Task in .NET C#

Task in .NET C#

New threads can be started using the Task Programming Library in .NET in – at last – 5 different ways.

You’ll first need to add the following using statement:

using System.Threading.Tasks;

1.      The most direct way

Task.Factory.StartNew(() => Console.WriteLine("Task library Sample!"));

2.      Using Action

Task task = new Task(new Action(PrintMessage)); task.Start();

…where PrintMessage is a method:

private static void PrintMessage() {  Console.WriteLine("Hello Task library!"); }

3.      Using a delegate

Task task = new Task(delegate { PrintMessage(); }); task.Start();

4.      Lambda and named method

Task task = new Task(() => PrintMessage()); task.Start();

5.      Lambda and anonymous method

Task task = new Task(() => { PrintMessage(); }); task.Start();

6.      Using Task.Run in .NET4.5

public async Task DoWork() {     await Task.Run(() => PrintMessage()); }

7.      Using Task.FromResult in .NET4.5 to return a result from a Task

public async Task DoWork() {     int res = await Task.FromResult<int>(GetSum(4, 5));   } private int GetSum(int a, int b) {     return a + b; }

You cannot start a task that has already completed. If you need to run the same task you’ll need to initialise it again.

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