SilverLight学习笔记--XML操作
XML操作
将 XMLWriter 内容保存至客户端
修改 page.xaml 文件
<TextBlock x:Name ="OutputTextBlock" Canvas.Top ="10" TextWrapping="Wrap"/>
在应用程序的 page.xaml.cs源文件中，添加下面的 using 语句：
sing System.Xml;
using System.IO;
using System.Text;
using System.IO.IsolatedStorage;
全部代码：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.Xml;
using System.IO;
using System.Text;
using System.IO.IsolatedStorage;
namespace SilverlightApplication7
{
public partial class Page : UserControl
{
public Page()
{
InitializeComponent();
using (IsolatedStorageFile isoStore =
IsolatedStorageFile.GetUserStoreForApplication())
{
// Create new file
using (IsolatedStorageFileStream isoStream =
new IsolatedStorageFileStream("IsoStoreFile.xml",
FileMode.Create, isoStore))
{
// Write to the Isolated Storage for the user.
XmlWriterSettings settings = new XmlWriterSettings();
settings.Indent = true;
// Create an XmlWriter.
using (XmlWriter writer = XmlWriter.Create(isoStream, settings))
{
writer.WriteComment("sample XML document");
// 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");
writer.WriteStartElement(null, "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");
// Write the close tag for the root element.
writer.WriteEndElement();
// Write the XML to the file.
writer.Flush();
}
}
// Open the file again for reading.
using (StreamReader reader =
new StreamReader(isoStore.OpenFile("IsoStoreFile.xml", FileMode.Open)))
{
OutputTextBlock.Text = reader.ReadToEnd();
}
// Delete the IsoStoreFile.xml file.
//isoStore.DeleteFile("IsoStoreFile.xml");
}
}
}
}
使用 XmlReader 分析 XML
StringBuilder output = new StringBuilder();
String xmlString =
@"<?xml version='1.0'?>
<!-- This is a sample XML document -->
<Items>
<Item>test with a child element <more/> stuff</Item>
</Items>";
// Create an XmlReader
using (XmlReader reader = XmlReader.Create(new StringReader(xmlString)))
{
XmlWriterSettings ws = new XmlWriterSettings();
ws.Indent = true;
using (XmlWriter writer = XmlWriter.Create(output, ws))
{
// Parse the file and display each of the nodes.
while (reader.Read())
{
switch (reader.NodeType)
{
case XmlNodeType.Element:
writer.WriteStartElement(reader.Name);
break;
case XmlNodeType.Text:
writer.WriteString(reader.Value);
break;
case XmlNodeType.XmlDeclaration:
case XmlNodeType.ProcessingInstruction:
writer.WriteProcessingInstruction(reader.Name, reader.Value);
break;
case XmlNodeType.Comment:
writer.WriteComment(reader.Value);
break;
case XmlNodeType.EndElement:
writer.WriteFullEndElement();
break;
}
}
}
}
OutputTextBlock.Text = output.ToString();
使用 XmlReader 方法读取元素和属性的内容
StringBuilder output = new StringBuilder();
String xmlString =
@"<bookstore>
<book genre='autobiography' publicationdate='1981-03-22' ISBN='1-861003-11-0'>
<title>The Autobiography of Benjamin Franklin</title>
<author>
<first-name>Benjamin</first-name>
<last-name>Franklin</last-name>
</author>
<price>8.99</price>
</book>
</bookstore>";
// Create an XmlReader
using (XmlReader reader = XmlReader.Create(new StringReader(xmlString)))
{
reader.ReadToFollowing("book");
reader.MoveToFirstAttribute();
string genre = reader.Value;
output.AppendLine("The genre value: " + genre);
reader.ReadToFollowing("title");
output.AppendLine("Content of the title element: " + reader.ReadElementContentAsString());
}
OutputTextBlock.Text = output.ToString();
LINQ to XML 创建动态 XAML
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.Windows.Markup;
using System.Xml;
using System.Xml.Linq;
using System.IO;
using System.Text;
namespace SilverlightApplication7
{
public partial class Page : UserControl
{
public Page()
{
InitializeComponent();
XElement contacts =
new XElement("Contacts",
new XElement("Contact1",
new XAttribute("Att1", 1),
new XElement("Name", "Patrick Hines"),
new XElement("Phone", "206-555-0144"),
new XElement("Address",
new XElement("Street1", "123 Main St"),
new XElement("City", "Mercer Island"),
new XElement("State", "WA"),
new XElement("Postal", "68042")
)
),
new XElement("Contact2",
new XElement("Name", "Yoshi Latime"),
new XElement("Phone", "503-555-6874"),
new XElement("Address",
new XElement("Street1", "City Center Plaza 516 Main St."),
new XElement("City", "Elgin"),
new XElement("State", "OR"),
new XElement("Postal", "97827")
)
)
);
// Create the first TextBlock control.
