/// <summary>
/// Downloads the file locally
/// </summary>
/// <param name="file"></param>
/// <returns></returns>
public async Task DownloadFileAsync(OneDriveFile file)
{
// Prepare the picker suggisting the same OneDrive file name
var picker = new FileSavePicker
{
SuggestedFileName = file.Name,
SuggestedStartLocation = PickerLocationId.Downloads,
DefaultFileExtension = Path.GetExtension(file.Name),
};
picker.FileTypeChoices.Add(file.Name, new List <string> {
picker.DefaultFileExtension
});
// Ask where save the file
StorageFile storageFile = await picker.PickSaveFileAsync();
// storageFile is null if the user cancel the pick operation
if (storageFile != null)
{
// Add a new item at the beginning of the list
var item = new OneDriveFileProgress(file);
_progressItems.Insert(0, item);
// Start the download operation
await item.DownloadFileAsync(storageFile, file.DownloadUri);
}
}
/// <summary>
/// Uploads a new file into the folder id specificied
/// </summary>
/// <param name="folderId"></param>
/// <returns></returns>
public async Task UploadFileAsync(string folderId)
{
// Check if session is set
if (AuthenticationService == null)
{
throw new InvalidOperationException($"No {nameof(AuthenticationService)} has been specified");
}
// Open the picker for file selection
var picker = new FileOpenPicker
{
SuggestedStartLocation = PickerLocationId.Downloads,
};
// User can select any file
picker.FileTypeFilter.Add("*");
StorageFile storageFile = await picker.PickSingleFileAsync();
// storageFile is null if no file has been selected
if (storageFile != null)
{
// Create the graph request builder for the drive
IDriveRequestBuilder driveRequest = AuthenticationService.GraphClient.Me.Drive;
// If folder id is null, the request refers to the root folder
IDriveItemRequestBuilder driveItemsRequest;
if (folderId == null)
{
driveItemsRequest = driveRequest.Root;
}
else
{
driveItemsRequest = driveRequest.Items[folderId];
}
try
{
// Create an upload session for a file with the same name of the user selected file
UploadSession session = await driveItemsRequest
.ItemWithPath(storageFile.Name)
.CreateUploadSession()
.Request()
.PostAsync();
// Add a new upload item at the beginning
var item = new OneDriveFileProgress(storageFile.Name);
_progressItems.Insert(0, item);
// Start the upload process
await item.UploadFileAsync(AuthenticationService, storageFile, session);
}
catch (Exception ex)
{
Error?.Invoke(this, ex);
}
}
}
