如何在后台任务中从Google云端硬盘下载文件 [英] How to download files from Google drive in background task

问题描述

我正在使用这个Windows 8.1商店应用。



我试图在后台使用google-drive-api v3从谷歌驱动器下载文件如果我导航到其他页面，它会被打断。



以下是我正在做的下载文件，但我不知道我需要做什么来制作同样的工作在后台。



有人可以帮助我如何在后台任务中做同样的事情。



谢谢，



我尝试过：

  public   async 任务DownloadFile（DriveService服务，文件文件）
 { 
  var  request = service.Files.Get（file.Id）; 
  var  stream =  new  MemoryStream（）; 
  if （file.MimeType！=   application / vnd.google-apps.folder）
 {
 request.MediaDownloader.ProgressChanged + =（IDownloadProgress progress）= >  
 {
  switch （progress.Status）
 {
  case  DownloadStatus.Downloading：
 {
 Debug.WriteLine（progress.BytesDownloaded）; 
  break ; 
} 
  case  DownloadStatus.Completed：
 {
 Debug.WriteLine（ 下载完成。）; 
  break ; 
} 
  case  DownloadStatus.Failed：
 {
 Debug.WriteLine（ 下载失败。）; 
  break ; 
} 
} 
}; 
 request.Download（stream）; 
  await  SaveToLocalFolderAsync（stream，file.Name）; 
} 
} 

解决方案

您已经有了异步功能，只需添加一个 Task.Run [ ^ ]函数在正文中运行后台任务，只需要将函数代码包装在那里，然后执行它。

  public   void  func（）{ 
 Task.Run（ async （）= >  {
  //  此处有等待代码。 
}）; 
} 

您可能还需要将内部函数更改为异步，只需阅读上面提供的链接，它就有您需要的示例。



我建议您尝试阅读本文，使用异步和等待（C＃）进行异步编程 [ ^ ]。

I am working on this Windows 8.1 store app.

I am trying to download a file from google drive using the google-drive-api v3 in background without it being interrupted if I navigate to some other page.

Below is what I am doing to download a file but I am not sure what I need to do to make the same work in background.

Can someone please help me how I can do this same in background task.

Thanks,

What I have tried:

public  async Task DownloadFile(DriveService service, File file)
        {
            var request = service.Files.Get(file.Id);
            var stream = new MemoryStream();
            if (file.MimeType != "application/vnd.google-apps.folder")
            {
                request.MediaDownloader.ProgressChanged += (IDownloadProgress progress) =>
                {
                    switch (progress.Status)
                    {
                        case DownloadStatus.Downloading:
                            {
                                Debug.WriteLine(progress.BytesDownloaded);
                                break;
                            }
                        case DownloadStatus.Completed:
                            {
                                Debug.WriteLine("Download complete.");
                                break;
                            }
                        case DownloadStatus.Failed:
                            {
                                Debug.WriteLine("Download failed.");
                                break;
                            }
                    }
                };
                request.Download(stream);
                await SaveToLocalFolderAsync(stream, file.Name);
            }
        }

解决方案

You already have an async function, just add a Task.Run[^] function in the body to run the task in the background, that will just require to wrap the function code in there, and execute it.

public void func() {
   Task.Run(async () => {
      // awaitable code here.
   });
}

You might need to change the inner function to async too, just read the link provided above, it has examples for your need.

I recommend that you try to read this, Asynchronous Programming with async and await (C#)[^].

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