvas Name="GameField" Background="Black"> <Image Name="PlayerStrite" Source="Assets/Ship.png" Width="50" Height="50" Canvas.Left="{Binding X}" Canvas.Top="{Binding Y}"/> </Canvas> Now, we wire the UI item to the background item. public MainPage() { this.InitializeComponent(); this.Loaded += StartGame; }   void StartGame( object sender, RoutedEventArgs e ) { BindingPlayer _Player = new BindingPlayer(); _Player.X = Window.Current.Bounds.Height - PlayerSprite.Height; _Player.X = ( Window.Current.Bounds.Width - PlayerSprite.Width ) / 2.0; } Of course, now we need to actually have our background object. public class BindingPlayer : INotifyPropertyChanged { private double m_X; public double X { get { return m_X; } set { m_X = value; NotifyPropertyChanged(); } }   private double m_Y; public double Y { get { return m_Y; } set { m_Y = value; NotifyPropertyChanged(); } }   public event PropertyChangedEventHandler PropertyChanged; protected void NotifyPropertyChanged( [CallerMemberName] string p_PropertyName = null ) { if( PropertyChanged != null ) PropertyChanged( this, new PropertyChangedEventArgs( p_PropertyName ) ); } } I fired this baby up, and my sprite was correctly positioned on the screen. Maybe the sky wasn't falling after all. Wouldn't it be great if that was the case? I created some code to allow me to move the sprite, but nothing happened. This seems odd. So, I start debugging the application and stepping through code. Everything appears to be working. Time to dig a little deeper. After much profanity was spewed, I stumbled upon a breakthrough. The code only looked like it was working. What was really happening is that there was an exception being thrown in the background thread that I never saw. Apparently, the key call was the one to PropertyChanged. If PropertyChanged is not called on the UI thread, the UI thread ignores the call. Actually, it throws an exception and the background thread silently crashes. Of course, you'll never see this unless you're looking REALLY carefully. This seemed to be a simple problem. I just need to marshal this to the UI thread. Unfortunately, this object has no knowledge of this mythical UI Thread in which we speak. So, I had to pull the UI Thread out of thin air. Let's change our PropertyChanged call to look this. public event PropertyChangedEventHandler PropertyChanged; protected void NotifyPropertyChanged( [CallerMemberName] string p_PropertyName = null ) { if( PropertyChanged != null ) Windows.ApplicationModel.Core.CoreApplication.MainView.CoreWindow.Dispatcher.RunAsync( Windows.UI.Core.CoreDispatcherPriority.Normal, new Windows.UI.Core.DispatchedHandler( () => { PropertyChanged( this, new PropertyChangedEventArgs( p_PropertyName ) ); } ) ); } Now, we raised our notification on the UI thread. Everything is fine, people are happy, and the world moves on. You may have noticed that I didn't await my call to the dispatcher. This was intentional. If I am trying to update a slew of sprites, I don't want thread being hung while I wait my turn. Thus, I send the message and move on. It is worth nothing that this is NOT the most efficient way to do this for game programming. We'll get to that in another blog post. However, it is perfectly acceptable for a business app that is running a background task that would like to notify the UI thread of progress on a periodic basis. It is worth noting that this code was written for a Windows Store App. You can do the same thing with WP8 and WPF. The call to the marshaler changes, but it is the same idea.

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• Modelling a checkable treeview in the MVVM model

