How to get Custom Namespaces and Prefix for an XML file?

Question

I have a structure in which I fill in data and I want to save it as an XML file. How can I set Namespaces and Prefix so as to obtain an XML file with the structure as in the example below? Thank you!

public class AuditFile
{
	public Header Header { get; set; }
}	

public class Header
{			
	public string AuditFileVersion { get; set; }
	public string AuditFileCountry { get; set; }
	public string AuditFileRegion { get; set; }
}

fill and save:

AuditFile doc = new AuditFile();
Header header = new Header();
//fill with data
doc.Header = header;

XmlSerializer x = new System.Xml.Serialization.XmlSerializer(doc.GetType());
TextWriter writer = new StreamWriter(@"C:\Docs\document.xml");
x.Serialize(writer, doc);
writer.Close();

desired XML structure:

<?xml version="1.0" encoding="UTF-8"?>
<nsSAFT:AuditFile xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:nsSAFT="mfp:anaf:dgti:d406:declaratie:v1" xsi:schemaLocation="urn:StandardAuditFile-Taxation-Financial:RO schema.xsd">
	<nsSAFT:Header>
		<nsSAFT:AuditFileVersion>1.0</nsSAFT:AuditFileVersion>				
<nsSAFT:AuditFileCountry>RO</nsSAFT:AuditFileCountry>
	</nsSAFT:Header>
</nsSAFT:AuditFile>	

Answer 1

Hi @TRAIAN MACAVEIU , Welcome to Microsoft Q&A,

You want to add the namespace prefix nsSAFT: to each node to ensure that the entire XML structure uses that prefix. To achieve this, you need to explicitly add the namespace prefix when generating the XML file. To generate XML files with a specific namespace and prefix, you can use the XmlSerializerNamespaces class to specify the namespace and prefix.

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Xml;
using System.Xml.Serialization;

namespace xx
{

public class AuditFile
{
    [XmlElement(Namespace = "mfp:anaf:dgti:d406:declaratie:v1")]
    public Header Header { get; set; }
}

public class Header
{
    public string AuditFileVersion { get; set; }
    public string AuditFileCountry { get; set; }
}

    internal class Program
    {
        static void Main(string[] args)
        {
        AuditFile doc = new AuditFile();
        Header header = new Header();
        // Fill with data
        header.AuditFileVersion = "1.0";
        header.AuditFileCountry = "RO";
        doc.Header = header;

        XmlSerializerNamespaces namespaces = new XmlSerializerNamespaces();
        namespaces.Add("nsSAFT", "mfp:anaf:dgti:d406:declaratie:v1");
        namespaces.Add("xsi", "http://www.w3.org/2001/XMLSchema-instance");

        XmlSerializer x = new XmlSerializer(typeof(AuditFile));

        // Configure XmlWriter to add namespace prefixes
        XmlWriterSettings settings = new XmlWriterSettings();
        settings.Indent = true;

        using (XmlWriter writer = XmlWriter.Create(@"C:\Users\Administrator\Desktop\demo.xml", settings))
        {
            writer.WriteStartElement("nsSAFT", "AuditFile", "mfp:anaf:dgti:d406:declaratie:v1");
            writer.WriteAttributeString("xmlns", "xsi", null, "http://www.w3.org/2001/XMLSchema-instance");
            writer.WriteAttributeString("xsi", "schemaLocation", null, "urn:StandardAuditFile-Taxation-Financial:RO schema.xsd");

            // Serialize the whole AuditFile object
            x.Serialize(writer, doc, namespaces);

            writer.WriteEndElement();
        }
    }
        }
    }

Best Regards,

Jiale

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