public static VersionedXmlLoader Load(FileInfo File)
{
FileStream fs = null;
VersionedXmlLoader vxl = null;
try
{
fs = File.OpenRead();
vxl = Load(fs);
}
catch
{
if (fs != null)
{
fs.Close();
}
}
return(vxl);
}
public static VersionedXmlLoader Load(Stream stream)
{
// Check stream
if (stream == null)
{
throw new ArgumentNullException();
}
if (!stream.CanRead)
{
throw new ArgumentException("Stream can not be read");
}
XmlReader reader = null;
try
{
// Start reading XML
reader = XmlReader.Create(stream);
if (reader.ReadToFollowing("Root") == false)
{
return(null);
}
// Determine the type of the XML file
string name = reader.GetAttribute("Name");
string version = reader.GetAttribute("Version");
// XML file doesn't meet our expected format
if (string.IsNullOrEmpty(name) || string.IsNullOrEmpty(version))
{
return(null);
}
string type = name + "_" + version;
// Load file as known type
stream.Seek(0, SeekOrigin.Begin);
Type dataType = null;
lock (types)
{
if (types.ContainsKey(type))
{
dataType = types[type];
}
}
if (dataType == null)
{
return(null);
}
// Read data
VersionedXmlLoader data = (VersionedXmlLoader)Xml.Compat.Deserialize(dataType, stream, false);
if (data == null)
{
return(null);
}
// Upgrade data if needed
while (data.CanUpgrade)
{
data = data.Upgrade();
}
return(data);
}
catch (Exception) { return(null); }
finally
{
// Close anything left open
if (reader != null)
{
reader.Close();
}
}
}