如何使用 XmlReader 分析 XML
Silverlight
本主题提供两个如何使用 XmlReader 来分析 Microsoft .NET Framework for Silverlight 中的 XML 流的示例。
有关如何使用 XmlReader 分析 XML 的更多示例，请参见 .NET Framework 文档中的以下主题：
Current Node Position in XmlReader（XmlReader 中的当前节点位置）
Reading Elements（读取元素）
Reading Attributes（读取属性）
Reading Content（读取内容）
配置 Silverlight Visual Studio 项目以运行此示例
1.
修改 page.xaml 文件，使它包含下面的 TextBlock 元素：
复制
<TextBlock x:Name ="OutputTextBlock" Canvas.Top ="10" TextWrapping="Wrap"/>
2.
在应用程序的 page.xaml.cs（在 Visual Basic 中为 page.xaml.vb）源文件中，添加下面的 using 语句（在 Visual Basic 中为 Imports）：
using System.Xml;
using System.IO;
using System.Text;
示例
--------------------------------------------------------------------------------
下面的示例在流中导航以确定当前节点类型，然后使用 XmlWriter 输出 XmlReader 内容
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();
下面的示例使用 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();
一段代码：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Xml;
namespace XMLReader
{
public class XMLReader
{
User user = null;
UserCredit credit = null;
public string ReaderAttribute(string name)
{
string contents = null;
using (XmlReader reader = XmlReader.Create(name))
{
if (reader.HasAttributes)
{
switch (reader.NodeType)
{
case XmlNodeType.Element: contents+=(reader.Name); break;
case XmlNodeType.Text:contents+=":" + reader.Value + ";"; break;
}
}
}
return contents;
}
public string ReadXml(string xml)
{
StringBuilder builder = new StringBuilder();
using (XmlReader reader = XmlReader.Create(new StringReader(xml)))
{
while (reader.Read())
{
if (reader.HasValue)//这样把没值的数据屏蔽，如User
{
switch (reader.NodeType)
{
case XmlNodeType.Element: builder.Append(reader.Name); break;
case XmlNodeType.Text: builder.Append("=" + reader.Value + ";"); break;
}
}
}
}
return builder.ToString();
}
public IDictionary<string, string> GetDic(string content)
{
IDictionary<string, string> dit = new Dictionary<string, string>();
string[] arrays = content.Split(';');
foreach (string item in arrays)
{
string[] param = item.Split('=');
if (!string.IsNullOrEmpty(param[0]) && !string.IsNullOrEmpty (param[1]))//注意：必须key值和Value值都存在才可加入
{
dit.Add(param[0], param[1]);
}
}
return dit;
}
public User GetUser(IDictionary<string, string> dit)
{
user = new User();
credit = new UserCredit();
IEnumerator<KeyValuePair<string, string>> dem = dit.GetEnumerator();
while (dem.MoveNext())
{
string name = dem.Current.Key;
string value = dem.Current.Value;
switch (name)
{
case "user_id": user.UserId = Convert.ToInt64(value); break;
case "type": user.Type = value; break;
case "sex": user.Sex = value; break;
case "nick": user.Nick = value; break;
case "created": user.Created = value; break;
case "total_num": credit.TotalNum = Convert.ToInt64(value); break;
case "score": credit.Score = Convert.ToInt64(value); break;
default: break;
}
}
return user;
}
public User GETUser(IDictionary<string, string> dit)
{
user = new User();
credit = new UserCredit();
Dictionary<string, string> dic = new Dictionary<string, string>(dit.Count);
foreach (KeyValuePair<string, string> kvp in dic)
{
string name = kvp.Key;
switch (name)
{
case "type": user.Type = kvp.Value ; break;
case "sex": user.Sex = kvp.Value; break;
case "nick": user.Nick = kvp.Value; break;
case "created": user.Created =kvp.Value; break;
default: break;
}
}
return user;
}
public string Test(IDictionary<string, string> dit)
{
string KV = null;
Dictionary<string, string> dic = new Dictionary<string, string>(dit.Count);
foreach (var item in dic)//注意：值为空的情况
{
KV +="键："+ item.Key + "值："+item.Value;
}
//foreach (var value in dic.Values)
//{
// KV += "值的集合：" + value;
//}
return KV;
}
}
}