/// <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);
}
