Silverlight读取XML

XMLReader与XMLWriter都没有学会，暂时使用XDocument加Linq读取。

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.Xml.Linq;
using System.Text;
using System.IO;

namespace HCLoad
{
    public partial class UC_Test : UserControl
    {
        public UC_Test()
        {
            InitializeComponent();
        }
        //Linq实体类
        public class project
        {
            public int id { get; set; }
        }
        private void GetXmlFromString()
        {
            string strXml = 
            @"<?xml version=""1.0"" encoding=""utf-16"" ?>
            <projects>
                <project id=""1""></project>
                <project id=""2""></project>
            </projects>";

            TextReader txtReader = new StringReader(strXml);

            XDocument xDoc = XDocument.Load(txtReader);

            var projects = from f in xDoc.Descendants("project")
                           select new project
                           {
                               id = int.Parse(f.Attribute("id").Value)
                           };
            List<project> _projects = new List<project>();
            _projects.AddRange(projects);
            //遍历
            for (int i = 0; i < _projects.Count; i++)
            {
                MessageBox.Show(_projects[i].id.ToString());
            }
        }
        private void Button_Click(object sender, RoutedEventArgs e)
        {
            GetXmlFromString();
        }
    }
}

参考一：Silverlight读取xml

这例子是为我的试验项目"SLShowCase"做的读取xml的试验.看到园子里的朋友做到仿163幻灯片的demo就提前发上来了.
项目的功能是做案例展示.
ok  首先,先定义xml.
projects.xml

<?xml version="1.0" encoding="utf-8" ?>
<projects>
  <project id="1" title="nasa.wang @ cnblogs" category="web" hit="23" createdate="2008-4-9" converpic="null" iscommend="true" votenum="8" score="10">
  </project>
</projects>

在sl中定义类.

    public class project
    {
        public int id { get; set; }
        public string title { get; set; }
        public string category { get; set; }
        public int hit { get; set; }
        public DateTime createdate { get; set; }
        public string converpic { get; set; }
        public bool iscommend { get; set; }
        public int votenum { get; set; }
        public int score { get; set; }
        //public IList<pitem> pitems { get; set; }
        //public IList<pcomment> pcomments { get; set; }
    }

使用WebClient来加载数据.linq来格式化数据.

        public Page()
        {
            InitializeComponent();
            WebClient client = new WebClient();
            client.DownloadStringAsync(new Uri(HtmlPage.Document.DocumentUri, "projects.xml"));
            client.DownloadStringCompleted += new DownloadStringCompletedEventHandler(client_DownloadStringCompleted);
        }

        void client_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
        {
            XmlReader reader = XmlReader.Create(new StringReader(e.Result));
            XDocument document = XDocument.Load(reader);
            var projects = from f in document.Descendants("project")
                           select new project
                           {
                               id = int.Parse(f.Attribute("id").Value),
                               title = f.Attribute("title").Value,
                               category = f.Attribute("category").Value,
                               hit = int.Parse(f.Attribute("hit").Value),
                               createdate = DateTime.Parse(f.Attribute("createdate").Value),
                               converpic = f.Attribute("converpic").Value,
                               iscommend = bool.Parse(f.Attribute("iscommend").Value),
                               votenum = int.Parse(f.Attribute("votenum").Value),
                               score = int.Parse(f.Attribute("score").Value),
                           };
            List<project> _projects = new List<project>();
            _projects.AddRange(projects);
            txtStatus.Text ="read success for " + _projects[0].title;
        }

读取完毕.  ;)

代码下载:https://files.cnblogs.com/nasa/silverlight/readxmlfile.zip

 

参考二：http://msdn.microsoft.com/zh-cn/library/system.io.textreader(VS.80).aspx

using System;
using System.IO;

class TextRW
{
    static void Main()
    {
        TextWriter stringWriter = new StringWriter();
        using(TextWriter streamWriter = 
            new StreamWriter("InvalidPathChars.txt"))
        {
            WriteText(stringWriter);
            WriteText(streamWriter);
        }

