XML读写

 

    private static void WriteXML()
    {
        XmlWriter writer = null;

        try
        {

            //XmlWriterSettings settings = new XmlWriterSettings();
            //settings.Indent = true;
            //writer.Settings = settings;

            writer = XmlWriter.Create(@"c:\abc.xml");
            
            writer.WriteComment("sample XML fragment");

            // Write an element (this one is the root).
            writer.WriteStartElement("book");

            // Write the namespace declaration.
            writer.WriteAttributeString("xmlns", "bk", null, "urn:samples");

            // Write the genre attribute.
            writer.WriteAttributeString("genre", "novel");

            // Write the title.
            writer.WriteStartElement("title");
            writer.WriteString("The Handmaid's Tale");
            writer.WriteEndElement();

            // Write the price.
            writer.WriteElementString("price", "19.95");

            // Lookup the prefix and write the ISBN element.
            string prefix = writer.LookupPrefix("urn:samples");
            writer.WriteStartElement(prefix, "ISBN", "urn:samples");
            writer.WriteString("1-861003-78");
            writer.WriteEndElement();

            // Write the style element (shows a different way to handle prefixes).
            writer.WriteElementString("style", "urn:samples", "hardcover");

            writer.WriteElementString("price", "19.95");

            // Write the close tag for the root element.
            writer.WriteEndElement();

            // Write the XML to file and close the writer.
            writer.Flush();
            writer.Close();
        }

        finally
        {
            if (writer != null)
                writer.Close();
        }
    }


    private static void ReadXML1()
    {
        XmlDocument doc = new XmlDocument();
        doc.Load(@"c:\booksort.xml");

        XmlNodeList nodeList;
        XmlNode root = doc.DocumentElement;

        nodeList = root.SelectNodes("descendant::book[title='Emma']");

        //Change the price on the books.
        foreach (XmlNode book in nodeList)
        {
            book.LastChild.InnerText = "15.95";
        }

        nodeList = root.SelectNodes("descendant::music[price='10']");


    }

    private static void ReadXML()
    {
        //XmlTextReader reader;
        //reader = new XmlTextReader(@"c:\test.xml");

        XmlReaderSettings settings = new XmlReaderSettings();
        settings.ProhibitDtd = false;

        XmlReader reader;
        reader = XmlReader.Create(@"c:\test.xml", settings);


        //reader.MoveToContent();
        //reader.WhitespaceHandling = WhitespaceHandling.None;

        // Parse the file and display each of the nodes.
        while (reader.Read())
        {
            switch (reader.NodeType)
            {
                case XmlNodeType.Element:
                    Console.Write("<{0}>", reader.Name);
                    break;
                case XmlNodeType.Text:
                    Console.Write(reader.Value);
                    break;
                case XmlNodeType.CDATA:
                    Console.Write("<![CDATA[{0}]]>", reader.Value);
                    break;
                case XmlNodeType.ProcessingInstruction:
                    Console.Write("<?{0} {1}?>", reader.Name, reader.Value);
                    break;
                case XmlNodeType.Comment:
                    Console.Write("<!--{0}-->", reader.Value);
                    break;
                case XmlNodeType.XmlDeclaration:
                    Console.Write("<?xml version='1.0'?>");
                    break;
                case XmlNodeType.Document:
                    break;
                case XmlNodeType.DocumentType:
                    Console.Write("<!DOCTYPE {0} [{1}]", reader.Name, reader.Value);
                    break;
                case XmlNodeType.EntityReference:
                    Console.Write(reader.Name);
                    break;
                case XmlNodeType.EndElement:
                    Console.Write("</{0}>", reader.Name);
                    break;
            }
        }
    }