  - by Stephen Stranded

  Hi, I am trying to create a checkable treeview control to list hierarchical data but it does not seem to work. I used the MVVM model example used by in codeplex simplified Treeview using ViewModel but it shows nothing. Here is my code. Please help. I am a newbie to WPF and the MVVM model but i very much want to use it in an urgent application. </UserControl.Resources> <Grid> <StackPanel Height="166"> <TextBlock Text="Please Display this" /> <TreeView ItemsSource="{Binding Classifications}" Height="141"> <TreeView.ItemContainerStyle> <!-- This Style binds a TreeViewItem to a TreeViewItemViewModel. --> <Style TargetType="{x:Type TreeViewItem}"> <Setter Property="IsExpanded" Value="{Binding IsExpanded, Mode=TwoWay}" /> <Setter Property="IsSelected" Value="{Binding IsSelected, Mode=TwoWay}" /> <Setter Property="FontWeight" Value="Normal" /> <Style.Triggers> <Trigger Property="IsSelected" Value="True"> <Setter Property="FontWeight" Value="Bold" /> </Trigger> </Style.Triggers> </Style> </TreeView.ItemContainerStyle> <TreeView.Resources> <HierarchicalDataTemplate DataType="{x:Type local:PropertyTypeViewModel}" ItemsSource="{Binding Children}"> <StackPanel Orientation="Horizontal"> <CheckBox Focusable="false" IsChecked="{Binding isSelected}"></CheckBox> <TextBlock Text="{Binding Classification}" /> </StackPanel> </HierarchicalDataTemplate> <HierarchicalDataTemplate DataType="{x:Type local:PropertyViewModel}" ItemsSource="{Binding Children}" > <StackPanel Orientation="Horizontal"> <CheckBox Focusable="false" IsChecked="{Binding isSelected}"></CheckBox> <TextBlock Text="{Binding PropertyName}" /> </StackPanel> </HierarchicalDataTemplate> <DataTemplate DataType="{x:Type local:LeaseViewModel}"> <StackPanel Orientation="Horizontal"> <CheckBox Focusable="false" IsChecked="{Binding isSelected}"></CheckBox> <TextBlock Text="{Binding TenantName}" /> </StackPanel> </DataTemplate> </TreeView.Resources> </TreeView> </StackPanel> </Grid>

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• Elmah for non-HTTP protocol applications OR Elmah without HttpContext

  - by Josh

  We are working on a 3-tier application, and we've been allowed to use the latest and greatest (MVC2, IIS7.5, WCF, SQL2k8, etc). The application tier is exposed to the various web applications by WCF services. Since we control both the service and client side, we've decided to use net.tcp bindings for their performance advantage over HTTP. We would like to use ELMAH for the error logging, both on the web apps and services. Here's my question. There's lots of information about using ELMAH with WCF, but it is all for HTTP bindings. Does anyone know if/how you can use ELMAH with WCF services exposing non-HTTP endpoints? My guess is no, because ELMAH wants the HttpContext, which requires the AspNetCompatibilityEnabled flag to be true in the web.config. From MSDN: IIS 7.0 and WAS allows WCF services to communicate over protocols other than HTTP. However, WCF services running in applications that have enabled ASP.NET compatibility mode are not permitted to expose non-HTTP endpoints. Such a configuration generates an activation exception when the service receives its first message. If it is true that you cannot use ELMAH with WCF services having non-HTTP endpoints, then the follow-up question is: Can we use ELMAH in such a way that doesn't need HttpContext? Or more generally (so as not to commit the thin metal ruler error), is there ANY way to use ELMAH with WCF services having non-HTTP endpoints?

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• ServiceRoute + WebServiceHostFactory kills WSDL generation? How to create extensionless WCF service

  - by Ethan J. Brown

  I'm trying to use extenionless / .svc-less WCF services. Can anyone else confirm or deny the issue I'm experiencing? I use routing in code, and do this in Application_Start of global.asax.cs: RouteTable.Routes.Add(new ServiceRoute("Data", new WebServiceHostFactory(), typeof(DataDips))); I have tested in both IIS 6 and IIS 7.5 and I can use the service just fine (ie my extensionless handler is correctly configured for ASP.NET). However, metadata generation is totally screwed up. I can hit my /mex endpoint with the WCF Test Client (and I presume svcutil.exe) -- but the ?wsdl generation you typically get with .svc is toast. I can't hit it with a browser (get 400 bad request), I can't hit it with wsdl.exe, etc. Metadata generation is configured correctly in web.config. This is a problem of course, because the service is exposed as basicHttpBinding so that an old style ASMX client can get to it. But of course, the client can't generate the proxy without a WSDL description. If I instead use serviceActivation routing in config like this, rather than registering a route in code: <serviceHostingEnvironment aspNetCompatibilityEnabled="true"> <serviceActivations> <add relativeAddress="Data.svc" service="DataDips" /> </serviceActivations> </serviceHostingEnvironment> Then voila... it works. But then I don't have a clean extensionless url. If I change relativeAddress from Data.svc to Data, then I get a configuration exception as this is not supported by config. (Must use an extension registered to WCF). I've also attempted to use this code in conjunction with the above config: RouteTable.Routes.MapPageRoute("","Data/{*data}","~/Data.svc/{*data}",false); My thinking is that I can just point the extensionless url at the configured .svc url. This doesn't work -- the /Data.svc continues to work, but /Data returns a 404. Anyone with any bright ideas?

