Service Synchronization Context
The programming techniques shown so far put the onus of
accessing the resource on the correct thread squarely on the service or
resource developer. It would be preferable if the service had a way of
associating itself with a particular synchronization context, and could
have WCF detect that context and automatically marshal the call from the
worker thread to the associated service synchronization context. In
fact, WCF lets you do just that. You can instruct WCF to maintain an
affinity between all service instances from a particular host and a
specific synchronization context. The ServiceBehavior
attribute offers the UseSynchronizationContext Boolean property,
defined as:
[AttributeUsage(AttributeTargets.Class)]
public sealed class ServiceBehaviorAttribute : ...
{
public bool UseSynchronizationContext
{get;set;}
//More members
}The affinity between the service type, its host, and a
synchronization context is locked in when the host is opened. If the
thread opening the host has a synchronization context and UseSynchronizationContext is true, WCF will establish an affinity between
that synchronization context and all instances of the service hosted by
that host. WCF will automatically marshal all incoming calls to the
service’s synchronization context. All the thread-specific information
stored in the TLS, such as the client’s transaction or the security
information (discussed in Chapter 10), will be marshaled correctly to the synchronization context. ...
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