public static async Task AccessTheWebAsync(CancellationToken ct)
{
HttpClient client = new HttpClient();
// Make a list of web addresses.
List <string> urlList = SetUpURLList();
// ***Create a query that, when executed, returns a collection of tasks.
IEnumerable <Task <RoleSkills> > downloadTasksQuery =
from url in urlList select ProcessURL(url, client, ct);
// ***Use ToList to execute the query and start the tasks.
List <Task <RoleSkills> > downloadTasks = downloadTasksQuery.ToList();
// ***Add a loop to process the tasks one at a time until none remain.
while (downloadTasks.Count > 0)
{
// Identify the first task that completes.
Task <RoleSkills> firstFinishedTask = await Task.WhenAny(downloadTasks);
// ***Remove the selected task from the list so that you don't
// process it more than once.
downloadTasks.Remove(firstFinishedTask);
// Await the completed task.
RoleSkills content = await firstFinishedTask;
Console.WriteLine("Role: {0}", content.Role);
Console.WriteLine("Skills: {0}\n\n", String.Join(",", content.Skills));
}
}
private static async Task <RoleSkills> ProcessURL(string url, HttpClient client, CancellationToken ct)
{
// GetAsync returns a Task<HttpResponseMessage>.
HttpResponseMessage response = await client.GetAsync(url, ct);
// Retrieve the website contents from the HttpResponseMessage.
RoleSkills roleSkills = await response.Content.ReadAsAsync <RoleSkills>();
return(roleSkills);
}
