public static async Task <long> BigSum()
{
List <Task <long> > tasks = new List <Task <long> >();
foreach (var unused in Enumerable.Range(0, 5))
{
tasks.Add(CompletedTask.Get().CalcSomething());
}
try
{
var ret = await Task.WhenAll(tasks);
return(ret.Sum());
}
catch (Exception e)
{
//If any task throws, WhenAll faults with the Exception here
//There is no need to check exceptions from other tasks; first is enough
Console.WriteLine(e);
throw;
}
}