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A method can return a value to the calling code. The returned value is inserted into the calling code at the position in the expression where the invocation occurred. To return a value, the method must declare a return type before the method name. If a method doesn t return a value, it must declare a return type of void.

If you want to execute some code on an alternate thread, you can place the code to execute in its own method and then pass this method to the Thread class s constructor (by wrapping the method in a ThreadStart object). Note that to make use of this class, you need to add the namespace System.Windows.Threading. We ll use the following method to simulate some work: public void doSomething() { Thread.Sleep(5000); // 5 seconds Dispatcher.BeginInvoke(delegate() { statusText.Text = "Work done."; }); } The code for this chapter contains a simple interface with a button control that is used to start a thread executing the doSomething method. You can repeatedly click the startThreadButton-named button to see the current state of the thread. You should see the state go from Running to WaitSleepJoin and finally to Stopped after the five-second sleep period is over. Here s the event handler for the startThreadButton-named button that creates and starts the thread: private void startThreadButton_Click(object sender, RoutedEventArgs e) { currentThread = new Thread(new ThreadStart(doSomething)); currentThread.Start(); statusText.Text = "Thread created and started"; threadStateText.Text = currentThread.ThreadState.ToString(); } The Thread constructor uses the ThreadStart class to wrap the method that does the work. There is an alternate class, ParameterizedThreadStart, which is used when you want to pass an object to the method that performs the work. This object gets passed to the Start method, which subsequently passes it to the method wrapped by ParameterizedThreadStart. A method suitable for use with ParameterizedThreadStart takes a single object as a parameter. public void gotoSleep(object time) { int timeToSleep = (int)time; Thread.Sleep(timeToSleep); } Starting the thread is accomplished using code similar to the nonparameterized ThreadStart class, but with the ParameterizedThreadStart delegate passed to the constructor, as shown here:

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The following code shows two method declarations. The first returns a value of type int. The second doesn t return a value. Return type int GetHour() { ... } void DisplayHour() { ... } No value is returned. A method that declares a return type must return a value from the method by using the following form of the return statement, which includes an expression after the keyword return. Every path through the method must end with a return statement of this form. return Expression; Evaluates to a value of the return type // Return a value.

currentThread = new Thread(new ParameterizedThreadStart(delegate { gotoSleep(7500);})); Although this is an effective way to create a thread to do some processing, it has several problems The main problem is that creating a thread is expensive, and if you continue to create threads like this, your application s performance might be impacted, since the environment handles the creation and eventually the cleanup of threads To address this problem, you should use something called the thread pool, which contains a number of already created threads ready to jump into action and do some work The thread pool automatically handles the allocation, creation, and cleanup of threads If your application requires a larger number of threads than the thread pool already has, then new threads are created and added to the pool.

For example, the following code shows a method called GetHour, which returns a value of type int. Return type int GetHour( ) { DateTime dt = DateTime.Now; int hour = dt.Hour; } return hour; Return statement

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