Csharp/C Sharp/XML/XML Read
Содержание
Access Attributes
<source lang="csharp">
using System; using System.Collections.Generic; using System.Text; using System.Xml; class Program {
static void Main(string[] args) { XmlDocument documentation = new XmlDocument(); documentation.Load("DocumentedClasses.xml"); XmlNodeList memberNodes = documentation.SelectNodes("//member"); List<XmlNode> typeNodes = new List<XmlNode>(); foreach (XmlNode node in memberNodes) { if (node.Attributes["name"].Value.StartsWith("T")) { typeNodes.Add(node); } } foreach (XmlNode node in typeNodes) { Console.WriteLine("- {0}", node.Attributes["name"].Value.Substring(2)); } }
}
</source>
If a Xml node Has Attributes
<source lang="csharp"> using System; using System.Xml; using System.IO; using System.Text; class MainClass {
private static void Main() { FileStream fs = new FileStream("products.xml", FileMode.Create); XmlWriter w = XmlWriter.Create(fs); w.WriteStartDocument(); w.WriteStartElement("products"); w.WriteStartElement("product"); w.WriteAttributeString("id", "1001"); w.WriteElementString("productName", "Gourmet Coffee"); w.WriteElementString("productPrice", "0.99"); w.WriteEndElement(); w.WriteStartElement("product"); w.WriteAttributeString("id", "1002"); w.WriteElementString("productName", "Blue China Tea Pot"); w.WriteElementString("productPrice", "102.99"); w.WriteEndElement(); w.WriteEndElement(); w.WriteEndDocument(); w.Flush(); fs.Close(); fs = new FileStream("products.xml", FileMode.Open); XmlReader r = XmlReader.Create(fs); while (r.Read()) { if (r.NodeType == XmlNodeType.Element) { Console.WriteLine("<" + r.Name + ">"); if (r.HasAttributes) { for (int i = 0; i < r.AttributeCount; i++) { Console.WriteLine("\tATTRIBUTE: " + r.GetAttribute(i)); } } } else if (r.NodeType == XmlNodeType.Text) { Console.WriteLine("\tVALUE: " + r.Value); } } }
}
</source>
Illustrates the XmlTextReader class
<source lang="csharp"> /* Mastering Visual C# .NET by Jason Price, Mike Gunderloy Publisher: Sybex; ISBN: 0782129110
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/*
Example20_2.cs illustrates the XmlTextReader class
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using System; using System.Xml; public class Example20_2 {
// Display a node and its children private static void AddChildren(XmlNode xnod, int level) { XmlNode xnodWorking; String pad = new String(" ", level * 2); Console.WriteLine(pad + xnod.Name + "(" + xnod.NodeType.ToString() + ": " + xnod.Value + ")"); // if this is an element, extract any attributes if (xnod.NodeType == XmlNodeType.Element) { XmlNamedNodeMap mapAttributes = xnod.Attributes; for(int i=0; i<mapAttributes.Count; i+=1) { Console.WriteLine(pad + " " + mapAttributes.Item(i).Name + " = " + mapAttributes.Item(i).Value); } } // call recursively on all children of the current node if (xnod.HasChildNodes) { xnodWorking = xnod.FirstChild; while (xnodWorking != null) { AddChildren(xnodWorking, level+1); xnodWorking = xnodWorking.NextSibling; } }
} public static void Main() { // use an XmlTextReader to open an XML document XmlTextReader xtr = new XmlTextReader(@"c:\temp\Cust4.xml"); xtr.WhitespaceHandling = WhitespaceHandling.None; // load the file into an XmlDocuent XmlDocument xd = new XmlDocument(); xd.Load(xtr); // get the document root node XmlNode xnodDE = xd.DocumentElement; // recursively walk the node tree AddChildren(xnodDE, 0); // close the reader xtr.Close(); }
} //File: Cust4.xml /* <?xml version="1.0" encoding="UTF-8"?> <?xml-stylesheet type="text/xsl" href="Cust.xsl"?> <NewDataSet>
<Customers> <CustomerID>ALFKI</CustomerID> <CompanyName>Alfreds Futterkiste</CompanyName> <ContactName>Maria Anders</ContactName> <ContactTitle>Sales Representative</ContactTitle> <Address>Obere Str. 57</Address> <City>Berlin</City> <PostalCode>12209</PostalCode> <Country>Germany</Country> <Phone>030-0074321</Phone> <Fax>030-0076545</Fax> </Customers> <Customers> <CustomerID>BONAP</CustomerID> <CompanyName>app</CompanyName> <ContactName>Laurence Lebihan</ContactName> <ContactTitle>Owner</ContactTitle> <Address>12, rue des Bouchers</Address> <City>Marseille</City> <PostalCode>13008</PostalCode> <Country>France</Country> <Phone>91.24.45.40</Phone> <Fax>91.24.45.41</Fax> </Customers>
