XML Extensible Markup Language

-----------------20150123 XML Extensible Markup Language--------------------------------------
XML Extensible Markup Language
XML: Storing data
Attention:
The XML is strictly case-sensitive.
XML tags also appear in pairs.
XML documents have only one root node.
Node
Elements

<?xml version= "1.0" encoding= "Utf-8"?>
<Books>
<Book>
<Name> Gold **</name>
<Price>10</Price>
<Des> good-looking, not explained. </Des>
</Book>
</Books>

To create an XML document from code
1. Referencing a namespace using System.Xml
2. Creating an XML Document Object
XmlDocument doc=new XmlDocument ();
3. Create the first line description information and add it to the doc document
XmlDeclaration Dec=doc. Createxmldeclaration ("1.0", "Utf-8", null);
Doc. AppendChild (DEC);
4. Create the root node
XmlElement Books=doc. CreateElement ("Books");
To add a root node to a document
Doc. Appendchile (books);
5. Create a child node for the root node books
XmlElement Book1=doc. CreateElement ("book");
Adding Book1 to the root node
Books. AppendChild (BOOK1);

6. Add child nodes to Book1
XmlElement Name1=doc. CreateElement ("Name");
Name1. innertext= "Gold * *";
Book1. AppendChild (NAME1);

XmlElement Price1=doc. CreateElement ("Price");
Price1. innertext= "10";
Book1. AppendChild (Price1);

XmlElement Des1=doc. CreateElement ("Des");
Des1. innertext= "Good looking";
Book1. AppendChild (DES1);

Doc. Save ("books.xml");
Console.WriteLine ("Saved successfully");
Console.readkey ();
------------------------------------------------------------------
<?xml version= "1.0" encoding= "Utf-8"?>
<Order>
<CustomeName> Liu Yang </CustomeName>
<CustomerNumber> Liu Yang </CustomerNumber>
<Items>
<orderitem name= "Code table" count= "2"/>
<orderitem name= "Raincoat" count= "Max"/>
<orderitem name= "Glove" count= "1"/>
</Items>
</Order>

To create an XML document with attributes
XmlDocument doc=new XmlDocument ()
XmlDeclaration Dec=doc. Createxmldeclaration ("1.0", "Utf-8", null);
Doc. AppendChild (DEC);

XmlElement Order=doc. CreateElement ("Order");
Doc. AppendChild (order);

XmlElement Customername=doc. CreateElement ("CustomerName");
customername.innertext= "Geng Shiwei";
Order. AppendChild (CustomerName);

XmlElement Customernumber=doc. CreateElement ("CustomerNumber");
customernumber.innertext= "100001";
Order. AppendChild (CustomerNumber);

XmlElement Items=doc. CreateElement ("Items");
Order. AppendChild (items);

XmlElement Orderitem1=doc. CreateElement ("OrderItem");
Adding attributes to a node
Orderitem1.setattribute ("Name", "Inflatable Doll");
Orderitem1.setattribute ("Count", "10");
Items. AppendChild (ORDERITEM1);

XmlElement Orderitem2=doc. CreateElement ("OrderItem");
Adding attributes to a node
Orderitem2.setattribute ("Name", "Inflatable Doll");
Orderitem2.setattribute ("Count", "10");
Items. AppendChild (ORDERITEM2);

XmlElement Orderitem3=doc. CreateElement ("OrderItem");
Adding attributes to a node
Orderitem3.setattribute ("Name", "Inflatable Doll");
Orderitem3.setattribute ("Count", "10");
Items. AppendChild (ORDERITEM3);

Doc. Save ("Order.xml");

-----------------------------Append XML Document------------------------------------------------------
Append XML document
XmlDocument doc=new XmlDocument ();
XmlElement Books;
if (file.exists ("books.xml")) {
If the file exists with the left XML
Doc. Load ("books.xml");
Gets the root node of the file
Books=doc. DocumentElement;
}else{
If the file does not exist
Create first row
XmlDeclaration Dec=doc. Reatexmldeclaration ("1.0", "Utf-8", null);
Doc. AppendChild (DEC);
Creating the root node
Books=doc. CreateElement ("Books");
Doc. AppendChild (books);
}
XmlElement Book1=doc. CreateElement ("book");
Adding Book1 to the root node
Books. AppendChild (BOOK1);

XmlElement Name1=doc. CreateElement ("Name");
Name1. Innertext= "C # development Daquan";
Book1. AppendChild (NAME1);

XmlElement Price1=doc. CreateElement ("Price");
Price1. innertext= "101";
Book1. AppendChild (Price1);

XmlElement Des1=doc. CreateElement ("Des");
Des1. Innertext= "Can not understand";
Book1. AppendChild (DES1);

Doc. Save ("books.xml");

------------------------4. Read the XML document--------------------------------------
XmlDocument doc=new XmlDocument ();
Load the XML to be read
Doc. Load ("books.xml");
Get root node
XmlElement Books=doc. DocumentElement;
Gets the child node that returns the collection of nodes
XmlNodeList Xnl=books. ChildNodes;
foreach (XmlNode item in XNL)
{
Console.WriteLine (item. InnerText);
}
Console.readkey ();

----------------------5, read the XML document with attributes-----------------------------------
XmlDocument Doc =new XmlDocument ();
Doc. Load ("Order.xml");
XmlNodeList Xnl=doc. SelectNodes ("/order/items/orderitem");
foreach (XmlNode node in xnl)
{
Console.WriteLine (node. attributes["Name"]. Value);
Console.WriteLine (node. attributes["Count"]. Value);
}

---------------------6, delete the node---------------------------------------------

XmlDocument Doc =new XmlDocument ();
Doc. Load ("Order.xml");
XmlNode Xn=doc. selectSingleNode ("/order/items");
Xn. RemoveAll ();
Doc. Save ("Order.xml");

Console.WriteLine ("Delete succeeded");

XML Extensible Markup Language