/// <exception cref="FileLockedException"></exception>
protected XmlFileManager(string path, string rootTag, bool readOnly)
{
if (string.IsNullOrEmpty(path))
{
throw new ArgumentNullException("path");
}
if (string.IsNullOrEmpty(rootTag))
{
throw new ArgumentNullException("rootTag");
}
FilePath = path;
// make sure the folder exists
string folder = Path.GetDirectoryName(FilePath);
if (!Directory.Exists(folder))
{
Directory.CreateDirectory(folder);
}
// open/create the file
try
{
_file = File.Open(FilePath, FileMode.OpenOrCreate,
readOnly ? FileAccess.Read : FileAccess.ReadWrite,
readOnly ? FileShare.ReadWrite : FileShare.Read);
}
catch (IOException e)
{
throw new FileLockedException(FilePath, e);
}
// parse it
var document = new XDocument();
try
{
using (var fileLock = new FileLock(_file))
{
if (_file.Length > 0)
{
document = XDocument.Load(_file);
}
else // initialize the XML document with the root element
{
document = new XDocument(new XElement(rootTag));
}
}
}
catch (FileLockedException)
{
Dispose();
throw;
}
catch (Exception e)
{
Dispose();
throw new InvalidDataException(string.Format("{0} is corrupt.", PathHelper.Quote(FilePath)), e);
}
RootElement = document.Root;
if (readOnly)
{
Dispose();
}
}