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• Why can't I use WCF DataContract and ISerializable on the same class?

  - by Dave

  Hi all, I have a class that I need to be able to serialize to a SQLServer session variable and be available over a WCF Service. I have declared it as follows namespace MyNM { [Serializable] [DataContract(Name = "Foo", Namespace = "http://www.mydomain.co.uk")] public class Foo : IEntity, ISafeCopy<Foo> { [DataMember(Order = 0)] public virtual Guid Id { get; set; } [DataMember(Order = 1)] public virtual string a { get; set; } DataMember(Order = 2)] public virtual Bar c { get; set; } /* ISafeCopy implementation */ } [Serializable] [DataContract(Name = "Bar ", Namespace = "http://www.mydomain.co.uk")] public class Bar : IEntity, ISafeCopy<Bar> { #region Implementation of IEntity DataMember(Order = 0)] public virtual Guid Id { get; set; } [DataMember(Order = 1)] public virtual Baz y { get; set; } #endregion /* ISafeCopy implementation*/ } [Serializable] [DataContract] public enum Baz { [EnumMember(Value = "one")] one, [EnumMember(Value = "two")] two, [EnumMember(Value = "three")] three } But when I try and call this service, I get the following error in the trace log. "System.Runtime.Serialization.InvalidDataContractException: Type 'BarProxybcb100e8617f40ceaa832fe4bb94533c' cannot be ISerializable and have DataContractAttribute attribute." If I take out the Serializable attribute, the WCF service works, but when the object can't be serialized to session. If I remove the DataContract attribute from class Bar, the WCF service fails saying Type 'BarProxy3bb05a31167f4ba492909ec941a54533' with data contract name 'BarProxy3bb05a31167f4ba492909ec941a54533:http://schemas.datacontract.org/2004/07/' is not expected. Add any types not known statically to the list of known types - for example, by using the KnownTypeAttribute attribute or by adding them to the list of known types passed to DataContractSerializer I've tried adding a KnownType attribute to the foo class [KnownType(typeof(Bar))] But I still get the same error. Can anyone help me out with this? Many thanks Dave

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• 4.0/WCF: Best approach for bi-idirectional message bus?

  - by TomTom

  Just a technology update, now that .NET 4.0 is out. I write an application that communicates to the server through what is basically a message bus (instead of method calls). This is based on the internal architecture of the application (which is multi threaded, passing the messages around). There are a limited number of messages to go from the client to the server, quite a lot more from the server to the client. Most of those can be handled via a separate specialized mechanism, but at the end we talk of possibly 10-100 small messages per second going from the server to the client. The client is supposed to operate under "internet conditions". THis means possibly home end users behind standard NAT devices (i.e. typical DSL routers) - a firewalled secure and thus "open" network can not be assumed. I want to have as little latency and as little overhad for the communication as possible. What is the technologally best way to handle the message bus callback? I Have no problem regularly calling to the server for message delivery if something needs to be sent... ...but what are my options to handle the messagtes from the server to the client? WsDualHttp does work how? Especially under a NAT scenario? Just as a note: polling is most likely out - the main problem here is that I would have a significant overhead OR a significant delay, both aren ot really wanted. Technically I would love some sort of streaming appraoch, where the server can write messags to a stream while he generates them and they get sent to the client as they come. Not esure this is doable with WCF, though (if not, I may acutally decide to handle the whole message part outside of WCF and just do control / login / setup / destruction via WCF).