</NewDataSet>
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</source>
Load xml document from xml file
<source lang="csharp"> using System; using System.Xml;
class XMLDemo{ [STAThread] static void Main(string[] args) { XmlDocument xmlDom = new XmlDocument(); xmlDom.AppendChild(xmlDom.CreateElement("", "books", "")); XmlElement xmlRoot = xmlDom.DocumentElement; XmlElement xmlBook; XmlElement xmlTitle, xmlAuthor, xmlPrice; XmlText xmlText; xmlBook= xmlDom.CreateElement("", "A", ""); xmlBook.SetAttribute("property", "", "a"); xmlTitle = xmlDom.CreateElement("", "B", ""); xmlText = xmlDom.CreateTextNode("text"); xmlTitle.AppendChild(xmlText); xmlBook.AppendChild(xmlTitle); xmlRoot.AppendChild(xmlBook); xmlAuthor = xmlDom.CreateElement("", "C", ""); xmlText = xmlDom.CreateTextNode("textg"); xmlAuthor.AppendChild(xmlText); xmlBook.AppendChild(xmlAuthor); xmlPrice = xmlDom.CreateElement("", "D", ""); xmlText = xmlDom.CreateTextNode("99999"); xmlPrice.AppendChild(xmlText); xmlBook.AppendChild(xmlPrice); xmlRoot.AppendChild(xmlBook); Console.WriteLine(xmlDom.InnerXml); xmlDom.Save("books.xml"); XmlDocument xmlDom2 = new XmlDocument(); xmlDom2.Load("books.xml"); Console.WriteLine(xmlDom2.InnerXml); } }
</source>
Load Xml Document Sample
<source lang="csharp"> /*
* C# Programmers Pocket Consultant * Author: Gregory S. MacBeth * Email: gmacbeth@comporium.net * Create Date: June 27, 2003 * Last Modified Date: * Version: 1 */
using System; using System.IO; using System.Xml; namespace Client.Chapter_22___XML {
public class LoadXmlDocumentSample { private const String document = "books.xml"; public static void Main() { LoadXmlDocumentSample myLoadXmlDocumentSample = new LoadXmlDocumentSample(); myLoadXmlDocumentSample.Run(document); } public void Run(String args) { try { // Load the XML from file Console.WriteLine(); Console.WriteLine("Loading file {0} ...", args); XmlDataDocument myXmlDocument = new XmlDataDocument(); myXmlDocument.Load(args); Console.WriteLine("XmlDataDocument loaded with XML data successfully ..."); // Display the XML document. myXmlDocument.Save(Console.Out); } catch (Exception e) { Console.WriteLine("Exception: {0}", e.ToString()); } } }
} //File:book.xml /* <book>
<title>Book title</title>
</book>
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</source>
Read An XML File
<source lang="csharp"> /*
* C# Programmers Pocket Consultant * Author: Gregory S. MacBeth * Email: gmacbeth@comporium.net * Create Date: June 27, 2003 * Last Modified Date: * Version: 1 */
using System; using System.IO; using System.Xml;
namespace Client.Chapter_22___XML {
public class ReadAnXMLFile { private const string doc = "Test.xml"; static void Main(string[] args) { XmlTextReader reader = null; // Load the file with an XmlTextReader reader = new XmlTextReader(doc); // Read the File while (reader.Read()) { //TODO - } if (reader != null) reader.Close(); } }
}
</source>
Reading from an XML file.
<source lang="csharp"> using System; using System.Xml; public class MainClass {
public static void Main(string[] args) { XmlTextReader reader = new XmlTextReader(args[0]); while (reader.Read()) { switch (reader.NodeType) { case XmlNodeType.Element: // The node is an Element Console.WriteLine("Element: " + reader.Name); while (reader.MoveToNextAttribute()) // Read attributes Console.WriteLine(" Attribute: [" + reader.Name + "] = "" + reader.Value + """); break; case XmlNodeType.DocumentType: // The node is a DocumentType Console.WriteLine("Document: " + reader.Value); break; case XmlNodeType.rument: Console.WriteLine("Comment: " + reader.Value); break; } } reader.Close(); }
}
</source>
Read XML From URL
<source lang="csharp"> /*
* C# Programmers Pocket Consultant * Author: Gregory S. MacBeth * Email: gmacbeth@comporium.net * Create Date: June 27, 2003 * Last Modified Date: * Version: 1 */
using System; using System.IO; using System.Xml;
namespace Client.Chapter_22___XML {
public class ReadXMLFromURL { static void Main(string[] args) { string localURL = "http:\\somehost\\Test.xml"; XmlTextReader myXmlURLreader = null; myXmlURLreader = new XmlTextReader (localURL); while (myXmlURLreader.Read()) { //TODO - } if (myXmlURLreader != null) myXmlURLreader.Close(); } }
}
</source>