BackgroundDownloader一次仅下载5个 [英] BackgroundDownloader only downloading 5 at once

问题描述

我使用BackgroundDownloader.CreateDownload创建1,000个下载，然后通过执行DownloadOperation.Start将其中的100个排队.如果我看着提琴手的流量，实际上只有5个立即发出.当一个完成时，另一个发送出去.

I create 1,000 downloads using BackgroundDownloader.CreateDownload, then I queue up 100 of them by doing DownloadOperation.Start. If I watch the traffic in fiddler, only 5 of them at actually send out at once. When one finishes, another is sent out.

是否可以同时发送更多邮件?

Is there a way to have more sent out concurrently?

推荐答案

是的，在 Windows.Networking.BackgroundTransfer 内一次最多只能下载5次.

Yes, there is a limit of 5 downloads at a time within Windows.Networking.BackgroundTransfer.

如果将所有下载标记为高优先级"，则一次最多可以扩展6个下载，即:

You can extend it to up to 6 downloads at a time if you mark all your downloads as High Priority, i.e.:

var download = backgroundDownloader.CreateDownload(...);
download.Priority = BackgroundTransferPriority.High;
Task<DownloadOperation> task = download.StartAsync(...).AsTask();

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