Threading Examples
The example below runs in LinqPad but has not been tested in VS or VSCode.
The demonstration shows that tasks are started immediately, added to a list and then execution is paused until one, and later all, tasks have completed.
async Task Main()
{
Debug.WriteLine("starting");
var taskList = new List<Task>();
// first task is created...
var t = TestTask.DoSomething("first", 100);
taskList.Add(t);
// line below demonstrates that first task starts immediately.
// because will see results for 500ms before the next task starts
await Task.Delay(500);
// now add a second task, which will also start immediately
var t1 = TestTask.DoSomething("\t\t\t SECOND", 500);
taskList.Add(t1);
// and add a third task, also to start immediately
var t2 = TestTask.DoSomething("\t\t\t\t\t\t\t\t\t\t\t\t third", 1000);
taskList.Add(t2);
// we don't have to create an intermediate variable, great for loops....
taskList.Add(TestTask.DoSomething("\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t fourth", 300));
await Task.WhenAny(taskList);
// the equivalent to above but not creating a task
// Task.WaitAny(taskList.ToArray());
Debug.WriteLine("somebody is done - not sure which");
await Task.WhenAll(taskList);
// the equivalent to above but not creating a task
// Task.WaitAll(taskList.ToArray());
// the line below should appear when all tasks are finished.
Debug.WriteLine("\n\n________________ all finished ______________");
}
public static class TestTask
{
public static async Task DoSomething(string name, int delay)
{
for (int i = 0; i < 10; i++)
{
Debug.WriteLine($"{name}:{i}");
await Task.Delay(delay);
}
}
}
// Define other methods and classes here