protected virtual DataSet LoadFromFile()
{
if (m_FileName == null)
{
throw new ApplicationException("FileName is null");
}
System.Xml.XmlDocument xmlDoc = new System.Xml.XmlDocument();
xmlDoc.Load(m_FileName);
System.Xml.XmlNamespaceManager namespaceMan = new System.Xml.XmlNamespaceManager(xmlDoc.NameTable);
namespaceMan.AddNamespace("fileds", c_DataNamespace);
System.Xml.XmlNode tmp = xmlDoc.DocumentElement.SelectSingleNode("fileds:header", namespaceMan);
if (tmp == null)
{
throw new ApplicationException("File header not found");
}
System.Xml.XmlElement header = (System.Xml.XmlElement)tmp;
//File Version
string strFileVersion = header.GetAttribute(c_FileVersion);
int fileVersion = int.Parse(strFileVersion);
if (fileVersion == c_FileVersionNumber)
{
string strDataFormat = header.GetAttribute(c_DataFormat);
mFileDataFormat = (StreamDataSetFormat)int.Parse(strDataFormat);
}
else if (fileVersion == 0)
{
mFileDataFormat = StreamDataSetFormat.XML;
}
else if (fileVersion > c_FileVersionNumber)
{
throw new ApplicationException("File Version not supported, expected: " + c_FileVersionNumber.ToString());
}
//Data Version
string strDataVersion = header.GetAttribute(c_DataVersion);
int dataVersion = int.Parse(strDataVersion);
DataSet dataSet = CreateData(dataVersion);
//Data
tmp = xmlDoc.DocumentElement.SelectSingleNode("fileds:data", namespaceMan);
if (tmp == null)
{
throw new ApplicationException("File data not found");
}
System.Xml.XmlElement xmlDataNode = (System.Xml.XmlElement)tmp;
byte[] xmlBuffer = System.Convert.FromBase64String(xmlDataNode.InnerText);
using (System.IO.MemoryStream memStream = new System.IO.MemoryStream(xmlBuffer))
{
StreamDataSet.Read(memStream, dataSet, mFileDataFormat, MergeReadedSchema);
//dataSet.ReadXml(memStream);
}
return(dataSet);
}
protected virtual void SaveToFile(DataSet pDataSet)
{
if (m_FileName == null)
{
throw new ApplicationException("FileName is null");
}
byte[] completeByteArray;
using (System.IO.MemoryStream fileMemStream = new System.IO.MemoryStream())
{
System.Xml.XmlTextWriter xmlWriter = new System.Xml.XmlTextWriter(fileMemStream, System.Text.Encoding.UTF8);
xmlWriter.WriteStartDocument();
xmlWriter.WriteStartElement("filedataset", c_DataNamespace);
xmlWriter.WriteStartElement("header", c_DataNamespace);
//File Version
xmlWriter.WriteAttributeString(c_FileVersion, c_FileVersionNumber.ToString());
//Data Version
xmlWriter.WriteAttributeString(c_DataVersion, GetDataVersion().ToString());
//Data Format
xmlWriter.WriteAttributeString(c_DataFormat, ((int)mSaveDataFormat).ToString());
xmlWriter.WriteEndElement();
xmlWriter.WriteStartElement("data", c_DataNamespace);
byte[] xmlByteArray;
using (System.IO.MemoryStream xmlMemStream = new System.IO.MemoryStream())
{
StreamDataSet.Write(xmlMemStream, pDataSet, mSaveDataFormat);
//pDataSet.WriteXml(xmlMemStream);
xmlByteArray = xmlMemStream.ToArray();
xmlMemStream.Close();
}
xmlWriter.WriteBase64(xmlByteArray, 0, xmlByteArray.Length);
xmlWriter.WriteEndElement();
xmlWriter.WriteEndElement();
xmlWriter.WriteEndDocument();
xmlWriter.Flush();
completeByteArray = fileMemStream.ToArray();
fileMemStream.Close();
}
//se tutto ?andato a buon fine scrivo effettivamente il file
using (System.IO.FileStream fileStream = new System.IO.FileStream(m_FileName, System.IO.FileMode.Create, System.IO.FileAccess.Write))
{
fileStream.Write(completeByteArray, 0, completeByteArray.Length);
fileStream.Close();
}
}