        TextReader stringReader = 
            new StringReader(stringWriter.ToString());
        using(TextReader streamReader = 
            new StreamReader("InvalidPathChars.txt"))
        {
            ReadText(stringReader);
            ReadText(streamReader);
        }
    }

    static void WriteText(TextWriter textWriter)
    {
        textWriter.Write("Invalid file path characters are: ");
        textWriter.Write(Path.InvalidPathChars);
        textWriter.Write('.');
    }

    static void ReadText(TextReader textReader)
    {
        Console.WriteLine("From {0} - {1}", 
            textReader.GetType().Name, textReader.ReadToEnd());
    }
}

参考三：http://blog.csdn.net/dotfun/archive/2009/11/19/4829349.aspx
Silverlight 2使用C#遍历XML(兼容Silverlight3)

在Silverlight 1.1中，C#只能用XmlReader这样一个非常轻量级的东西来解析XML，因此稍有不慎就会出现很多非常奇怪的错误，在这里对XML的解析做一个简单的流程介绍吧。

在对流式XML的解析中，XmlReader对XML节点进行一些区分，这些节点的类型包括：

引用内容：
public enum XmlNodeType
{
    None = 0,
    Element = 1,
    Attribute = 2,
    Text = 3,
    CDATA = 4,
    EntityReference = 5,
    Entity = 6,
    ProcessingInstruction = 7,
    Comment = 8,
    Document = 9,
    DocumentType = 10,
    DocumentFragment = 11,
    Notation = 12,
    Whitespace = 13,
    SignificantWhitespace = 14,
    EndElement = 15,
    EndEntity = 16,
    XmlDeclaration = 17,
}

其中常用到的有Element、Attribite、Text、CDATA、EndElement等。其中Element类型的节点为“”形式，EndElement的的节点为“”形式，而Text类型则可以为一对标记之间的文本内容或者节点之间的空格、换行等。

了解了这些，我们再来看怎么从一个XML文件流中找出自己想要的数据。首先假设有一个这样的XML数据流，其XML结构如下：

引用内容：

 
   
    热门动漫
    OOboy.net
   
    Thu, 16 Aug 2007 09:39:19 GMT
 
 
   
    海外剧场
    OOboy.net
   
    Thu, 16 Aug 2007 09:39:19 GMT
 

我们用XmlReader的Create方法从这个Stream中创建了一个XmlReader对象，现在我们解析出想要的数据——item项目中的各个子项：Title、Catalog、Author、Email、Modified。

解析过程在下面代码的注释中：

引用内容：
//reader是一个XmlReader实例
//开始读取流，直到读完为止
//reader.Read()每次读取一个XML节点（XML节点的描述在本文开头）
while (reader.Read())
{
    //如果该节点是一个开始节点，而且节点的名称叫做item
    //那么我们继续读取item子树
    if ((reader.IsStartElement()) && (reader.LocalName == "item"))
    {
        //创建一个新的Item对象，后面把数据保存到Item对象中
        Item item = new Item();

        //继续读取Item下面的内容
        using (XmlReader itemReader = reader.ReadSubtree())
        {
            //开始读取Item下面的内容，知道读完Item子树为止
            //当碰到节点时会跳出循环
            while (itemReader.Read())
            {
                //如果找到一个Element，我们就读取其中的值
                //用这种节点可以忽略空格、回车等等
                if (itemReader.NodeType == XmlNodeType.Element)
                {
                    //如果是空节点，比如上文中的这样的节点
                    //此时读取下一个节点，否则会出错
                    if (itemReader.IsEmptyElement)
                    {
                        continue;
                    }

                    //如果不是空节点
                    //把节点的name记录下来
                    string nodeName = itemReader.Name;

                    //读取节点内地文本节点
                    itemReader.Read();
                    if (itemReader.NodeType == XmlNodeType.Text)
                    {
                        //根据节点的name，把值保存到Item对应的属性中
                        switch (nodeName.ToUpper())
                        {
                            case "TITLE":
                                item.title = itemReader.Value;
                                break;
                            case "CATALOG":
                                item.catalog = itemReader.Value;
                                break;
                            case "AUTHOR":
                                item.author = itemReader.Value;
                                break;
                            case "EMAIL":
                                item.email = itemReader.Value;
                                break;
                            case "MODIFIED":
                                item.modified = itemReader.Value;
                                break;
                        }
                    }
                    //读取完成，再读结束节点End Element
                    itemReader.Read();
                }
            }
        }
    }
}