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Creator QR-Code in C#.NET PART II

PART II
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The output is shown here (The precise output that you see may differ slightly based on task load, operating system, etc)
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Main thread starting MyTask() starting
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Part II:
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In MyTask(), count is 0 In MyTask(), count is 1 In MyTask(), count is 2 In MyTask(), count is 3 In MyTask(), count is 4 In MyTask(), count is 5 In MyTask(), count is 6 In MyTask(), count is 7 In MyTask(), count is 8 In MyTask(), count is 9 MyTask terminating Main thread ending
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It is important to understand that, by default, a task executes in a background thread Thus, when the creating thread ends, the task will end This is why ThreadSleep( ) was used to keep the main thread alive until MyTask( ) completed As you would expect and will soon see, there are far better ways of waiting for a task to finish In the foregoing example, the task to be concurrently executed is specified by a static method However, there is no requirement to this effect For example, the following program reworks the previous one so that MyTask( ) is encapsulated within a class:
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// Use an instance method as a task using System; using SystemThreading; using SystemThreadingTasks; class MyClass { // A method to be run as a task public void MyTask() { ConsoleWriteLine("MyTask() starting"); for(int count = 0; count < 10; count++) { ThreadSleep(500); ConsoleWriteLine("In MyTask(), count is " + count); } ConsoleWriteLine("MyTask terminating"); } } class DemoTask { static void Main() { ConsoleWriteLine("Main thread starting"); // Construct a MyClass object MyClass mc = new MyClass(); // Construct a task on mcMyTask() Task tsk = new Task(mcMyTask);
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24:
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M u l t i t h r e a d i n g , P a r t Tw o : E x p l o r i n g t h e Ta s k P a r a l l e l L i b r a r y a n d P L I N Q
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// Run the task tskStart(); // Keep Main() alive until MyTask() finishes for(int i = 0; i < 60; i++) { ConsoleWrite(""); ThreadSleep(100); } ConsoleWriteLine("Main thread ending"); } }
PART II
The output is the same as before The only difference is that MyTask( ) is now called on an instance of MyClass One other important point about tasks needs to be made now: once a task completes, it cannot be restarted Thus, there is no way to rerun a task without re-creating it
Use a Task ID
Unlike Thread, Task does not include a name property It does, however, have an ID property called Id, which can be used to identify the task Id is a read-only property of type int It is shown here: public int Id { get; } A task is given an ID when it is created The ID values are unique, but unordered Therefore, the ID of a task begun before another might not be lower in value You can find the ID of the currently executing task by using the CurrentId property This is a read-only static property, which is declared like this: public static Nullable<int> CurrentID { get; } It returns the ID of the currently executing task or null if the invoking code is not a task The following program creates two tasks and shows which task is executing:
// Demonstrate the Id and CurrentId properties using System; using SystemThreading; using SystemThreadingTasks; class DemoTask { // A method to be run as a task static void MyTask() { ConsoleWriteLine("MyTask() #" + TaskCurrentId + " starting"); for(int count = 0; count < 10; count++) { ThreadSleep(500); ConsoleWriteLine("In MyTask() #" + TaskCurrentId + ", count is " + count ); }
Part II:
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