/// <summary>
/// Deletes a file or folder placeholder in user file system.
/// </summary>
/// <remarks>This method failes if the file or folder in user file system is modified (not in sync with the remote storage).</remarks>
public async Task DeleteAsync()
{
// Windows does not provide a function to delete a placeholder file only if it is not modified.
// Here we check that the file is not modified in user file system, using GetInSync() call.
// To avoid the file modification between GetInSync() call and Delete() call in this method we
// open it without FileShare.Write flag.
using (WindowsFileSystemItem userFileSystemWinItem = WindowsFileSystemItem.Open(userFileSystemPath, (FileAccess)0, FileMode.Open, FileShare.Read | FileShare.Delete))
{
if (PlaceholderItem.GetInSync(userFileSystemWinItem.SafeHandle))
{
if (FsPath.IsFile(userFileSystemPath))
{
File.Delete(userFileSystemPath);
}
else
{
Directory.Delete(userFileSystemPath, true);
}
}
else
{
throw new IOException("File not in-sync.");
}
}
}
//$>
/// <summary>
/// Deletes a file or folder placeholder in user file system.
/// </summary>
/// <remarks>
/// This method throws <see cref="ConflictException"/> if the file or folder or any file or folder
/// in the folder hierarchy being deleted in user file system is modified (not in sync with the remote storage).
/// </remarks>
/// <returns>True if the file was deleted. False - otherwise.</returns>
public async Task <bool> DeleteAsync()
{
// Cloud Filter API does not provide a function to delete a placeholder file only if it is not modified.
// Here we check that the file is not modified in user file system, using GetInSync() call.
// To avoid the file modification between GetInSync() call and Delete() call we
// open it without FileShare.Write flag.
try
{
// Because of the on-demand population the file or folder placeholder may not exist in the user file system.
if (FsPath.Exists(userFileSystemPath))
{
using (WindowsFileSystemItem userFileSystemWinItem = WindowsFileSystemItem.Open(userFileSystemPath, (FileAccess)0, FileMode.Open, FileShare.Read | FileShare.Delete))
{
if (PlaceholderItem.GetInSync(userFileSystemWinItem.SafeHandle))
{
if (FsPath.IsFile(userFileSystemPath))
{
File.Delete(userFileSystemPath);
}
else
{
Directory.Delete(userFileSystemPath, true);
}
// Delete ETag
ETag.DeleteETag(userFileSystemPath);
return(true);
}
else
{
throw new ConflictException(Modified.Client, "The item is not in-sync with the cloud.");
}
}
}
}
catch (Exception ex)
{
await SetDownloadErrorStateAsync(ex);
// Rethrow the exception preserving stack trace of the original exception.
System.Runtime.ExceptionServices.ExceptionDispatchInfo.Capture(ex).Throw();
}
return(false);
}
