private async static Task MassiveAsyncDownloads()
{
List <Task> tasks = new List <Task>(); //all of the ongoing tasks
ImageDownloader downloader = new ImageDownloader("lotsoffiles");
Stopwatch sw = new Stopwatch();
sw.Start();
int i = 0;
while (i < 100)
{
Console.WriteLine($"Downloading image {i}");
tasks.Add(downloader.DownloadRandomPhotoAsync(i));
i++;
}
Task.WaitAll(tasks.ToArray()); //wait for all tasks to complete before proceeding forward
sw.Stop();
Console.WriteLine($"Downloaded {i} images in {sw.ElapsedMilliseconds}ms");
}
/// <summary>
/// We'll use the stopwatch to track how long this method takes to complete.
/// </summary>
private static void SyncDownloads()
{
Stopwatch sw = new Stopwatch();
sw.Start();
ImageDownloader downloader = new ImageDownloader("sync");
int i = 0;
i++;
Console.WriteLine($"Downloading image {i}");
downloader.DownloadRandomPhoto();
i++;
Console.WriteLine($"Downloading image {i}");
downloader.DownloadRandomPhoto();
i++;
Console.WriteLine($"Downloading image {i}");
downloader.DownloadRandomPhoto();
i++;
Console.WriteLine($"Downloading image {i}");
downloader.DownloadRandomPhoto();
i++;
Console.WriteLine($"Downloading image {i}");
downloader.DownloadRandomPhoto();
i++;
Console.WriteLine($"Downloading image {i}");
downloader.DownloadRandomPhoto();
i++;
Console.WriteLine($"Downloading image {i}");
downloader.DownloadRandomPhoto();
i++;
Console.WriteLine($"Downloading image {i}");
downloader.DownloadRandomPhoto();
i++;
Console.WriteLine($"Downloading image {i}");
downloader.DownloadRandomPhoto();
i++;
Console.WriteLine($"Downloading image {i}");
downloader.DownloadRandomPhoto();
i++;
Console.WriteLine($"Downloading image {i}");
downloader.DownloadRandomPhoto();
i++;
Console.WriteLine($"Downloading image {i}");
downloader.DownloadRandomPhoto();
i++;
Console.WriteLine($"Downloading image {i}");
downloader.DownloadRandomPhoto();
sw.Stop();
Console.WriteLine($"Downloaded {i} images in {sw.ElapsedMilliseconds}ms");
}
/// <summary>
/// We'll send the requests asynchronously but measure the time it takes on the stopwatch for all of them to complete.
/// </summary>
/// <returns>Task - so that our void main can wait for it to complete.</returns>
private async static Task AsyncDownloads()
{
Stopwatch sw = new Stopwatch();
sw.Start();
ImageDownloader downloader = new ImageDownloader("async");
int i = 0;
i++;
Console.WriteLine($"Downloading image {i}");
var task1 = downloader.DownloadRandomPhotoAsync(i);
i++;
Console.WriteLine($"Downloading image {i}");
var task2 = downloader.DownloadRandomPhotoAsync(i);
i++;
Console.WriteLine($"Downloading image {i}");
var task3 = downloader.DownloadRandomPhotoAsync(i);
i++;
Console.WriteLine($"Downloading image {i}");
var task4 = downloader.DownloadRandomPhotoAsync(i);
i++;
Console.WriteLine($"Downloading image {i}");
var task5 = downloader.DownloadRandomPhotoAsync(i);
i++;
Console.WriteLine($"Downloading image {i}");
var task6 = downloader.DownloadRandomPhotoAsync(i);
i++;
Console.WriteLine($"Downloading image {i}");
var task7 = downloader.DownloadRandomPhotoAsync(i);
i++;
Console.WriteLine($"Downloading image {i}");
var task8 = downloader.DownloadRandomPhotoAsync(i);
i++;
Console.WriteLine($"Downloading image {i}");
var task9 = downloader.DownloadRandomPhotoAsync(i);
i++;
Console.WriteLine($"Downloading image {i}");
var task10 = downloader.DownloadRandomPhotoAsync(i);
i++;
Console.WriteLine($"Downloading image {i}");
var task11 = downloader.DownloadRandomPhotoAsync(i);
i++;
Console.WriteLine($"Downloading image {i}");
var task12 = downloader.DownloadRandomPhotoAsync(i);
i++;
Console.WriteLine($"Downloading image {i}");
var task13 = downloader.DownloadRandomPhotoAsync(i);
await task1;
await task2;
await task3;
await task4;
await task5;
await task6;
await task7;
await task8;
await task9;
await task10;
await task11;
await task12;
await task13;
sw.Stop();
Console.WriteLine($"Downloaded {i} images in {sw.ElapsedMilliseconds}ms");
}