how to retrieve, Update, append and delete record from xml file

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Hello house;

I am working on a project that requires me to use xml file to save user's record, i have been to save the record, but still having issues appending a new record, deleting a record, updating and retrieving records, i have done a few searches online, but no success. Below is my code:

C#

var writer = new XmlTextWriter( "XMLFile1.xml", System.Text.Encoding.UTF8 );
            writer.WriteStartDocument( true );
            writer.Formatting = Formatting.Indented;
            writer.Indentation = 2;
            writer.WriteStartElement( "Table" );
            createNode( "5", "Product 5", "5000", writer );
            createNode( "6", "Product 6", "5000", writer );
            createNode( "7", "Product 7", "5000", writer );
            createNode( "9", "Product 8", "5000", writer );
            writer.WriteEndElement( );
            writer.WriteEndDocument( );
            writer.Close( );

C#

private void createNode(string pID, string pName, string pPrice, XmlTextWriter writer)
        {
            writer.WriteStartElement( "Product" );
            writer.WriteStartElement( "Product_id" );
            writer.WriteString( pID );
            writer.WriteEndElement( );
            writer.WriteStartElement( "Product_name" );
            writer.WriteString( pName );
            writer.WriteEndElement( );
            writer.WriteStartElement( "Product_price" );
            writer.WriteString( pPrice );
            writer.WriteEndElement( );
            writer.WriteEndElement( );
        }

The above codes writes successfully to xml file, i want o be able to retrieve, append new record, update and delete record. Any assistance will be greatly appreciated. Thanks in advance.

Posted 9-Jul-14 0:42am

Uwakpeter

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Comments

George Jonsson 9-Jul-14 6:47am

You should consider looking into XDocument and XElement.
I find LINQ easier to deal with in these cases.

Uwakpeter 9-Jul-14 6:59am

i have not used LINQ before, but i wouldn't mind if you could assist.

2 solutions

Solution 1

Check this out:
1. insert-update-delete-in-xml-file-using-C-Sharp/[^]
2. How to Append to a Large XML File[^]

Posted 9-Jul-14 0:47am

Peter Leow

Updated 9-Jul-14 0:48am

v2

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George Jonsson · Accepted Answer · 2014-07-09T01:22:00

If you use LINQ with XDocument and XElement I think it is easier for you.

C#

XElement xeTable = new XElement("Table");

XElement xeProducts = new XElement("Product");
createNode("5", "Product 5", "5000", xeProducts);
createNode("6", "Product 6", "5000", xeProducts);
createNode("7", "Product 7", "5000", xeProducts);
createNode("8", "Product 8", "5000", xeProducts);

xeTable.Add(xeProducts);

XDocument xdoc = new XDocument();
xdoc.Declaration = new XDeclaration("1.0", "utf8", "yes");
xdoc.Add(xeTable);
xdoc.Save(@"XMLFile1.xml");

C#

private void createNode(string pID, string pName, string pPrice, XElement xeProducts)
{
    XElement xeProduct = new XElement("Product");
    xeProduct.Add(new XElement("Product_id", pID));
    xeProduct.Add(new XElement("Product_name", pName));
    xeProduct.Add(new XElement("Product_price", pPrice));
    xeProducts.Add(xeProduct);
}

Resulting XML

XML

<Products>
  <Product>
    <Product_id>5</Product_id>
    <Product_name>Product 5</Product_name>
    <Product_price>5000</Product_price>
  </Product>
  <Product>
    <Product_id>6</Product_id>
    <Product_name>Product 6</Product_name>
    <Product_price>5000</Product_price>
  </Product>
  <Product>
    <Product_id>7</Product_id>
    <Product_name>Product 7</Product_name>
    <Product_price>5000</Product_price>
  </Product>
  <Product>
    <Product_id>8</Product_id>
    <Product_name>Product 8</Product_name>
    <Product_price>5000</Product_price>
  </Product>
</Products>

Example of how to read the file:

C#

XDocument xdoc2 = XDocument.Load(@"XMLFile1.xml");
XElement xeProducts2 = xdoc2.Root.Element("Products");

XElement xeProduct7 = xeProducts.Elements("Product").
Where(x => x.Element("Product_id").Value == "7").FirstOrDefault();

Result of the query:

XML

<Product>
  <Product_id>7</Product_id> 
  <Product_name>Product 7</Product_name> 
  <Product_price>5000</Product_price> 
</Product>

Access the members

C#

string productName = xeProduct7.Element("Product_name").Value;

Append

C#

XDocument xdoc = XDocument.Load(@"XMLFile1.xml");
XElement xeProducts = xdoc.Root.Element("Products");
createNode("10", "Product 10", "10000", xeProducts);
xdoc.Save(@"XMLFile1.xml");

Delete

C#

XDocument xdoc = XDocument.Load(@"XMLFile1.xml");
XElement xeProducts = xdoc.Root.Element("Products");
XElement xeProduct7 = xeProducts.Elements("Product").
   Where(x => x.Element("Product_id").Value == "7").FirstOrDefault();
xeProduct7.Remove();
xdoc.Save(@"XMLFile1.xml");

From here on you need to use your own brain la.