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In a sense you have already seen a good deal of message passing in this chapter. For example: In the BackgroundWorker design pattern, the CancelAsync method is a simple kind of message. Whenever you raise events on a GUI thread from a background thread, you are, under the hood, posting a message to the GUI s event queue. On Windows this event queue is managed by the operating system, and the processing of the events on the GUI thread is called the Windows Event Loop. In this section we cover a simple kind of message processing called mailbox processing. This is popular in languages such as Erlang. A mailbox is a message queue that you can scan for a message particularly relevant to the message-processing agent you are defining. Listing 13-10 shows a concurrent agent that implements a simple counter by processing a mailbox as messages arrive. The type MailboxProcessor is defined in the F# library module Microsoft.FSharp. Control.Mailboxes.

Before doing any changes to the DataTable object, its BeginLoadData() method is called. This tells the DataTable that a batch of changes are about to happen, so it suppresses its normal event-handling process. This not only makes the changes more efficient to process, but avoids the possibility of the UI doing a refresh for every little change to the DataTable. Then the method loops through all the items in the source list. For each item, a new DataRow object is created, the values are copied from the source object, and the DataRow is added to the DataTable. The GetField() method, which is key to this process, is discussed in the following section. When all the data has been copied into the DataTable, its EndLoadData() method is called. This tells the object that the batch of changes is complete so it can resume its normal event, index, and constraint processing.

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We ll call our new JavaScript function displayCitations, and store it in a file called displayCitations.js. First, the function won t take any arguments, so the parentheses after the function name are empty: function displayCitations() { The first step is to gather all the blockquote elements in the document. Use getElementsByTagName and store the resultant node set as the variable quotes: var quotes = document.getElementsByTagName("blockquote"); Now start looping through this set: for (var i=0; i<quotes.length; i ++) { Inside the loop, we re interested in only quotes that have a cite attribute. We can perform a simple test to see if the current quote in the loop has this attribute. Run the test on the current element of the quotes node set, which is quotes[i]. Use getAttribute to perform the test on this node. If the result of getAttribute("cite") is true, there is a cite attribute. If the result of !getAttribute("cite") is true, there is no cite attribute. If that s the case, the keyword continue will cause the loop to jump forward to the next iteration. All the subsequent statements inside the loop will be ignored during the current iteration: if (!quotes[i].getAttribute("cite")) { continue; } You could also write it like this: if (!quotes[i].getAttribute("cite")) continue; The following statements will be performed on only blockquote element nodes that have cite attribute nodes. First, get the value of the cite attribute of the current blockquote and store it in a variable called url: var url = quotes[i].getAttribute("cite"); The next step involves figuring out where to put the link. At first, this might seem very straightforward.

Listing 13-10. Implementing a Counter Using a MailboxProcessor open Microsoft.FSharp.Control.Mailboxes let counter = MailboxProcessor.Create(fun inbox -> let rec loop(n) = async { do printfn "n = %d, waiting..." n let! msg = inbox.Receive() return! loop(n+msg) } loop(0)) The type of counter is MailboxProcessor<int>, where the type argument indicates that this object expects to be sent messages of type int.

The workhorse of CopyData() is the GetField() method. This method retrieves the specified column property or field value from the source object. Given that the source object could be a simple or complex type, GetField() is relatively long: private static string GetField(object obj, string fieldName) { string result; DataRowView dataRowView = obj as DataRowView; if (dataRowView != null) { // this is a DataRowView from a DataView result = dataRowView[fieldName].ToString(); } else if (obj is ValueType && obj.GetType().IsPrimitive) { // this is a primitive value type result = obj.ToString(); } else { string tmp = obj as string; if (tmp != null) { // this is a simple string result = (string)obj; } else { // this is an object or Structure try { Type sourceType = obj.GetType(); // see if the field is a property PropertyInfo prop = sourceType.GetProperty(fieldName); if ((prop == null) || (!prop.CanRead)) { // no readable property of that name exists // check for a field FieldInfo field = sourceType.GetField(fieldName); if (field == null)

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