我做错了什么async/await

我正在为我创建一个基本上可以玩游戏的应用程序。它组织突袭，加入突袭，然后发动突袭。我正在尝试异步地完成这些。

一些背景:FormRaidAsync, JoinRaidAsync和LaunchRaidAsync都做web请求。方法本身也设置为异步的，但是当我运行程序时，它只加入大约2-3个帐户/秒。

我做错了什么，或者async/await不一定在一个新线程上运行每个请求?如果是这种情况，我如何调整这段代码以接近10/秒的速率加入帐户?我是否必须使用其他形式的多线程来一次发出更多请求?

谢谢每一个人。如果需要更多的细节，请告诉我。

public async Task<string> StartRaidAsync()
{
    string raid_id = String.Empty;
    try
    {
        raid_id = await this.Helper.FormRaidAsync(this.TargetRaid.Id, this.Former.Id, this.TargetRaid.IsBossRaid).ConfigureAwait(false);
        Console.WriteLine("Formed raid with {0}.", this.Former.Name);
        List<Task> joinTasks = new List<Task>();
        foreach (var joiner in this.Joiners)
        {
            try
            {
                joinTasks.Add(this.Helper.JoinRaidAsync(raid_id, joiner.Id));
            }
            catch (Exception)   // Not sure which exceptions to catch yet.
            {
                Console.WriteLine("Error joining {0}. Skipped.", joiner.Name);
            }
        }
        Task.WaitAll(joinTasks.ToArray());
        await this.Helper.LaunchRaidAsync(raid_id, this.Former.Id).ConfigureAwait(false);
        Console.WriteLine("{0} launched raid.", this.Former.Name);
    }
    catch (Exception)   // Not sure which exceptions to catch yet.
    {
        return "ERROR";
    }
    return raid_id;
}

在JoinRaidAsync

:

public async Task JoinRaidAsync(string raid_id, string suid)
{
    var postUrl = "some url";
    var postData = "some data";
    await this.Socket.PostAsync(postUrl, postData).ConfigureAwait(false);
    Console.WriteLine("Joined {0}.", suid);
}

里面的插座。PostAsync:

public async Task<string> PostAsync(string url, string postData)
{
    return await SendRequestAsync(url, postData).ConfigureAwait(false);
}

在SendRequestAsync

:

protected virtual async Task<string> SendRequestAsync(string url, string postData)
{
    for (int i = 0; i < 3; i++)
    {
        try
        {
            HttpWebRequest request = this.CreateRequest(url);
            if (!String.IsNullOrWhiteSpace(postData))
            {
                request.Method = "POST";
                request.ContentType = "application/x-www-form-urlencoded";
                request.ContentLength = postData.Length;
                var stream = await request.GetRequestStreamAsync().ConfigureAwait(false);
                using (StreamWriter writer = new StreamWriter(stream))
                {
                    await writer.WriteAsync(postData).ConfigureAwait(false);
                    await writer.FlushAsync().ConfigureAwait(false);
                }
            }
            using (HttpWebResponse response = (HttpWebResponse)(await request.GetResponseAsync().ConfigureAwait(false)))
            {
                string responseString = String.Empty;
                using (StreamReader reader = new StreamReader(response.GetResponseStream()))
                {
                    responseString = await reader.ReadToEndAsync().ConfigureAwait(false);
                }
                return responseString;
            }
        }
        catch (Exception e)
        {
            Console.WriteLine(e.Message);
        }
    }
    return String.Empty;
}

Task.WaitAll(joinTasks.ToArray());

await Task.WhenAll(joinTasks.ToArray());