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• WCF and ASP.NET - Server.Execute throwing object reference not set to an instance of an object

  - by user208662

  Hello, I have an ASP.NET page that calls to a WCF service. This WCF service uses a BackgroundWorker to asynchronously create an ASP.NET page on my server. Oddly, when I execute the WCF Service [OperationContract] [WebInvoke(Method = "POST", BodyStyle = WebMessageBodyStyle.WrappedRequest, RequestFormat = WebMessageFormat.Json, ResponseFormat = WebMessageFormat.Json)] public void PostRequest(string comments) { // Do stuff // If everything went o.k. asynchronously render a page on the server. I do not want to // block the caller while this is occurring. BackgroundWorker myWorker = new BackgroundWorker(); myWorker.DoWork += new DoWorkEventHandler(myWorker_DoWork); myWorker.RunWorkerAsync(HttpContext.Current); } private void myWorker_DoWork(object sender, DoWorkEventArgs e) { // Set the current context so we can render the page via Server.Execute HttpContext context = (HttpContext)(e.Argument); HttpContext.Current = context; // Retrieve the url to the page string applicationPath = context.Request.ApplicationPath; string sourceUrl = applicationPath + "/log.aspx"; string targetDirectory = currentContext.Server.MapPath("/logs/"); // Execute the other page and load its contents using (StringWriter stringWriter = new StringWriter()) { // Write the contents out to the target url // NOTE: THIS IS WHERE MY ERROR OCCURS currentContext.Server.Execute(sourceUrl, stringWriter); // Prepare to write out the result of the log targetPath = targetDirectory + "/" + DateTime.Now.ToShortDateString() + ".aspx"; using (StreamWriter streamWriter = new StreamWriter(targetPath, false)) { // Write out the content to the file sb.Append(stringWriter.ToString()); streamWriter.Write(sb.ToString()); } } } Oddly, when the currentContext.Server.Execute method is executed, it throws an "object reference not set to an instance of an object" error. The reason this is so strange is because I can look at the currentContext properties in the watch window. In addition, Server is not null. Because of this, I have no idea where this error is coming from. Can someone point me in the correct direction of what the cause of this could be? Thank you!

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• WCF code generation for large/complex schema (HR-XML/OAGIS) - is there an alternative?

  - by Sasha Borodin

  Hello, and thank you for reading. I am implementing a WCF Service based on a predefined specification (HR-XML 3.0). As such, I am starting with the schema, and working my way back to code. There are a number of large Schema documents (which import yet more Schema documents) related to my implementation, provided by this specification. I am able to generate code using xsd.exe, by supplying the "main" and "supporting" xsd files as arguments. But there are several issues, and I am wondering if this is the right approach. there are litterally hundreds of classes - the code file is half a meg in size duplicate classes (ex. Type, Type1 - which both represent the same type) there are classes declared as inheriting from a base class, but that base class is not generated/defined I understand that there are limitations to the types of Schema supported by svcutil.exe/xsd.exe when targeting the DataContractSerializer and even XmlSerializer. My question is two-fold: Are code generation "issues" fairly common when dealing with larger, modular xsd files? Has anyone had success with generating data contracts from OAGIS or HR-XML schema? Given the above issues, are there better approaches to this task, avoiding generating code and working with concrete objects? Does it make better sence to read and compose a SOAP message directly, while still taking advantage of the rest of the WCF framework? I understand that I am loosing the convenience of working with .NET objects, and the framekwork-provided (de)serialization; given these losses, would it still be advantageous to base my Service on WCF? Is there some "middle ground" between working with .NET types and pure XML? Thank you very much! -Sasha Borodin DFWHC.org

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• What is the easiest way to add compression to WCF in Silverlight?

