/// <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> //Creates a new file named demo.txt in the default document library. //</summary> //<returns>A Boolean value that indicates whether the new text file was successfully created.</returns> internal async Task <String> CreateNewTextFileAsync() { //bool isSuccess = false; String newID = string.Empty; var sharePointClient = await AuthenticationHelper.EnsureSharePointClientCreatedAsync("MyFiles"); try { // First check whether demo.txt already exists. If it exists, delete it. // If it doesn't exist, swallow the error. IItem item = await sharePointClient.Files.GetByPathAsync("demo.txt"); await item.DeleteAsync(); } catch (ODataErrorException) { // fail silently because demo.txt doesn't exist. } try { // In this example, we'll create a simple text file and write the current timestamp into it. string createdTime = "Created at " + DateTime.Now.ToLocalTime().ToString(); byte[] bytes = Encoding.UTF8.GetBytes(createdTime); using (MemoryStream stream = new MemoryStream(bytes)) { // File is called demo.txt. If it already exists, we'll get an exception. Microsoft.Office365.SharePoint.FileServices.File newFile = new Microsoft.Office365.SharePoint.FileServices.File { Name = "demo.txt" }; // Create the empty file. await sharePointClient.Files.AddItemAsync(newFile); newID = newFile.Id; // Upload the file contents. await sharePointClient.Files.GetById(newFile.Id).ToFile().UploadAsync(stream); } } // ODataErrorException can be thrown when you try to create a file that already exists. catch (Microsoft.Data.OData.ODataErrorException) { //isSuccess = false; } return(newID); }