/// <summary>
/// Performs a search of the default Documents folder. Displays the first page of results.
/// </summary>
/// <returns>A collection of information that describes files and folders.</returns>
internal async Task<List<FileSystemItemViewModel>> GetMyFilesAsync()
{
var fileResults = new List<FileSystemItemViewModel>();
try
{
var graphClient = await AuthenticationHelper.GetGraphServiceClientAsync();
var driveItems = await graphClient.Me.Drive.Root.Children.Request().GetAsync();
foreach (var item in driveItems)
{
FileSystemItemViewModel fileItemModel = new FileSystemItemViewModel();
fileItemModel.Name = item.Name;
fileItemModel.LastModifiedBy = item.LastModifiedBy.User.DisplayName;
fileItemModel.LastModifiedDateTime = item.LastModifiedDateTime.GetValueOrDefault(new DateTime());
fileItemModel.Id = item.Id;
fileItemModel.Folder = item.Folder != null ? item.Folder.ToString() : string.Empty;
fileResults.Add(fileItemModel);
}
}
catch (Exception el)
{
el.ToString();
}
return fileResults.OrderBy(e => e.Name).ToList();
}
/// <summary>
/// Performs a search of the default Documents folder. Displays the first page of results.
/// </summary>
/// <returns>A collection of information that describes files and folders.</returns>
internal async Task<List<FileSystemItemViewModel>> GetMyFilesAsync()
{
var fileResults = new List<FileSystemItemViewModel>();
try
{
var restURL = string.Format("{0}me/drive/root/children", AuthenticationHelper.ResourceBetaUrl);
string responseString = await AuthenticationHelper.GetJsonAsync(restURL);
if (responseString != null)
{
var jsonresult = JObject.Parse(responseString);
foreach (var item in jsonresult["value"])
{
FileSystemItemViewModel fileItemModel = new FileSystemItemViewModel();
fileItemModel.Name = !string.IsNullOrEmpty(item["name"].ToString()) ? item["name"].ToString() : string.Empty;
fileItemModel.LastModifiedBy = !string.IsNullOrEmpty(item["lastModifiedBy"]["user"]["displayName"].ToString()) ? item["lastModifiedBy"]["user"]["displayName"].ToString() : string.Empty;
fileItemModel.LastModifiedDateTime = !string.IsNullOrEmpty(item["lastModifiedDateTime"].ToString()) ? DateTime.Parse(item["lastModifiedDateTime"].ToString()) : new DateTime();
fileItemModel.Id = !string.IsNullOrEmpty(item["id"].ToString()) ? item["id"].ToString() : string.Empty;
fileItemModel.Folder = item["folder"] != null ? item["folder"].ToString() : string.Empty;
fileResults.Add(fileItemModel);
}
}
}
catch (Exception el)
{
el.ToString();
}
return fileResults.OrderBy(e => e.Name).ToList();
}
/// <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.
IItem 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>
/// 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;
}
