WP8将文件上传到后台的skydrive

Question

我正在开发Windows Phone 8应用程序，它从手机收集联系人并将其存储在xml文件中。 我想在background upload它upload到skydrive 。 我试过这个

IsolatedStorageFileStream fileStream = null;
using (IsolatedStorageFile store = IsolatedStorageFile.GetUserStoreForApplication())
{
    fileStream = store.OpenFile("XMLFile1.xml", FileMode.Open, FileAccess.Read);
    var res = await client.UploadAsync("me/skydrive", "XMLFile1.xml", fileStream, OverwriteOption.Overwrite);
    fileStream.Close();
}

这段代码非常完美。 但是当我按下主页时，上传会停止。 那么即使用户按下screen lock key或home key如何在后台将文件上传到skydrive ？ 并且还想知道如何将文件上传到skydive中的特定文件夹？ 文件或图片等文件夹。 我如何使用client.BackgroundUploadAsync ？ 我怎样才能传递fileStream对象？

Answer 1

您正在使用UploadAsync，并在您离开应用程序时取消。 因为当你点击StartButton时，你正在离开你的应用程序，正如MSDN所说 ：

When the user navigates forward, away from an app, after the Deactivated event is raised, the operating system will attempt to put the app into a dormant state. In this state, all of the application's threads are stopped and no processing takes place, but the application remains intact in memory.

因此，您的应用程序将获取Deactivation事件，并且所有线程和任务都将停止。 如果你留在你的应用程序中，一切都应该可以正常工作（因为它是异步的）。

编辑 - 使用背景传输可以在后台下载

正如您所发现的那样，有一种方法BackgroundUploadAsync ，因为它在那里说：

Begins uploading a file from Windows Phone isolated storage to Microsoft SkyDrive. The file upload should continue even if the app that starts the file upload quits or is suspended.

允许从/到目录shared / transfers /下载/上传文件（仅限此 - 所以在上传之前，必须将文件复制到那里）。 非常简单的代码可能如下所示 - 开始上传异步：

client.BackgroundTransferPreferences = BackgroundTransferPreferences.None; // check policies for this - with this you have to have your phone powered by external source and use WiFi
try
{
   client.BackgroundUploadAsync("me/skydrive", new Uri("shared/transfers/sample.txt", UriKind.Relative), OverwriteOption.Overwrite);
}
catch { }

但是你必须意识到后台传输有自己的策略 - 你应该在发布之前对你的应用程序进行强大的测试。

希望这可以帮助。

Answer 2

使用此OneDriveChunkedUpload.cs上传大文件https://gist.github.com/ificator/3460d7b9d0bff74eb0ff

Answer 3

此PostCompleted事件用于在skydrive中上传文件：

client.PostCompleted +=
                        new EventHandler<LiveOperationCompletedEventArgs>(CreateMyFolder_Completed);
 void CreateMyFolder_Completed(object sender, LiveOperationCompletedEventArgs e)
        {
            if (e.Error == null)
            {
               string folderID = (e.Result["id"]).ToString();
                foreach (string item in names)
                {
                    using (IsolatedStorageFile store = IsolatedStorageFile.GetUserStoreForApplication())
                    {
                        string filename = item;
                        if (store.FileExists(filename))
                        {
                            IsolatedStorageFileStream storeStream = store.OpenFile(filename, FileMode.Open, FileAccess.Read);
                            client.UploadAsync(folderID, filename, storeStream, OverwriteOption.Overwrite);

                        }                         
                    }
                }
            }