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WCF Duplex Messaging
I am one of the moderators of the MSDN WCF Forum. However, the first three of these are supported natively in WCF and are known as One-way, request/response and duplex. Duplex Contracts in WCF. In WCF this idea is modelled by the contract. WSHttpBinding is the default for the built in WCF projects but it does not support duplex messaging. It will also need to supply this implementation to the WCF infrastructure and it does this by wrapping an instance in an InstanceContext object and passing it to the proxy constructor. Tags: NET;Azure;WCF
- Tuesday, June 9, 2009
WCF Instances and Threading
I have just found myself answering essentially the same question 4 times on the MSDN WCF Forum about how instances, threading and throttling interact in WCF. WCF has 3 built in instancing models: PerCall, PerSession and Single. By default WCF assumes you do not understand multithreading. Unless you turn on ASP.NET Compatibility, WCF calls are processed on IO threads in the system threadpool. You can control the throttle values using the serviceThrottling service behavior which you set in the config file or in code.NET;WCFInstancing. Concurrency.
- Friday, February 4, 2011
Digging into WCF REST
Last Thursday evening I presented a talk to the Dallas.NET User Group on support in WCF 4 for building REST-ful services. Building REST-ful Services with the WCF Web Programming Model REST is defined as an architectural style for building services that embrace the principles of the web. He’ll also get down and dirty using the WCF Web Programming Model and show how WCF makes it easy to serve up POX or JSON, increasing the reach of your services to clients that don’t understand or care about SOAP. WCF 3.5 WCF 4.0 Technical WCFEnjoy.
Tony and Zuzana's World
- Saturday, September 10, 2011
Using Silverlight to Access WIF secured WCF Services
Another technology that comes up very often is Silverlight – and especially the “story” of Silverlight and WCF/WIF. Those of you with WCF background will say: “that’s what the federation bindings in WCF are for”. In WCF you can work around that problem by adding the ValidateMustUnderstand behavior to the client stack. Tags: IdentityModel WCF This topic comes up quite often recently – so I hope the title is search engine friendly. Disclaimer: At the time of this writing, the current version of Silverlight is v3 and WIF is in beta 2. Passive. Active. WSTrust13.
- Wednesday, October 28, 2009
Inversion of control and WCF
One of these case is with an WCF service where WCF takes care of the service lifetime and creates new objects as needed. Fortunately WCF is designed in a very modular fashion itself and allows you to replace almost everything in the box. Basically WCF uses an implementation of the IInstanceProvider to create new service objects. Using Ninject with WCF There are plenty of IOC containers to choose from but I like Ninject and that is available through NuGet so that is what I will use for this example. www.dotnetevents.nl.NET WCF VS2010 NuGetrepo = repo; }.
The Problem Solver
- Tuesday, April 19, 2011
Using Ninject with WCF Services
In an ASP.NET MVC application, it is possible to use repositories directly from controllers, but it may be desirable to place a WCF services façade over the data access layer, so that other kinds of clients, such as Silverlight or WPF, won’t directly access the database. This works great for configuring a WCF service to use dependency injection, but there are times when you might need to spin up a WCF service for an integration test using a testing framework such as NUnit or MSTest. Technical DI Ninject WCFDownload the code for this post. Enjoy.
Tony and Zuzana's World
- Monday, October 24, 2011
Roll Your Own REST-ful WCF Router
Recently I’ve been tasked with building a WCF routing service and faced the choice of whether to go with the built-in router that ships with WCF 4.0 , or to build one from scratch. However, as the MSDN documentation for the WCF Router states, “ The Routing Service does not currently support routing of WCF REST services. In fact, using the BasicHttpBinding with AspNetCompatibility enabled on the built-in WCF router results in a somewhat cryptic error : “Shouldn’t allocate SessionChannels if session-less and impersonating.”. Technical WCFEnjoy.
- Tuesday, April 24, 2012
Ninject WCF Extensions for RESTful Services
while ago I blogged about using Ninject for dependency injection with WCF Services. The problem with WCF services is that by default they are required to have a parameterless constructor, which does not play nice with DI containers, such as Ninject , which support injection of dependencies via constructor parameters. had the need recently to set up a REST-style WCF Services project and wanted to use Ninject for DI with it. Luckily, the Ninject WCF Extension project had been updated to support REST, so I updated the Nuget package and discovered the project would not compile.
- Sunday, April 8, 2012
WF4&WCF and message correlation
In the previous blog posts, here , here and here , I demonstrated how to use WCF from WF4. One of the ugly parts of Windows Workflow Foundation 3 was the message correlation part when you used WCF to send multiple messages to the same workflow. This guid was the workflow instance ID but having to use that on the client means the client had to be very aware of the server technology used, something that goes against the principals of WCF. No longer do we need to use the “context” bindings but the standard WCF bindings will do just fine. Much better! OperationContract].
The Problem Solver
- Wednesday, September 2, 2009
Building Scalable and Secure WCF Services
The key to building scalable WCF services is to eliminate binding configurations that could result in server affinity. Nevertheless, there is one wrinkle: by default the WCF HTTP bindings enable Keep-Alive , which can result in server affinity and thereby impede scalability in a load-balanced environment. The problem here is that WCF will not allow you to pass credentials, such as username and password, over a non-secure channel. The trick is to fool WCF into thinking we are using a secure channel when in fact we are not. Technical REST SOAP WCFEnjoy.
- Monday, June 18, 2012