C＃将XML划分为多个部分

Question

I am trying to divide an XML file into parts I have an XML file like this

<?xml version="1.0" encoding="utf-8"?>
<RegistrationOpenData xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://example.gov">
<Description>Registration data is collected by ABC XYZ</Description>
<InformationURL>http://www.example.com/html/hpd/property-reg-unit.shtml</InformationURL>
<SourceAgency>ABC Department of Housing</SourceAgency>
<SourceSystem>PREMISYS</SourceSystem>
<StartDate>2016-02-29T00:03:06.642772-05:00</StartDate>
<EndDate i:nil="true" />
<Registrations>
<Registration xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
<RegistrationID>1</RegistrationID>
<BuildingID>1A</BuildingID>
<element1>E11</element1>
<element2>E21</element2>
<element3>E31</element3>
<element4>E41</element4>
</Registration>
<Registration xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
<RegistrationID>2</RegistrationID>
<BuildingID>2A</BuildingID>
<element1>E21</element1>
<element2>E22</element2>
<element3>E32</element3>
<element4>E42</element4>
</Registration>
</Registrations>
</RegistrationOpenData>

And I am trying to fetch the number of nodes trough this code

XmlDocument doc = null;
doc = new XmlDocument();
doc.Load(@"D:\Registrations20160229.xml");
XmlNodeReader nodeReader = new XmlNodeReader(doc);
XmlElement root = doc.DocumentElement;
XmlNodeList elemList = root.GetElementsByTagName("Registration");
int totalnode = elemList.Count;
int nodehalf = totalnode / 2;
MessageBox.Show(nodehalf.ToString());

But after this I am unable to proceed, This code I have used to calculate number of Registration Nodes and then made them into half, now I don't know how to proceed further to split this file, I have total of 158718 entries (Registration Nodes) inside the file (sometimes even more) and I am trying to break all into parts, maybe 3 to 4 parts.

Answer 1

Try this , it should not load whole xml to memory

        using(XmlReader reader = XmlReader.Create(new FileStream(@"D:\Registrations20160229.xml" , FileMode.Open))){
                        while (reader.Read())
        {
            if(reader.NodeType == XmlNodeType.Element && reader.Name == "Registration")
                counter++;
        }
        Console.WriteLine(counter);
        }