c# – OneDrive上传/下载到指定目录

>如果创建,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上传到该文件夹??并从该文件夹下载.

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;
    }

然后你用它作为：

string skyDriveFolder = await CreateDirectoryAsync(liveConnectClient,"<YourFolderNameHere>","me/skydrive");

现在,skyDriveFolder具有上传和下载时可以使用的文件夹ID.这是一个示例上传：

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

添加以完成YnotDraw的回答

使用您提供的内容,以下是如何通过指定文件名来下载文本文件.下面不包括是否找不到文件和其他潜在的例外情况,但这里有什么在星星正确对齐时有效：

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;
    }

在使用中：

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