Run async method 8 times in parallel

Question

How do I turn the following into a Parallel.ForEach?

public async void getThreadContents(String[] threads)
{
    HttpClient client = new HttpClient();
    Li         


        

Answer 1

You can try the ParallelForEachAsync extension method from AsyncEnumerator NuGet Package:

using System.Collections.Async;

public async void getThreadContents(String[] threads)
{
    HttpClient client = new HttpClient();
    List usernames = new List();
    int i = 0;

    await threads.ParallelForEachAsync(async url =>
    {
        i++;
        progressLabel.Text = "Scanning thread " + i.ToString() + "/" + threads.Count();
        HttpResponseMessage response = await client.GetAsync(url);
        String content = await response.Content.ReadAsStringAsync();
        String user;
        Predicate userPredicate;
        foreach (Match match in regex.Matches(content))
        {
            user = match.Groups[1].ToString();
            userPredicate = (String x) => x == user;
            if (usernames.Find(userPredicate) != user)
            {
                usernames.Add(match.Groups[1].ToString());
            }
        }

        // THIS CALL MUST BE THREAD-SAFE!
        progressBar1.PerformStep();
    },
    maxDegreeOfParallelism: 8);
}