The WorkflowInvoker is a stateless static class invoking a Workflow from WCF using the following steps:

• Create Invoker (plumbing WCF + WF included an operation ...

The one is an application just like chatroom using by duplex. The other one shows the Async callback using by duplex.

WCF offers a the client a facility for dispatching calls to the service asynchronously. This is strictly a client-side feature, and the service itself is completely unaware that it is being called asynchronously. The client obviously needs a way to be notified when the calls complete and be able to ...

The download contains an interesting concept – a service that acts like a timer, calling back to its clients on requested intervals. The service actually uses the .NET timer and delegates, and is a nice demo of how to bridge the two technologies - the timer delegates and the WCF callbacks.

When callbacks enter the client, they do so on a worker thread. If the callback object is a Windows Forms object, that worker thread cannot access the form directly, and instead, the call must be marshaled to the UI thread. Fortunately, WCF can do that automatically for you. Simply call the proxy on ...

By default, WCF will establish an affinity between the service host and the synchronization context it was created on. Since by default there is no synchronization context, client calls are services on arbitrary worker threads. The download contains a custom .NET 2.0 synchronization context that ...

On the service side, WCF lets you define and use a contract hierarchy simply by applying the ServiceContract attribute at every level of the interface hierarchy, deriving and implementing it. The service can even expose a single endpoint for all contracts. However, the imported metadata definitions ...

While C# and VB.NET will let you overload interface methods, by default, WCF will not let you overload contract operations. However, using simple aliasing you could provide both the service and the client the overloaded programming model, as shown in the download.

WCF lets the client and the service version independently their definitions of the same data contract. If the client sends a type with a missing member the service expects, the missing member on the service side will be initialized to its default value. If the data type contains a member the service ...

While the default behavior of a data contract type is to simply ignore extraneous unexpected members, you can instruct it to still store and pass it along to and from the service by implementing IExtensibleDataObject. This enables a round-trip scenario, where a new client is calling an old service ...

The Metadata Explorer is a helper utility that visualizes the available service endpoints of a running service. This is done using metadata exchange - roughly the WCF equivalent of .NET reflection. Metadata contains not just contracts and operations but also information about security, transactions, ...

WCF supports three classics instance management modes: per-call assigned a new instance per request, per-session assigns a private instance for the client for the duration of the session, and a singleton instance serves all clients regardless of sessions and connections. You control these modes ...

WCF lets you configure the service to have a sharable session, thus allowing two clients to share a reference to the same service instance. But configuring for a sharable session is not enough: you have to manually rework the generated proxy and resolve references. The download shows the required ...

The classic use for callbacks in WCF is for events. The service can maintain a list of callbacks, and notify them when some event takes place on the service side. The service contract can define subscribe and unsubscribe operations, and take a masked enum to allow the clients to chose which event to ...

An occasionally connected service can issue direct synchronous calls when connected and queued called over MSQM when disconnected. The download contains a service that exposes both a queued and regular endpoint. The client uses the network events to monitor the network status, and uses the queued ...

WCF allows you to combine the work of multiple threads in a single transaction. You need to provide each worker thread with a clone of the original transactions, and signal to the original client thread when the worker threads have completed their work. The download shows a simple banking ...

A transactional service can interact not just with databases but also with volatile resource managers. The download makes use of IDesign’s implementation of the transactional collections (now part of MSDN). The service and client configuration is exactly the same as with the database centric ...

This sample will subscribe to the Channel_Closing event to inform the server when a channel has been closed. In addition, it subscribes to the ServiceHost_closing event to notify all its clients when it's closing as well.

The sample uses WSDualHttpbinding and the NetTCPBinding and stores ...

The Web Service Transfer (WS-Transfer) represents a specification to capture the current or intended state of the resource and transferring that representation between components. It is an abstraction of the architectural elements within the distributed heterogeneous systems. The WS-Transfer ...

A hello world equivalent of the MessageInspector sample in the SDK. This enabels simple client Message inspection.

This WCF example works with the Feb 06 CTP bits and the AdventureWorks demo database in SQL 2005. It illustrates mixing and matching synchronous and asynchronous processing in a WCF service and client. Specifically, the code shows: 1) a synchronous client invoking a synchronous service 2) a ...

This sample demonstrates the use of IExtension to store state at the ServiceHost level, the Instance level and the operation level. The server is self-hosted with two separate servicehost's. One servicehost contains one endpoint and the other contains three. Each contract contains two operations. ...

The DynamicProxy allows you to create the dynamic WCF client at runtime by specifying the WSDL URI of the service. The DynamicProxy does not depend on the precompiled proxy or configuration. The DynamicProxy uses the MetadataResolver to download the metadata from the service and WsdlImporter to ...

This sample application demostrates how duplex channels can be used over HTTP in Indigo.

It simulates a reporter at a football match sending in match updates to the Broadcaster. The Broadcaster (via a callback) sends the current league standings using the latest results, to all ...

This project consists of a bingo game that uses duplex communication. It also contains two client implementations, one using Windows Forms and the other using Avalon (WPF).

This sample demonstrates a basic implementation of a “pinning router.” A pinning router belongs to a class of SOAP intermediaries whose job is to selectively pick a service instance from a “service farm” for each client’s session, and from then on forward all messages coming from that client on that ...