qr code c# open source Using TaskFactory to Start a Task in C#

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Using TaskFactory to Start a Task
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The preceding examples are written a bit less efficiently than they need to be because it is possible to create a task and start its execution in a single step by calling the StartNew( ) method defined by TaskFactory TaskFactory is a class that provides various methods that streamline the creation and management of tasks The default TaskFactory can be obtained from the read-only Factory property provided by Task Using this property, you can call any of the TaskFactory methods There are many forms of StartNew( ) The simplest version is shown here: public Task StartNew(Action action) Here, action is the entry point to the task to be executed StartNew( ) automatically creates a Task instance for action and then starts the task by scheduling it for execution Thus, there is no need to call Start( ) For example, assuming the preceding programs, the following call creates and starts tsk in one step:
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Task tsk = TaskFactoryStartNew(MyTask);
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After this statement executes, MyTask will begin executing Since StartNew( ) is more efficient when a task is going to be created and then immediately started, subsequent examples will use this approach
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Use a Lambda Expression as a Task
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Although there is nothing wrong with using a normal method as a task, there is a second option that is more streamlined You can simply specify a lambda expression as the task Recall that a lambda expression is a form of anonymous function Thus, it can be run as a separate task The lambda expression is especially useful when the only purpose of a method is to be a single-use task The lambda can either constitute the entire task, or it can invoke other methods Either way, the lambda expression approach offers a pleasing alternative to using a named method
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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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The following program demonstrates the use of a lambda expression as a task It converts the MyTask( ) code in preceding programs into a lambda expression
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// Use a lambda expression as a task using System; using SystemThreading; using SystemThreadingTasks; class DemoLambdaTask { static void Main() { ConsoleWriteLine("Main thread starting"); // The following uses a lambda expression to define a task Task tsk = TaskFactoryStartNew( () => { ConsoleWriteLine("Task starting"); for(int count = 0; count < 10; count++) { ThreadSleep(500); ConsoleWriteLine("Task count is " + count ); } ConsoleWriteLine("Task terminating"); } );
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PART II
// Wait until tsk finishes tskWait(); // Dispose of tsk tskDispose(); ConsoleWriteLine("Main thread ending"); } }
The output is shown here:
Main Task Task Task Task Task Task Task Task Task Task Task Task Main thread starting starting count is 0 count is 1 count is 2 count is 3 count is 4 count is 5 count is 6 count is 7 count is 8 count is 9 terminating thread ending
Part II:
Exploring the C# Library
In addition to the use of a lambda expression to describe a task, notice that tskDispose( ) is not called until after tskWait( ) returns As explained in the previous section, Dispose( ) can be called only on a completed task To prove this, try putting the call to tskDispose( ) before the call to tskWait( ) As you will see, an exception is generated
Create a Task Continuation
One innovative, and very convenient, feature of the TPL is its ability to create a task continuation A continuation is a task that automatically begins when another task finishes One way to create a continuation is to use the ContinueWith( ) method defined by Task Its simplest form is shown here: public Task ContinueWith(Action<Task> continuationAction) Here, continuationAction specifies the task that will be run after the invoking task completes This delegate has one parameter of type Task Thus, this is the version of the Action delegate used by the method: public delegate void Action<in T>(T obj) In this case, T is Task The following program demonstrates a task continuation
// Demonstrate a continuation using System; using SystemThreading; using SystemThreadingTasks; class ContinuationDemo { // A method to be run as a task static void MyTask() { ConsoleWriteLine("MyTask() starting"); for(int count = 0; count < 5; count++) { ThreadSleep(500); ConsoleWriteLine("In MyTask() count is " + count ); } ConsoleWriteLine("MyTask terminating"); } // A method to be run as a continuation static void ContTask(Task t) { ConsoleWriteLine("Continuation starting"); for(int count = 0; count < 5; count++) { ThreadSleep(500); ConsoleWriteLine("Continuation count is " + count ); } ConsoleWriteLine("Continuation terminating"); }
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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
static void Main() { ConsoleWriteLine("Main thread starting"); // Construct the first task Task tsk = new Task(MyTask); // Now, create the continuation Task taskCont = tskContinueWith(ContTask); // Begin the task sequence tskStart();
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