public async Task Tasks_FromSync()
{
var ids = new string[] { "iddqd", "idkfq", "abba5", "acdc1" };
var tasks = new List <Task <SensorDto> >();
foreach (var id in ids)
{
var task = Task.Run(() =>
{
var value = SensorData.GetSensorSync(id);
return(value);
});
// var task = Task.Run(() => SensorData.GetSensorSync(id));
tasks.Add(task);
}
var results = await Task.WhenAll(tasks);
// Same with Linq
var tasksLinq = ids.Select(i => Task.Run(() => SensorData.GetSensorSync(i))).ToList();
var resultsLinq = await Task.WhenAll(tasksLinq);
}
public async Task RunAtBackground()
{
var cts = new CancellationTokenSource();
var token = cts.Token;
var collection = new BlockingCollection <string>();
// Explain why task has token and why it is checked in while loop
var backgroundTask = Task.Run(() =>
{
while (token.IsCancellationRequested == false)
{
var sensorToFetch = collection.Take(token);
var sensorData = SensorData.GetSensorSync(sensorToFetch);
// Do something nice with the result
Trace.WriteLine(JsonConvert.SerializeObject(sensorData));
}
}, token);
// Application keeps getting requests from somewhere
while (true)
{
await Task.Delay(5000);
collection.Add(DateTime.Now.Ticks % 2 == 0 ? "abba5" : "iddqd");
}
}
public async Task Tasks_FromSync_Linq()
{
var ids = new string[] { "iddqd", "idkfq", "abba5", "acdc1" };
var tasks = ids.Select(i => Task.Run(() => SensorData.GetSensorSync(i))).ToList();
var results = await Task.WhenAll(tasks);
}
public void RunTask()
{
void BackgroundExecution()
{
while (true)
{
var data = SensorData.GetSensorSync();
Thread.Sleep(1000);
Trace.WriteLine($"In the background: {data.Data}");
}
}
var task = Task.Run(() => BackgroundExecution());
while (task.IsCompleted == false)
{
Thread.Sleep(1000);
}
}
public void RunThread()
{
void BackgroundExecution()
{
while (true)
{
// Do something important
var data = SensorData.GetSensorSync();
Thread.Sleep(1000);
Trace.WriteLine($"In the background: {data.Data}");
}
}
var t = new Thread(new ThreadStart(BackgroundExecution));
t.Start();
while (t.IsAlive)
{
Thread.Sleep(1000);
}
}
public void RunTaskReturn()
{
// Often tasks return something rather than just run "forever" on the background
double BackgroundExecution()
{
var data = SensorData.GetSensorSync();
Thread.Sleep(1000);
return(data.Data);
}
var task = Task.Run(() => BackgroundExecution());
while (task.IsCompleted == false)
{
Thread.Sleep(1000);
}
var result = task.Result;
Assert.Equal(2, result);
}
