private async Task LoadFilesAndFoldersAsync()
{
LoggingViewModel.Instance.Information = "Retrieving items ...";
this.LoadingFilesAndFolders = true;
DirectoryItems.Clear();
IEnumerable <IItem> files = await _fileOperations.GetMyFilesAsync();
if (files != null)
{
foreach (IItem file in files)
{
FileSystemItemViewModel _directoryItem = new FileSystemItemViewModel(file);
//Adding FileSystemItems to observable collection.
DirectoryItems.Add(_directoryItem);
}
LoggingViewModel.Instance.Information = string.Empty;
}
else
{
LoggingViewModel.Instance.Information = "We couldn't get your file and folder list.";
}
this.LoadingFilesAndFolders = false;
}
/// <summary>
/// Deletes the selected item or folder from the ListBox.
/// </summary>
/// <returns>A Boolean value that indicates whether the file or folder was successfully deleted.</returns>
internal async Task<bool?> DeleteFileOrFolderAsync(FileSystemItemViewModel _selectedFileObject)
{
bool? isSuccess = false;
try
{
// Gets the FileSystemItem that is selected in the bound ListBox control.
IFileSystemItem fileOrFolderToDelete = _selectedFileObject.FileSystemItem;
// This results in a call to the service.
await fileOrFolderToDelete.DeleteAsync();
isSuccess = true;
}
catch (Microsoft.Data.OData.ODataErrorException)
{
isSuccess = null;
}
catch (NullReferenceException)
{
isSuccess = null;
}
return isSuccess;
}
/// <summary>
/// Command for getting the file and folder list.
/// </summary>
async void ExecuteGetFileAndFolderListCommandAsync()
{
DirectoryItems.Clear();
IEnumerable <IFileSystemItem> files = await _fileOperations.GetMyFilesAsync();
if (files != null)
{
foreach (IFileSystemItem file in files)
{
FileSystemItemViewModel _directoryItem = new FileSystemItemViewModel(file);
//Adding FileSystemItems to observable collection.
DirectoryItems.Add(_directoryItem);
}
}
else
{
LoggingViewModel.Instance.Information = "We couldn't get your file and folder list.";
}
}
/// <summary>
/// Downloads a file selected in the ListBox control.
/// </summary>
/// <param name="_selectedFileObject">The file selected in the ListBox.</param>
/// <returns>A Stream of the downloaded file.</returns>
internal async Task<Stream> DownloadFileAsync(FileSystemItemViewModel _selectedFileObject)
{
File file;
Stream stream = null;
try
{
// Get a handle on the selected item.
IItem myFile = _selectedFileObject.FileSystemItem;
file = myFile as File;
// Download the file from the service. This results in call to the service.
stream = await file.DownloadAsync();
}
catch (NullReferenceException)
{
// Silently fail. A null stream will be handled higher up the stack.
}
return stream;
}
/// <summary>
/// Update the currently selected item by appending new text.
/// </summary>
/// <param name="_selectedFileObject">The file selected in the ListBox.</param>
/// <param name="fileText">The updated text contents of the file.</param>
/// <returns>A Boolean value that indicates whether the text file was successfully updated.</returns>
internal async Task<bool> UpdateTextFileAsync(FileSystemItemViewModel _selectedFileObject, string fileText)
{
File file;
byte[] byteArray;
bool isSuccess = false;
try
{
// Get a handle on the selected item.
IItem myFile = _selectedFileObject.FileSystemItem;
file = myFile as File;
string updateTime = "\n\r\n\rLast update at " + DateTime.Now.ToLocalTime().ToString();
byteArray = Encoding.UTF8.GetBytes(fileText + updateTime);
using (MemoryStream stream = new MemoryStream(byteArray))
{
// Update the file. This results in a call to the service.
await file.UploadAsync(stream);
isSuccess = true; // We've updated the file.
}
}
catch (ArgumentException)
{
isSuccess = false;
}
return isSuccess;
}
/// <summary>
/// Reads the contents of a text file and displays the results in a TextBox.
/// </summary>
/// <param name="_selectedFileObject">The file selected in the ListBox.</param>
/// <returns>A Boolean value that indicates whether the text file was successfully read.</returns>
internal async Task<object[]> ReadTextFileAsync(FileSystemItemViewModel _selectedFileObject)
{
string fileContents = string.Empty;
object[] results = new object[] { fileContents, false };
try
{
// Get a handle on the selected item.
IItem myFile = _selectedFileObject.FileSystemItem;
// Check that the selected item is a text-based file.
if (!myFile.Name.EndsWith(".txt") && !myFile.Name.EndsWith(".xml"))
{
results[0] = string.Empty;
results[1] = false;
return results;
}
File file = myFile as File;
// Download the file contents as a string. This results in a call to the service.
using (Stream stream = await file.DownloadAsync())
{
using (StreamReader reader = new StreamReader(stream))
{
results[0] = await reader.ReadToEndAsync();
results[1] = true;
}
}
}
catch (NullReferenceException)
{
results[1] = false;
}
catch (ArgumentException)
{
results[1] = false;
}
return results;
}
private async Task LoadFilesAndFoldersAsync()
{
LoggingViewModel.Instance.Information = "Retrieving items ...";
this.LoadingFilesAndFolders = true;
DirectoryItems.Clear();
IEnumerable<IItem> files = await _fileOperations.GetMyFilesAsync();
if (files != null)
{
foreach (IItem file in files)
{
FileSystemItemViewModel _directoryItem = new FileSystemItemViewModel(file);
//Adding FileSystemItems to observable collection.
DirectoryItems.Add(_directoryItem);
}
LoggingViewModel.Instance.Information = string.Empty;
}
else
{
LoggingViewModel.Instance.Information = "We couldn't get your file and folder list.";
}
this.LoadingFilesAndFolders = false;
}
/// <summary>
/// Command for getting the file and folder list.
/// </summary>
async void ExecuteGetFileAndFolderListCommandAsync()
{
DirectoryItems.Clear();
IEnumerable<IFileSystemItem> files = await _fileOperations.GetMyFilesAsync();
if (files != null)
{
foreach (IFileSystemItem file in files)
{
FileSystemItemViewModel _directoryItem = new FileSystemItemViewModel(file);
//Adding FileSystemItems to observable collection.
DirectoryItems.Add(_directoryItem);
}
}
else
{
LoggingViewModel.Instance.Information = "We couldn't get your file and folder list.";
}
}