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In .NET, there is no general-purpose way to trigger code on specific threads. The Control.Invoke() method is a special exception to this rule that makes writing multithreaded Windows applications much easier. When you call Control.Invoke(), the code checks that the control is created and its Windows handle exists. If its handle exists, the rest of the process is straightforward. The Invoke() method uses the GetWindowThreadProcessId() Win32 API function to find the thread ID for the control, and then compares that value against the currently executing one using GetCurrentThreadId(). This stage determines whether or not marshalling is needed. Life becomes much more ugly if the control s handle isn t created yet. In this case, the Invoke() method walks the control hierarchy trying to find out if the control s parent (or its parent s parent, and so on), have been created yet. If they have, the Invoke() method grabs that thread ID. If you re facing erratic behavior or you think your Control.Invoke() method is taking longer than it should because you re using Invoke() on a control that is created dynamically, you have two possible solutions. You can access the Control.Handle property in your code before you call the Invoke() method, which ensures that the control handle is created. (Of course, you'll need to access Control.Handle from the main application thread.) Or, you can skip directly to the parent by calling the Invoke() method of a container control or the hosting form.

Figure 7-8. Folders that are automatically excluded from the backup process 7. Click the Add button in order to specify other folders to be excluded from the backup. A list of all folders on that volume will appear, as shown in the example in Figure 7-9.

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Finally, to marshal your call, Control.Invoke() posts a message to the message queue for the user interface thread (using the Win32 API function PostMessage). As with any other event in a Windows application, this message isn t handled until your application has an idle moment. In other words, if your main thread is tied up with some intensive processing and you use Control.Invoke(), the call may be deferred for some time. Similarly, when your call does execute, it will temporarily take control away from your main thread. For the same reason, make sure that you perform any processor-intensive work on the separate thread before you use Control.Invoke(). For a more detailed look at the implementation behind Control.Invoke(), refer to Justin Rogers's post at http://weblogs.asp.net/justin_rogers/articles/126345.aspx.

In addition to this basic event functionality, the F# Event module provides a number of functions that allow you to filter and partition events to give fine-grained control over which data is passed to which event handler.

The technique shown in the previous example works great when you want to perform a single asynchronous task and update the user interface once it completes However, in many situations you ll simply want to take the data that the asynchronous worker provides, and store it somewhere for later use One reason to take this step is to avoid interrupting other work the user is performing For example, consider an application that shows a product catalog in a grid control You might fetch an updated DataSet from a Web service, but you probably don t want to refresh the grid immediately That s because the user might be looking at a specific row, or even performing an edit.

Instead, a better approach is to provide a message in a status bar informing the user that new data is available, and allow the user to click a button to refresh the grid at the right time The problem with this type of scenario is that you need a place to store the data until you decide to display it A form member variable makes perfect sense for this storage However, it also introduces a new problem thread synchronization The problem is that it s not safe for you to access any data from more than one thread That s because there s a possibility that both the main thread and your asynchronous thread would try to manipulate the same object at the same time, which leads to unpredictable behavior and, occasionally, incorrect or corrupted data There are two ways to resolve this problem: Use the ControlInvoke() method.

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