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WebSockets with WCF
Notification & “Duplex communication” are important scenario over the internet but firewalls and browser limitations makes them very hard to implement. In the browser world, tricks like long polling is commonly used to implement server-push requirements. For non-browser scenarios relay...
24 Nov 2011
Pub/Sub with WCF (Part 2)
Source Code Download Service Bus May CTP has a small glitch when it comes to pub/sub messaging using the WCF programing model. The May CTP API out-of-box doesn’t pick up filter/promoted properties from the WCF data contracts and requires you to explicitly specify these properties on the BrokeredMessage...
2 Jun 2011
Pub/Sub with WCF (Part 1)
In yesterday’s post I have explored how to use Service Bus queues as a transport to communicate between a WCF client and a service. In today’s post I will show you WCF pub/sub messaging using the topics and subscriptions. A subscription behaves exactly like a queue for reads while a topic...
31 May 2011
WCF with Service Bus V2: Queues
May CTP of Service Bus introduced tons of new messaging capabilities including Queuing and Topic based pub/sub messaging. Check out Clemens post for an overview. The usage of Service Bus messaging entities (Queues, Topics) is divided across two namespaces – a ‘Management Namespace’...
24 May 2011
Initializing Auto-Start WCF/Workflow Services
AppFabric AutoStart feature is built on top of IIS 7.5 AutoStart feature. IIS 7.5 provides an extensibility point where you can specify your custom initialization providers which will be executed as part of application start-up and gives you the ability to perform costly initialization. For example,...
30 Nov 2010
WCF Reliable Messaging Retransmission Algorithm
When configuring WS-Reliable messaging, you would notice that even though number of retries (MaxRetryCount) is configurable but the interval in which retries are attempted is NOT configurable. This is because WCF uses an exponential back-off congestion control algorithm to calculate the retry timeout...
9 Nov 2010
PasswordDigest authentication in WCF
WS-Security UsernameToken Profile describes how a client can authenticate to a web service using a "username" and a password. Two variations of the password are defined as part of the specification which includes "PasswordText" and "PasswordDigest". Neither WCF nor WIF out of box support "PasswordDigest...
3 Aug 2010
Creating Objects Without Calling the Constructor
When you use the new operator to create an instance of a class, the class constructor is called before the reference to the newly created object is returned. This also applies to the reflection scenarios where you call Activator.CreateInstance , which finds the right constructor based on the number,...
4 May 2010
Custom ServiceHostFactory for a XAMLX based Service
For IIS/WAS hosted services backed by a physical .SVC file (WCF 3.0/3.5) you can specify a custom ServiceHostFactory in the .svc file as part of service specification . There is no such declaration for XAMLX files and instead you can use config-based activation feature to achieve the same result. ...
29 Apr 2010
Adding Dynamic methods to a WCF Service
Someone asked me if it’s possible to add a Ping method to every service contract without repeatedly defining it in each service contract? The answer is yes & and it’s fairly simply too. Here I have a LoginService, which require that implicit Ping method ( DateTime Ping...
18 Feb 2010
Polymorphism in WCF
Polymorphism in any OO language is taken as a given – and people would be shouting about it a lot if a language didn’t support it. However, when you’re writing a service interface with WCF you might also want to permit some form of polymorphic behaviour at runtime. I was working with a customer yesterday...
20 Oct 2009
Using base types in WCF
I was recently asked if it's possible to expose a base type (maybe an abstract class or interface) as a parameter in a WCF operation and allow different types to be specified when invoked. Unsurprisingly, the WCF guys thought of this and included some attributes to help. Let's imagine we have an interface...
22 Sep 2009
Design: Architecture Frame Considerations (Part 1)
At Microsoft we are working hard in putting together the different components that are involved deciding the architecture approach. One of these components is the architecture frame, which together with the architecture style and application type creates the architectural baseline for modern design....
14 Jan 2009
WCSF Application Architecture 7: Remote Logic with WCF Services
This article is 7th part of the WCSF Application Architecture series by Simon Ince; WCSF Application Architecture 1: Introduction WCSF Application Architecture 2: Application Controller WCSF Application Architecture 3: Model View Presenter WCSF Application Architecture 4: Environment...
5 Dec 2008
'Windows Communication Foundation (WCF)' in a Day Workshop
Just one of the services we offer in the ADC team is technology / product workshops. Please find details below of the 'WCF in a Day' workshop we currently offer. For existing customers, if you would like take advantage of this workshop within your organisation, please contact your ADC. If you are not...
23 Oct 2008
WCSF Application Architecture 1: Introduction
Simon Ince has put together and excellent series of articles answering the question of how to write real world applications using the Web Client Software Factory (WCSF), Simon is still working on this series so stay tuned for more posts on this subject! One of the questions I get a lot from customers...
17 Oct 2008
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