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In the previous section you saw that for value parameters, the system allocates memory on the stack for the formal parameters. In contrast, for reference parameters: The formal parameter name acts as if it were an alias for the actual parameter variable; that is, it acts as if it referred to the same memory location.

The DispatcherTimer works by hooking its Tick event up to a method that will be called on a periodic basis. You specify how often the Tick event is raised by passing a TimeSpan to the DispatcherTimer constructor or by setting the Interval property to the TimeSpan. The timer is then started via the Start method and stopped via the Stop method. Here s code that counts to 20 in one-second intervals, displaying each number on the user interface: private int count = 0; DispatcherTimer timer; private void startTimer_Click(object sender, RoutedEventArgs e) { if (startTimer.Content.ToString()=="Start Timer") { timer = new DispatcherTimer(); timer.Interval = new TimeSpan(0, 0, int.Parse(intervalTimeTextBox.Text)); timer.Tick += new EventHandler(timer_Tick); timer.Start(); startTimer.Content = "Stop Timer"; } else { timer.Stop(); startTimer.Content = "Start Timer"; } } void timer_Tick(object sender, EventArgs e) { count++; outputText.Text = "Tick count: " + count; if (count == 20) ((DispatcherTimer)sender).Stop(); }

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Since the formal parameter name and the actual parameter name are acting as if they reference the same memory location, clearly any changes made to the formal parameter during method execution are visible after the method is completed, through the actual parameter variable.

Listing 2-25. Parent Entity Object Instantiating the Embedded Entity Object at the Create Time private void _InsertUser() { User user = new User(); user.Password = txtPassword.Text.Trim(); Person person = new Person(txtFirstName.Text.Trim(), txtLastName.Text.Trim(), txtMiddelInitial.Text.Trim(), txtSufix.Text.Trim(), user.GetRowKey()); user.SetDependencyEntity(person); Address address = new Address(txtAddress1.Text.Trim(), txtAddress2.Text.Trim(), txtCity.Text.Trim(), (State)combState.SelectedIndex, txtZip.Text.Trim(), txtCounty.Text.Trim(), txtCountry.Text.Trim(), person.GetRowKey()); person.SetDependencyEntity(address);

The Timer in the SystemThreading namespace does basically the same thing, but the work (in the form of a callback method passed to Timer) is done on a thread from the thread pool The method that does work on a periodic basis is specified as a parameter to the Timer constructor There are five overloads of this constructor, each providing a different way to specify how often the work method is invoked You can also optionally pass extra state information The most important parameter to each constructor is TimerCallback, used to wrap the method that does the work The dueTime parameter is used to specify delay before the timer starts, and the period parameter is used to specify delay between each subsequent invocation of the callback.

For example, the following code shows method MyMethod again, but this time the parameters are reference parameters rather than value parameters: class MyClass { public int Val = 20; }

If dueTime or period is set to infinite, each is effectively disabled (an infinite due time, for example, causes the timer to never start) A due time of zero causes the timer to start immediately, and a period of zero causes the work method to get invoked only once Timer(TimerCallback): Creates a timer with an infinite due time and infinite period, preventing the timer from invoking the callback Use the Change method to set a new due time/period The state object is the Timer itself Timer(TimerCallback, object state, Int32 dueTime, Int32 period): Creates a timer with a custom state object (useful for passing information to the work method), and a due time and period in milliseconds Timer(TimerCallback, object state, Int64 dueTime, Int64 period): Same as the Int32 version, but provides the ability to specify lengths of time that can t be represented in a 32-bit integer.

class Program ref modifier ref modifier { static void MyMethod(ref MyClass f1, ref int f2) { f1.Val = f1.Val + 5; // Add 5 to field of f1 param. f2 = f2 + 5; // Add 5 to second param. } static void Main() { MyClass a1 = new MyClass(); int a2 = 10; } } MyMethod(ref a1, ref a2); ref modifiers // Call the method.

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