C# OneDrive上载/下载到指定目录

我正在尝试使用Live SDK（v5.6）在我的Windows Phone 8.1 Silverlight应用程序中包括从OneDrive进行备份/恢复。我可以读/写标准的“me/skydrive”目录，但在找到上传/下载到指定目录的方法时，我经历了一段可怕的时光。我可以创建文件夹，如果它不存在没有问题

我一直在尝试下面没有运气

var res = await _client.UploadAsync("me/skydrive/mydir", fileName, isoStoreFileStream, OverwriteOption.Overwrite);

我还尝试获取目录ID并将其传递给其他人

var res = await _client.UploadAsync("me/skydrive/" + folderId, fileName, isoStoreFileStream, OverwriteOption.Overwrite);

同样的错误。。我收到“mydir”或该id不受支持

{请求\ url\无效：Microsoft.Live.LiveConnectException:url包含不受支持的路径“mydir”

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有什么建议吗？如果您建议uploadasync的答案，您还可以包括我如何从指定目录下载我的文件吗？谢谢！

这里有一个扩展方法，用于检查是否创建了文件夹，以及：

如果已创建，则返回文件夹id

如果未创建，则创建它并返回文件夹id

然后，您可以使用此id上载到该文件夹并从中下载

public async static Task<string> CreateDirectoryAsync(this LiveConnectClient client,
string folderName, string parentFolder)
    {
        string folderId = null;

        // Retrieves all the directories.
        var queryFolder = parentFolder + "/files?filter=folders,albums";
        var opResult = await client.GetAsync(queryFolder);
        dynamic result = opResult.Result;

        foreach (dynamic folder in result.data)
        {
            // Checks if current folder has the passed name.
            if (folder.name.ToLowerInvariant() == folderName.ToLowerInvariant())
            {
                folderId = folder.id;
                break;
            }
        }

        if (folderId == null)
        {
            // Directory hasn't been found, so creates it using the PostAsync method.
            var folderData = new Dictionary<string, object>();
            folderData.Add("name", folderName);
            opResult = await client.PostAsync(parentFolder, folderData);
            result = opResult.Result;

            // Retrieves the id of the created folder.
            folderId = result.id;
        }

        return folderId;
    }

通过YnotDraw添加以完成答案

使用您提供的内容，以下是如何通过指定文件名下载文本文件。下面不包括文件是否未找到以及其他潜在的异常，但以下是星形正确对齐时的工作方式：

public async static Task<string> DownloadFileAsync(this LiveConnectClient client, string directory, string fileName)
    {
        string skyDriveFolder = await OneDriveHelper.CreateOrGetDirectoryAsync(client, directory, "me/skydrive");
        var result = await client.DownloadAsync(skyDriveFolder);

        var operation = await client.GetAsync(skyDriveFolder + "/files");

        var items = operation.Result["data"] as List<object>;
        string id = string.Empty;

        // Search for the file - add handling here if File Not Found
        foreach (object item in items)
        {
            IDictionary<string, object> file = item as IDictionary<string, object>;
            if (file["name"].ToString() == fileName)
            {
                id = file["id"].ToString();
                break;
            }
        }

        var downloadResult= await client.DownloadAsync(string.Format("{0}/content", id));

        var reader = new StreamReader(downloadResult.Stream);
        string text = await reader.ReadToEndAsync();
        return text;
    }

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感谢您发布代码。我看到错误“Microsoft.Live.LiveConnectClient”不包含“DownloadAsync”的定义。有人能告诉我为什么我会看到错误吗？@ezaspi您使用的是最新版本的Live SDK吗？您针对的是哪个平台？Live SDK 5.6.Windows Phone 8.1.是8.1 Silverlight还是WinRT？Personally我还没有在8.1上测试，但是如果没有DownloadAsync，它应该有一个不同的名称。WinRT。我让它工作了。我安装了5.6，但DownloadAsync不可用。所以我使用了CreateBackgroundDownloadAsync。

LiveOperationResult result = await liveConnectClient.UploadAsync(skyDriveFolder, fileName,
                                                  fileStream, OverwriteOption.Overwrite);

public async static Task<string> DownloadFileAsync(this LiveConnectClient client, string directory, string fileName)
    {
        string skyDriveFolder = await OneDriveHelper.CreateOrGetDirectoryAsync(client, directory, "me/skydrive");
        var result = await client.DownloadAsync(skyDriveFolder);

        var operation = await client.GetAsync(skyDriveFolder + "/files");

        var items = operation.Result["data"] as List<object>;
        string id = string.Empty;

        // Search for the file - add handling here if File Not Found
        foreach (object item in items)
        {
            IDictionary<string, object> file = item as IDictionary<string, object>;
            if (file["name"].ToString() == fileName)
            {
                id = file["id"].ToString();
                break;
            }
        }

        var downloadResult= await client.DownloadAsync(string.Format("{0}/content", id));

        var reader = new StreamReader(downloadResult.Stream);
        string text = await reader.ReadToEndAsync();
        return text;
    }

var result = await DownloadFile(_client, "MyDir", "backup.txt");