I have a collection string with information about customers like name, gender etc. All custumers have an id.
Now i want to create a common XML file with all customers in it. Something like example below:
<custumers>
<custumer>
<name></name>
<id></id>
<etc></etc>
</custumer>
</custumers>
The start up with no XML file is easy, I used linq to create the xml file.
For initial creation I used following code:
try
{
var xEle = new XElement("Customers",
from cus in cusList
select new XElement("Customer",
new XElement("Name", cus.Name),
new XElement("gender", cus.gender),
new XElement("etc", cus.etc));
}
xEle.Save(path);
But on the point if i want to update the XML file i get some problems to get it. My approach to solve it:
Iterate over all customers in list and check for all customers if the customer.id exists in the XML.
IF not: add new customer to xml
IF yes: update values
My code so far:
var xEle = XDocument.Load(xmlfile);
foreach (cus in cusList)
try
{
var cids = from cid in xEle.Descendants("ID")
where Int32.Parse(xid.Element("ID").Value) == cus.ID
select new XElement("customer", cus.name),
new XElement ("gender"), cus.gender),
new XELement ("etc."), cus.etc)
);
xEle.Save(xmlpath);
}
How about a different approach....
using System.IO;
using System.Text;
using System.Xml.Serialization;
public void Main()
{
DataSet Custumers = new DataSet("Custumers");
DataTable Custumer = new DataTable("Custumer");
// Create the columns
Custumer.Columns.Add("id", typeof(int)).Unique = true;
Custumer.Columns.Add("name", typeof(string));
Custumer.Columns.Add("gender", typeof(string));
Custumer.Columns.Add("etc", typeof(string));
// Set the primary key
Custumer.PrimaryKey = { Custumer.Columns("id") };
// Add table to dataset
Custumers.Tables.Add(Custumer);
Custumers.AcceptChanges();
// Add a couple of rows
Custumer.Rows.Add(1, "John", "male", "whatever");
Custumer.Rows.Add(2, "Jane", "female", "whatever");
Custumer.AcceptChanges();
// Let's save this to compare to the updated version
Custumers.WriteXml("Custumers_Original.xml");
// Read in XML that contains an existing Custumer and adds a new one
// into a Clone of the Custumer table
DataTable CustumerUpdate = Custumer.Clone;
CustumerUpdate.ReadXml("Custumers_Update.xml");
// Merge the clone table data to the Custumer table
Custumer.Merge(CustumerUpdate);
Custumer.AcceptChanges();
Custumers.WriteXml("Custumers_Final.xml");
}
Custumers_Original.xml looks like this:
<?xml version="1.0" standalone="yes"?>
<Custumers>
<Custumer>
<id>1</id>
<name>John</name>
<gender>male</gender>
<etc>whatever</etc>
</Custumer>
<Custumer>
<id>2</id>
<name>Jane</name>
<gender>female</gender>
<etc>whatever</etc>
</Custumer>
</Custumers>
Custumers_Update.xml has this, making a change to John
and adding George
:
<?xml version="1.0" encoding="utf-8" ?>
<Custumers>
<Custumer>
<name>John</name>
<id>1</id>
<gender>male</gender>
<etc>this is new</etc>
</Custumer>
<Custumer>
<name>George</name>
<id>3</id>
<gender>male</gender>
<etc>grandson</etc>
</Custumer>
</Custumers>
After the merge, the Custumers_Final.xml contains this:
<?xml version="1.0" standalone="yes"?>
<Custumers>
<Custumer>
<id>1</id>
<name>John</name>
<gender>male</gender>
<etc>this is new</etc>
</Custumer>
<Custumer>
<id>2</id>
<name>Jane</name>
<gender>female</gender>
<etc>whatever</etc>
</Custumer>
<Custumer>
<id>3</id>
<name>George</name>
<gender>male</gender>
<etc>grandson</etc>
</Custumer>
</Custumers>
Also my solution with linq:
try
{
XDocument xEle = XDocument.Load(path);
var ids = from id in xEle.Descendants("Custom")
where id.Element("id").Value == cus.ID
select id;
foreach (XElement idCustom in ids)
{
idCustom.SetElementValue("NewName", "NewElement");
}
xEle.Save(path);
}
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