  - by caryden

  I have a silverlight 2 beta 2 application that accesses a WCF web service. Because of this, it currently can only use basicHttp binding. The webservice will return fairly large amounts of XML data. This seems fairly wasteful from a bandwidth usage standpoint as the response, if zipped, would be smaller by a factor of 5 (I actually pasted the response into a txt file and zipped it.). The request does have the "Accept-Encoding: gzip, deflate" - Is there any way have the WCF service gzip (or otherwise compress) the response? I did find this link but it sure seems a bit complex for functionality that should be handled out-of-the-box IMHO. OK - at first I marked the solution using the System.IO.Compression as the answer as I could never "seem" to get the IIS7 dynamic compression to work. Well, as it turns out: Dynamic Compression on IIS7 was working al along. It is just that Nikhil's Web Developer Helper plugin for IE did not show it working. My guess is that since SL hands the web service call off to the browser, that the browser handles it "under the covers" and Nikhil's tool never sees the compressed response. I was able to confirm this by using Fiddler which monitors traffic external to the browser application. In fiddler, the response was, in fact, gzip compressed!! The other problem with the System.IO.Compression solution is that System.IO.Compression does not exist in the Silverlight CLR. So from my perspective, the EASIEST way to enable WCF compression in Silverlight is to enable Dynamic Compression in IIS7 and write no code at all.

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• How to customize the process employed by WCF when serializing contract method arguments?

  - by mark

  Dear ladies and sirs. I would like to formulate a contrived scenario, which nevertheless has firm actual basis. Imagine a collection type COuter, which is a wrapper around an instance of another collection type CInner. Both implement IList (never mind the T). Furthermore, a COuter instance is buried inside some object graph, the root of which (let us refer to it as R) is returned from a WCF service method. My question is how can I customize the WCF serialization process, so that when R is returned, the request to serialize the COuter instance will be routed through my code, which will extract CInner and pass it to the serializer instead. Thus the receiving end still gets R, only no COuter instance is found in the object graph. I hoped that http://stackoverflow.com/questions/2220516/how-does-wcf-serialize-the-method-call will contain the answer, unfortunately the article mentioned there (http://msdn.microsoft.com/en-us/magazine/cc163569.aspx) only barely mentions that advanced serialization scenarios are possible using IDataContractSurrogate interface, but no details are given. I am, on the other hand, would really like to see a working example. Thank you very much in advance.

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• How do I consume a self hosted WCF service with Compact Framework client?

  - by pitprog

  Hello - I've been trying to figure out how to consume a self hosted WCF service from a Windows CE device. I've not found any good resources that walk through this process online. I've found some good samples for self hosting, and that part seems to be working fine, but not sure how to go about consuming on the compact framework. In the past I was able to use NetCFSvcUtil.exe, but this doesn't seem to work with a self hosted service. NetCFSvcutil says: The underlying connection was closed: An unexpected error occurred on a receive. Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host. I've used Jason Henderson's sample http://www.codeproject.com/KB/WCF/WCFexample.aspx to get started with self hosting and that part works as expected. Can any one point me to a sample where a compact framework client is used to consume a self hosted WCF service? or give a brief explanation of how I create the plumbing on the compact framework side? For the host application I'm using a WinForm .Net 3.5 project and for the client a WinForm Compact Framework 3.5 project. Thanks!

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• WCF: get generic type object (e.g. MyObject<T>) from remote machine

  - by Aaron

  I have two applications that are communicating through WCF. On the server the following object exists: public class MyObject<T> { ... public Entry<T> GetValue() } Where Entry<T> is another object with T Data as a public property. T could be any number of types (string, double, etc) On the client I have ClientObject<T> that needs to get the value of Data from the server (same type). Since I'm using WCF, I have to define my ServiceContract as an interface, and I can't have ClientObject<T> call Entry<T> GetMyObjectValue (string Name) which calls GetValue on the correct MyObject<T> because my interface isn't aware of the type information. I've tried implementing separate GetValue functions (GetMyObjectValueDouble, GetMyObjectValueString) in the interface and then have ClientObject determine the correct one to call. However, Entry<T> val = (Entry<T>)GetMyObjectValueDouble(...); doesn't work because it's not sure about the type information. How can I go about getting a generic object over WCF with the correct type information? Let me know if there are other details I can provide. Thanks!

