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Question 18: }
You need to ensure that worker can be properly canceled.
Which code segment should you use to replace line 11?
A. var cancel = (sender as BackgroundWorker).CancellationPending
if(cancel) {
(sender as BackgroundWorker).CancelAsync()
break
}
else {
InvokeLongRunningProcessStep()
}
B. var cancel = (sender as BackgroundWorker).CancellationPending
if(cancel) {
e.Cancel = true
break
}
else {
InvokeLongRunningProcessStep()
}
C. var cancel = e.Cancel
if(cancel) {
(sender as BackgroundWorker).CancelAsync()
break
}
else {
InvokeLongRunningProcessStep()
}
D. var cancel = e.Cancel
if(cancel) {
e.Cancel = true
break
}
else {
InvokeLongRunningProcessStep()
}
Correct Answer: B
12.You are developing an application by using Silverlight 4 and Microsoft.NET Framework 4.
You add a BackgroundWorker object named worker to the application. You also add a CheckBox control
named checkBox and a TextBlock control named statusTextBlock.
You add the following code segment. (Line numbers are included for reference only.)
01 public MainPage()
02 {
03 InitializeComponent()
04 worker.WorkerReportsProgress = true
05 worker.DoWork += new DoWorkEventHandler(worker_DoWork)
06 worker.ProgressChanged += new ProgressChangedEventHandler(worker_ProgressChanged)
07 }
08 private void worker_DoWork(object sender, DoWorkEventArgs e)
09 {
10 for (int i = 0
i < 100
i++) {
11 bool isChecked = checkBox.IsChecked.HasValue && checkBox.IsChecked.Value
12 ExecuteLongRunningProcessStep(isChecked)
13 worker.ReportProgress(i)
