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The BackgroundWorker also provides built-in support for tracking progress, which is useful for keeping the client informed about how much work has been completed in a long-running task.

The results of this code are as follows: H data: Harry None H data: Jane H data: Hillary None H data: John H data: Henry

To add support for progress, you need to first set the BackgroundWorker WorkerReportsProgress property to true Actually, providing and displaying the progress information is a two-step affair First, the DoWork event handling code needs to call the BackgroundWorkerReportProgress() method and provide an estimated percent complete (from 0 to 100) You can do this as often as you like Every time you call ReportProgress(), the BackgroundWorker fires the ProgressChanged event You can react to this event to read the new progress percentage and update the user interface Because the ProgressChanged event fires from the user interface thread, there s no need to use ControlInvoke() Supporting this pattern in the current example is a little more work Currently, the majority of the work is performed in response to a single method call WorkerFindPrimes() But to provide progress information, you need to call ReportProgress() during the prime search.

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Figure 7-12. Choosing to start a manual backup from the task tray 2. Enter a description for this backup, as shown in Figure 7-13. You can leave the description as Manual Backup if you wish, but replacing it will certainly make things easier for you if you later need to restore files from this backup. I suggest you enter a useful description; for example, you could enter something like Added Holiday Photos for the backup that contains your new digital pictures.

To make this possible, you must split the search into several pieces, or give the Worker class the ability to report progress In this example, you ll see the second approach To add support to the Worker class, start by adding a third parameter to the FindPrimes() method, as shown here: public static int[] FindPrimes(int fromNumber, int toNumber, SystemComponentModelBackgroundWorker backgroundWorker) { .. } The FindPrimes() method is also changed to report progress periodically Reporting progress usually involves a calculation, an event, and a refresh of the form s user interface As a result, you want to cut down the rate of progress reporting to one or two updates per second In the FindPrimes() method, progress is reported only in one-percent increments: int iteration = listLength / 100; for (int i = 0; i < listLength; i++) { ...

// Report progress only if there is a change of 1% // Also, don't bother performing the calculation if there // isn't a BackgroundWorker or it doesn't support progress notifications if ((i % iteration == 0) && (backgroundWorker != null) && backgroundWorkerWorkerReportsProgress) { backgroundWorkerReportProgress(i / iteration); } } Now the only remaining step is to respond to the ProgressChanged event and update a progress control in the status bar: private void backgroundWorker_ProgressChanged(object sender, ProgressChangedEventArgs e) { progressPanelValue = eProgressPercentage; } Figure 20-8 shows the progress meter while the task is in progress..

It is also possible to transform the data before it reaches the event handlers. You do this using the map function provided in the Event module. The following example demonstrates how to use it: let event = new Event<string>() let newEvent = event.Publish |> Event.map (fun x -> "Mapped data: " + x) newEvent.Add(fun x -> printfn "%s" x) event.Trigger "Harry" event.Trigger "Sally" The results of this code are as follows: Mapped data: Harry Mapped data: Sally This section has just provided a brief overview of events in F#. You will return to them in more detail in 8 when I discuss user interface programming, because that is where they are most useful.

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