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Often you will need to raise additional events from objects that follow the BackgroundWorker design pattern. For example, let s say you want to augment IterativeBackgroundWorker to raise an event when the worker starts its work and for this event to pass the exact time that the worker thread started as an event argument. Listing 13-3 shows the extra code you need to add to the IterativeBackgroundWorker type to make this happen. We use this extra code in the next section. Listing 13-3. Code to Raise GUI-Thread Events from an IterativeBackgroundWorker Object open System open System.Threading type IterativeBackgroundWorker<'a>(...) = let worker = ... // The constructor captures the synchronization context. This allows us to post // messages back to the GUI thread where the BackgroundWorker was created. let syncContext = SynchronizationContext.Current do if syncContext = null then failwith "no synchronization context found" let triggerStarted,started = IEvent.create()

The primary function of Csla.DataPortal is to determine the appropriate network protocol (if any) to be used when interacting with Csla.Server.DataPortal. Each protocol is managed by a proxy object that implements the Csla.DataPortalClient.IDataPortalProxy interface. This interface will be discussed shortly, but for now it is enough to know that it ensures that all proxy classes implement the methods required by Csla.DataPortal. The proxy object to be used is defined in the application s configuration file. That s the web. config file for ASP .NET applications, and myprogram.exe.config for Windows applications (where

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// Raise the event when the worker starts. This is done by posting a message // to the captured synchronization context. do worker.DoWork.Add(fun args -> syncContext.Post(SendOrPostCallback(fun _ -> triggerStarted(DateTime.Now)), state=null) ... /// The Started event gets raised when the worker starts. It is /// raised on the GUI thread (i.e. in the synchronization context of /// the thread where the worker object was created). // It has type IEvent<DateTime> member x.Started = started The simple way to raise additional events is often wrong. For example, it is tempting to simply create an event, arrange for it to be triggered, and publish it, as you would do for a GUI control. However, if you do that, you will end up triggering the event on the background worker thread, and its event handlers will run on that thread. This is dangerous, because most GUI objects (and many other objects) can be accessed only from the thread they were created on; this is a restriction enforced by most GUI systems. One of the nice features of the BackgroundWorker class is that it automatically arranges to raise the RunWorkerCompleted and ProgressChanged events on the GUI thread. We have shown how to achieve this in Listing 13-3. Technically speaking, the extended IterativeBackgroundWorker object has captured the synchronization context of the thread where it was created and posts an operation back to that synchronization context. A synchronization context is just an object that lets you post operations back to another thread. For threads such as a GUI thread, this means posting an operation will post a message through the GUI event loop.

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