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• What is the best way to implement a callback scenario using WCF and ASP.NET MVC?

  - by Mark Struzinski

  I am new to WCF. I just finished reading Learning WCF and I think I've got a pretty good grasp of the fundamentals. I am adding functionality to a line of business app that runs on ASP.NET MVC entirely inside the corporate LAN. I am calling into a service that will also send me events as they occur (and not as responses to service calls). These events can occur at any point during the user's session. I have the service written, and it is able to pick up these events. What would be the best way to deliver these events to the user? My initial thought is to run the WCF service in duplex mode over net TCP and implement the events as callbacks. Using this scenario, the best way I can think up to deliver the events to the user is a dictionary object stored in the session. The dictionary would be populated by the callbacks and polled on a set frequency for delivery via AJAX calls. Has anyone dealt with this scenario? Is there a more efficient way to implement this?

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• MVVM Binding in Silverlight3 ItemsControl to get the parent controls DataContext

  - by BigTundra

  I have the following ItemsControl in Silverlight 3. <ItemsControl ItemsSource="{Binding ValueCollectionList}"> <ItemsControl.ItemTemplate> <DataTemplate> <Button x:Name="MyBtn" Height="40" Content="{Binding Name}" Tag="{Binding Value}" cmd:ButtonBaseExtensions.Command="{Binding ElementName=LayoutRoot, Path=ButtonCommand}" cmd:ButtonBaseExtensions.CommandParameter="{Binding ElementName=MyBtn, Path=Tag}"/> </DataTemplate> </ItemsControl.ItemTemplate> </ItemsControl> The Problem is that I have the ItemsControl bound to the Collection in my ViewModel, but I need the button to trigger a command on the ViewModel which is of course not Available in the DataContext of the button since it only contains the collection. I can make the command fire by setting my ViewModel as a Resource and then binding to it as a StaticResource, but I want to know why the element to element binding won't work in this scenario. I would prefer not to use the StaticResource binding because that requires the default constructor on the ViewModel and so I can't inject my data easily.

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• Silverlight 3 data-binding child property doesn't update

  - by sonofpirate

  I have a Silverlight control that has my root ViewModel object as it's data source. The ViewModel exposes a list of Cards as well as a SelectedCard property which is bound to a drop-down list at the top of the view. I then have a form of sorts at the bottom that displays the properties of the SelectedCard. My XAML appears as (reduced for simplicity): <StackPanel Orientation="Vertical"> <ComboBox DisplayMemberPath="Name" ItemsSource="{Binding Path=Cards}" SelectedItem="{Binding Path=SelectedCard, Mode=TwoWay}" /> <TextBlock Text="{Binding Path=SelectedCard.Name}" /> <ListBox DisplayMemberPath="Name" ItemsSource="{Binding Path=SelectedCard.PendingTransactions}" /> </StackPanel> I would expect the TextBlock and ListBox to update whenever I select a new item in the ComboBox, but this is not the case. I'm sure it has to do with the fact that the TextBlock and ListBox are actually bound to properties of the SelectedCard so it is listening for property change notifications for the properties on that object. But, I would have thought that data-binding would be smart enough to recognize that the parent object in the binding expression had changed and update the entire binding. It bears noting that the PendingTransactions property (bound to the ListBox) is lazy-loaded. So, the first time I select an item in the ComboBox, I do make the async call and load the list and the UI updates to display the information corresponding to the selected item. However, when I reselect an item, the UI doesn't change! For example, if my original list contains three cards, I select the first card by default. Data-binding does attempt to access the PendingTransactions property on that Card object and updates the ListBox correctly. If I select the second card in the list, the same thing happens and I get the list of PendingTransactions for that card displayed. But, if I select the first card again, nothing changes in my UI! Setting a breakpoint, I am able to confirm that the SelectedCard property is being updated correctly. How can I make this work???