// Note that the element has to declare two XAML namespaces.
XElement textBlock1 = XElement.Parse(
@"<TextBlock
xmlns='http://schemas.microsoft.com/client/2007'
xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'
TextWrapping= 'Wrap'
Width = '400'
Canvas.Top = '10'
Text=''/>");
// Get the first child element from contacts xml tree.
XElement contact1 = contacts.Element("Contact1");
// Set the value of the last attribute "Text"
// to the content of contacts xml tree.
textBlock1.LastAttribute.SetValue(contact1.ToString());
// Get the second child element from contacts xml tree.
XElement contact2 = contacts.Element("Contact2");
// Create the second TextBlock control.
// Note that the element has to declare two XAML namespaces.
XNamespace xmlns = "http://schemas.microsoft.com/client/2007";
XElement textBlock2 = new XElement(xmlns + "TextBlock",
new XAttribute(XNamespace.Xmlns + "x", "http://schemas.microsoft.com/winfx/2006/xaml"),
new XAttribute("Canvas.Top", 250),
new XAttribute("Width", "600"),
new XAttribute("Text", contact2.ToString())
);
// Add TextBlock control to the page
LayoutRoot.Children.Add(XamlReader.Load(textBlock1.ToString()) as UIElement);
// Add TextBlock control to the page
LayoutRoot.Children.Add(XamlReader.Load(textBlock2.ToString()) as UIElement);
}
}
}
LINQ to XML 从任意 URI 位置加载 XML
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.Windows.Markup;
using System.Xml;
using System.Xml.Linq;
using System.IO;
using System.Text;
namespace SilverlightApplication7
{
public partial class Page : UserControl
{
public Page()
{
InitializeComponent();
WebClient wc = new WebClient();
wc.OpenReadCompleted += wc_OpenReadCompleted;
wc.OpenReadAsync(new Uri("http://localhost/GetXML.aspx"));
}
private void wc_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)
{
if (e.Error != null)
{
OutputTextBlock.Text = e.Error.Message;
return;
}
using (Stream s = e.Result)
{
XDocument doc = XDocument.Load(s);
OutputTextBlock.Text = doc.ToString(SaveOptions.OmitDuplicateNamespaces);
}
}
}
}
LINQ to XML 保存到本地
XDocument doc = new XDocument(
new XComment("This is a comment"),
new XElement("Root",
new XElement("Child1", "data1"),
new XElement("Child2", "data2")
)
);
using (IsolatedStorageFile isoStore = IsolatedStorageFile.GetUserStoreForApplication())
{
using (IsolatedStorageFileStream isoStream =
new IsolatedStorageFileStream("myFile.xml", FileMode.Create, isoStore))
{
doc.Save(isoStream);
}
}
using (IsolatedStorageFile isoStore = IsolatedStorageFile.GetUserStoreForApplication())
{
using (IsolatedStorageFileStream isoStream = new IsolatedStorageFileStream("myFile.xml", FileMode.Open, isoStore))
{
XDocument doc1 = XDocument.Load(isoStream);
OutputTextBlock.Text = doc1.ToString();
}
}
从 XAP 包加载文件
创建 book.xml 文件，然后将其添加到您的项目中。这样还会将它添加到应用程序的 XAP 包中。确保将 book.xml 文件的 Build Action 属性设置为 Content.
<?xml version="1.0" encoding="utf-8" ?>
<bookstore>
<book genre='novel' ISBN='10-861003-324'>
<title>The Handmaid's Tale</title>
<price>19.95</price>
</book>
<book genre='novel' ISBN='1-861001-57-5'>
<title>Pride And Prejudice</title>
<price>24.95</price>
</book>
</bookstore>
自应用程序的 XAP 文件加载 XML 文件。然后使用 ReadInnerXml 和 ReadOuterXml 方法读取元素内容。
StringBuilder output = new StringBuilder();
// XmlXapResolver is the default resolver.
using (XmlReader reader = XmlReader.Create("book.xml"))
{
// Moves the reader to the root element.
reader.MoveToContent();
reader.ReadToFollowing("book");
// Note that ReadInnerXml only returns the markup of the node's children
// so the book's attributes are not returned.
output.AppendLine("Read the first book using ReadInnerXml...");
output.AppendLine(reader.ReadInnerXml());
reader.ReadToFollowing("book");
// ReadOuterXml returns the markup for the current node and its children
// so the book's attributes are also returned.
output.AppendLine("Read the second book using ReadOuterXml...");
output.AppendLine(reader.ReadOuterXml());
}
OutputTextBlock.Text = output.ToString();