using System.Runtime.CompilerServices;
using System.Threading.Tasks;

// Example 4: await IEnumerable<Task<T>>

// Just a dummy async function
public static Task<string> GetSomethingAsync(int number) => Task.FromResult($"Something {number}");

// This extension method allows us to await many tasks
public static TaskAwaiter<T[]> GetAwaiter<T>(this IEnumerable<Task<T>> manyTasks)
=> Task.WhenAll(manyTasks).GetAwaiter();

// this line will now compile and run
var manyThings = await Enumerable.Range(0, 10).Select(GetSomethingAsync);

// Just to prove it, output all the things
foreach(var thing in manyThings)
{
  Console.WriteLine(thing);
}