我对async/await做错了什么？

Question

我正在努力创建一个基本上为我玩游戏的应用程序.它形成突袭,加入突袭,然后启动突袭.我试图异步完成这一切.

一些背景:FormRaidAsync,JoinRaidAsync和LaunchRaidAsync都会发出Web请求.方法本身也设置为异步,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async/await不一定在新线程上运行每个请求？如果是这种情况,我如何调整此代码以接近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同时发出更多请求？

感谢大家.如果需要更多细节,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中:

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);
}

在Socket.PostAsync中:

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

在SendRequestAsync内:

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;
}

Answer 1

我做错了什么,或async/await不一定在新线程上运行每个请求？

async/ await不会创建新线程.

如果是这种情况,我如何调整此代码以接近10 /秒的速率加入帐户？

异步代码可以一次执行多个请求.当然,这些请求的速度取决于Web服务调用的速度.

我现在在代码中唯一看错的是混合阻塞和异步代码.更换:

Task.WaitAll(joinTasks.ToArray());

有:

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

如果您仍然遇到问题,可能是由于您的Web服务或其他支持代码(例如代码中的代码JoinRaidAsync).