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Figure 20-2. A synchronous test of a long-running operation When you specify a search range and click Find Primes, the following code runs:

Using the background worker imposes few changes on the code You do need to split the code does between the DoWork and the RunWorkerCompleted events, and this means you need to write slightly more code, but this will never require more than a few extra lines Let s step though the required code changes; begin by creating a new instance of the background worker class: let background = new BackgroundWorker() You place the code that you need to happen in the background on a different thread in the DoWork event You also need to be careful that you extract any data you need from controls outside of the DoWork event Because this code happens on a different thread, letting that code interact with the GUI objects would break the rule that they should only be manipulated by the GUI thread.

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private void cmdFind_Click(object sender, EventArgs e) { this.UseWaitCursor = true; txtResults.Text = ""; lblTimeTaken.Text = ""; // Get the search range. int from, to; if (!Int32.TryParse(txtFrom.Text, out from)) { MessageBox.Show("Invalid From value."); return; } if (!Int32.TryParse(txtTo.Text, out to)) { MessageBox.Show("Invalid To value."); return; } // Start the search for primes and wait. DateTime startTime = DateTime.Now; int[] primes = Worker.FindPrimes(from, to); // Display the time for the call to complete. lblTimeTaken.Text = DateTime.Now.Subtract(startTime).TotalSeconds.ToString(); // Paste the list of primes together into one long string. StringBuilder sb = new StringBuilder(); foreach (int prime in primes) { sb.Append(prime.ToString()); sb.Append(" "); } txtResults.Text = sb.ToString(); this.UseWaitCursor = false; } This code runs without a hitch, but it also locks the user out while the work is in progress. If you start dragging the form around the screen while the Worker is searching for primes, you may see some erratic behavior. For example, the window may become a blank surface, indicating that the form hasn t yet responded to the Windows message asking it to repaint itself, or it may display the Not Responding message in the caption (see Figure 20-3). To improve on this situation, you need multithreading.

Figure 7-7. Choosing which volumes to back up 5. Ensure there is a check in the box for each volume you want to back up. If you don t want to back up a volume for whatever reason, just remove the check.

There are several ways to translate this example into a multithreaded application. Using asynchronous delegates, you can launch the Worker.FindPrimes() method on another thread. However, a much better approach is to wrap the call to Worker.FindPrimes() with another method in the form. This allows you to separate the code for updating the user interface from the code that actually performs the prime-number search, which is a key design goal. It also provides you with an extra layer of flexibility. This extra layer comes in handy if the signature of the FindPrimes() method changes. Figure 20-4 shows this design.

You can see the code you use to read the integer and wire up the DoWork event here: // parse the input to an int let input = Int32Parse(inputText) // add the "work" event handler backgroundDoWorkAdd(fun ea -> eaResult <- fib input) In the preceding example, you extract the input integer from the text box and parse it just before adding the event handler to the DoWork event Next, the lambda function you added to the DoWork event captures the resulting integer You should place the result that interests you in the DoWork event s Result property of the event argument You can then recover the value in this property can then be recovered in the RunWorkerCompleted event It two has a result property that you can see in the following code: // add the work completed event handler backgroundRunWorkerCompletedAdd(fun ea -> output.

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