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• WPF Toolkit Charting and IndependentValueBinding, IndependentValuePath

  - by Joel Barsotti

  So I'm having a problem with the charting engine from the WPF toolkit. We haven't moved our data to a proper object model, so the ItemSource is backed with a DataView. First attempt <chartingToolkit:ScatterSeries x:Name="TargetSeries" DataPointStyle="{StaticResource TargetStyle}" ItemsSource="{Binding Path=TargetSeriesData}" IndependentValueBinding="{Binding Path=TargetSeries_X}" DependentValueBinding="{Binding Path=TargetSeries_X}" /> This crashes because, I believe, it thinks the bindings are the values to plot or some sort of mismatch. Second attempt <chartingToolkit:ScatterSeries x:Name="TargetSeries" DataPointStyle="{StaticResource TargetStyle}" ItemsSource="{Binding Path=TargetSeriesData}" IndependentValuePath="{Binding Path=TargetSeries_X}" DependentValuePath="{Binding Path=TargetSeries_X}" /> This crashes during the init step becaue the Path properties aren't backed with dependency properties and therefore cannot be bound. Third attempt <chartingToolkit:ScatterSeries x:Name="TargetSeries" DataPointStyle="{StaticResource TargetStyle}" ItemsSource="{Binding Path=TargetSeriesData}" IndependentValuePath="targetFooXColumnName" DependentValuePath="targetFooYColumnName" /> Now this works! But I wanted to use the binding so I can switch from using the targetFooXColumnName to the targetFooBarXColumnName. So this solution will cause a whole lot of hacky looking code to switch the Path's manually. Anyway to fix this? Can I use some sort of convertor to get the Binding properties to correctly pull the data from the columns in the DataView? Thanks, Joel

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• Exception during secure communication implementation

  - by Liran

  hi everyone. im trying to implement simple secured client server communiction using WCF. when im launching mt server everty thing is OK , But when im launching my client im getting this error: Error : An error occurred while making the HTTP request to https://localhost:800 0/ExchangeService. This could be due to the fact that the server certificate is not configured properly with HTTP.SYS in the HTTPS case. This could also be caus ed by a mismatch of the security binding between the client and the server. this is the server code : Uri address = new Uri("https://localhost:8000/ExchangeService"); WSHttpBinding binding = new WSHttpBinding(); //Set Binding Params binding.Security.Mode = SecurityMode.Transport; binding.Security.Transport.ClientCredentialType = HttpClientCredentialType.None; binding.Security.Transport.ProxyCredentialType = HttpProxyCredentialType.None; Type contract = typeof(ExchangeService.ServiceContract.ITradeService); ServiceHost host = new ServiceHost(typeof(TradeService)); host.AddServiceEndpoint(contract, binding, address); host.Open(); this is the client configuration (app.config): </client> <bindings> <wsHttpBinding> <binding name="TradeWsHttpBinding"> <security mode="Transport"> <transport clientCredentialType="None" proxyCredentialType ="None"/> </security> </binding> </wsHttpBinding> </bindings> the security configuration at both the client and the server are the same , and i dont need certificate for the server in that kind of security (transport) so why do i get this exception ???? thanks...

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• Visual Studio Key board Binding Poster

  - by Jeev

  If you prefer to use keyboard short cuts more than the mouse   ,please find below the links for the Visual studio Keyboard Binding PostersVisual Studio 2010 (inludes links for C++,VB,C# & F#)Visual Studio 2008 (C#) Visual Studio 2008(VB)

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• Silverlight 3 Data Binding: Imperative and Mixed Approaches

  In the first part of this multi-part series on data binding in Silverlight we learned how to use the declarative XAML syntax approach. In this second part we ll learn how to use the imperative approach and how to combine the two.... Test Drive the Next Wave of Productivity Find Microsoft Office 2010 and SharePoint 2010 trials, demos, videos, and more.

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• C# Com Late Binding Event

  This article is a guide to building a .net component ,using it in a Vb6 project at runtime using late binding, attaching it's events and get a callback.

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