Working with XML. Data in. Net презентация

read-write XML document in .Net?
Using XMLReader
Using Xlinq
Using Serialization

tags
Uses DTD ( Document Type Definition ) or Schemas to describe the data

Sony
16
CD-RW disks


Verbatim
52
DVD+R disks

What is XML?

cross-overlapped.

Alan
Turing

computer scientist
mathematician
cryptographer

What is XML?

element consists of opening tag and closing tag Lion
Lion animal is the element, class is the attribute and mammals is the value
XML Attributes values ​​are in single quotes (') or double quotes (").

Alan Turing


Element:




Attribute:

What is XML?

alphanumeric character (letters A - Z , a – z, 0 -9).
XML names may also include non-English letters, numbers, and ideograms such as ö.
XML names can’t contain other punctuation characters such as quotation marks(“), apostrophes(‘), dollar signs($), carets (^), percent symbols (%), and semicolons(;).
Comments are written like this:
CDATA section: . Everything between the is treated as raw character data.
Lion ]]> The element will not be interpreted

What is XML?

reference to a Document Type Definition (DTD) or XSD (XML Schema Definition), where its elements and attributes and grammatical rules for them are declared .
DTD or XML Schema includes:
Element and attribute names;
Relationships between elements and attributes and their structure;
Data types.

(first_name, last_name)>

Alan
Turing

? - Zero or one of the element is allowed.
* - Zero or more of the element is allowed.
+ - One or more of the element is required.

computer scientist
mathematician
cryptographer

computer scientist

Alan
Turing

]>


Alan
Turing

computer scientist
mathematician
cryptographer

DTD Example

that you have created by the URL.
For external DTD subset, standalone=“no”.




If your DTD will be used by others, you should name your DTD in a standard way by a formal public identifier (FPI):

"http://www.animals.com/xml/person.dtd">

DTD Example

width CDATA #REQUIRED
height CDATA #REQUIRED
alt CDATA #IMPLIED
>
CDATA attribute value can contain any string of text acceptable in a well-formed XML attribute value.
NMTOKEN: (name token) may consist of the same characters as an XML name, that is, alphanumeric and/or ideographic characters and the punctuation marks _, -, ., and :.
NMTOKENS contains one or more XML name tokens separated by whitespace.

Kat and the Kings

DTD Example

May | June | July | August | September | October | November | December) #REQUIRED>
ENTITY attribute contains the name of an unparsed entity declared elsewhere in the DTD.


ID attribute may contain an XML name that is unique within the XML document.
IDREF type attribute refers to the ID type attribute of some element in the document. Thus, it must be an XML name.

DTD Example

Karli Watson
7582



Simon Robinson
7043

processing and visualization).
There are two basic types of parsers:
Simple API for XML (SAX) and
Document Object Model (DOM).
SAX is based on the cursor and the events that occur when passing over the nodes of XML documents.
DOM loads the document completely in memory and presents it in a tree.

on the client side.
XML has no default formatting and needs information about how a tag will be displayed before being shown on a browser.
Every element that is styled with CSS can be thought of as an invisible box.
The user controls the size, color, and spacing of this box.

lion

350 pounds

350 pounds

?>

animal.css:
animal {display:block}
weight {display:block}
height {display:inline}
Block-level elements start at the beginning of a line
Inline elements appear within a line
Elements can be not displayed at all
height {display:none}

Cascading Style Sheet (CSS)

original position.
description {display:block;position:relative;left:100px}
absolute -Moves the element with respect to the parent position.
description {display:block;position:absolute;left:100px}
Setting the Height or Width.
description {display:block;position:relative;left:100px; width:340px}
Changing the Foreground Color.
name{display:block;color:magenta}
Changing the Background.
name{display:block;color:magenta; background:url(background.jpg)}
name{display:block;color:magenta; background:color:magenta}

Cascading Style Sheet (CSS)

be bold, bolder, or lighter)
name{font-style:italic}
Underline and Font Size.
name{text-decoration:underline}
name{font-size:10pt}
font size can also be absolute like small, medium, large

Cascading Style Sheet (CSS)

in .Net to parse XML document:
Using XmlReader
Using XLINQ
Using XmlSerializer
Assume that we have XML file as response from some Web Service:

John
24

responseReader.ReadContentAsString();
responseReader.ReadEndElement();

responseReader.ReadStartElement("Age");
int age = responseReader.ReadContentAsInt();
responseReader.ReadEndElement();

responseReader.ReadEndElement();

XML document, construct an XmlReaderSettings object that contains an XML schema definition language (XSD) schema with which to validate the XML document.
An individual schema or a set of schemas (as an XmlSchemaSet) can be added to an XmlSchemaSet by passing either one as a parameter to the Add method of XmlSchemaSet. 

Using XmlReader

static void Main()
{
XmlReaderSettings booksSettings = new XmlReaderSettings();
booksSettings.Schemas.Add("http://www.contoso.com/books", "books.xsd");
booksSettings.ValidationType = ValidationType.Schema;
booksSettings.ValidationEventHandler += new ValidationEventHandler(
booksSettingsValidationEventHandler);
XmlReader books = XmlReader.Create("books.xml", booksSettings);
while (books.Read())
{ }
}

e)
{
if (e.Severity == XmlSeverityType.Warning)
{
Console.Write("WARNING: ");
Console.WriteLine(e.Message);
}
else 
if (e.Severity == XmlSeverityType.Error)
{
Console.Write("ERROR: ");
Console.WriteLine(e.Message);
}
}

name = (string)user.Element("Name");
int age = (int)user.Element("Age");

XML tree against an XML Schema Definition Language (XSD) file - Validate() methods
Validate() methods use an underlying XmlReader to validate the XML tree against an XSD.
Validation error and warning messages are handled using the ValidationEventHandler delegate. If no event handler is provided to these methods, validation errors are exposed as an XmlSchemaValidationException.

Using XLINQ

XmlSchemaSet schemas = new XmlSchemaSet();
schemas.Add("", "CustomersOrders.xsd");

XDocument custOrdDoc = XDocument.Load("CustomersOrders.xml");
bool errors = false;
custOrdDoc.Validate(schemas, (o, e) =>
{
Console.WriteLine("{0}", e.Message); errors = true;
});

where the mapping from XML elements/attributes to object properties is controlled by the application developer.
The following CLR type is created and use the XmlElementAttribute and XmlAttributeAttribute to ensure that the names of elements and attributes match those in the XML.

public class User
{
[XmlAttribute]
public bool IsMember { get; set; }

[XmlElement]
public string Name { get; set; }

[XmlElement]
public int Age { get; set; }
}

of the User class.

Using XmlSerializer

XmlSerializer serializer = new XmlSerializer(typeof(User));
User user = (User)serializer.Deserialize(responseStream);

bool isMember = user.IsMember;
string name = user.Name;
int age = user.Age;