Convert Dataset to XML

I've been stuck with this problem for a few hours and can't seem to figure it out, so I'm asking here :)

Alright, I've got this function:

private void XmlDump()
{
    XDocument doc = new XDocument(new XDeclaration("1.0", "utf-8", "yes"));
    XElement rootElement = new XElement("dump");
    rootElement.Add(TableToX("Support"));

    string connectionString = ConfigurationManager.ConnectionStrings["MyDb"].ConnectionString;
    SqlConnection con = new SqlConnection(connectionString);
    string sql = "select * from support";
    SqlDataAdapter da = new SqlDataAdapter(sql, con);

    DataSet ds = new DataSet("Test");
    da.Fill(ds, "support");

    // Convert dataset to XML here

    var docresult = // Converted XML

    Response.Write(docResult);
    Response.ContentType = "text/xml; charset=utf-8";
    Response.AddHeader("Content-Disposition", "attachment; filename=test.xml");
    Response.End();
}

I've been trying all kind of different things but I keep getting errors, so I've left the how to convert DataSet to XML part blank.

And another thing, this query contains columns with special characters.

Solution 1:

You can use ds.WriteXml, but that will require you to have a Stream to put the output into. If you want the output in a string, try this extension method:

public static class Extensions
{
    public static string ToXml(this DataSet ds)
    {
        using (var memoryStream = new MemoryStream())
        {
            using (TextWriter streamWriter = new StreamWriter(memoryStream))
            {
                var xmlSerializer = new XmlSerializer(typeof(DataSet));
                xmlSerializer.Serialize(streamWriter, ds);
                return Encoding.UTF8.GetString(memoryStream.ToArray());
            }
        }
    }
}

USAGE:

var xmlString = ds.ToXml();
// OR
Response.Write(ds.ToXml());

Solution 2:

Simply use Dataset.getXml():

doc.LoadXml(ds.GetXml());

Solution 3:

Write like below code part

DataTable dt = new DataTable("MyData");
dt.WriteXml(@Application.StartupPath + "\\DataBaseValues.xml");

Or, You can convert directly the dataSet also as said by Oded like,

private void WriteXmlToFile(DataSet thisDataSet)
{
   if (thisDataSet == null) 
   {
      return;
   }

   // Create a file name to write to.
   string filename = "myXmlDoc.xml";

   // Create the FileStream to write with.
   System.IO.FileStream myFileStream = new System.IO.FileStream(filename, System.IO.FileMode.Create);

   // Create an XmlTextWriter with the fileStream.
   System.Xml.XmlTextWriter myXmlWriter = 
   new System.Xml.XmlTextWriter(myFileStream, System.Text.Encoding.Unicode);

   // Write to the file with the WriteXml method.
   thisDataSet.WriteXml(myXmlWriter);   
   myXmlWriter.Close();
}

Solution 4:

Use DataSet.WriteXml - it will output the dataset as XML.