基于C#中XmlReader读取Xml的深入分析

using System;
using System.Collections.Generic;
using System.Text;
using System.Xml;
using System.IO;

namespace UseXmlReader
{
    class Program
    {
        static void Main(string[] args)
        {
            //声明StringReader传入Xml文本，作为XmlReader.Create的参数
            using (StringReader strRdr = new StringReader(@"<?xml version=""1.0"" encoding=""utf-8"" ?>
<root>
    <cat color=""white"">I'm a Cat</cat>
    <dog color=""yellow""/>
</root>"))
            {
                //通过XmlReader.Create静态方法创建XmlReader实例
                using (XmlReader rdr = XmlReader.Create(strRdr))
                {
                    //循环Read方法直到文档结束
                    while (rdr.Read())
                    {
                        Console.WriteLine("rdr.NodeType = " + rdr.NodeType);
                        //如果是开始节点
                        if (rdr.NodeType == XmlNodeType.Element) {
                            //通过rdr.Name得到节点名
                            string elementName = rdr.Name;

                            Console.WriteLine(elementName + " element start");
                            if (elementName == "root") {

                            }
                            //读取到cat元素 这时rdr.Read()读取到的内容为<cat color="white">
                            else if (elementName == "cat")
                            {
                                //可以通过中括号获得属性值
                                string colorVal = rdr["color"];
                                Console.WriteLine("\tcat's color is " + colorVal);

                                //读取到节点内文本内容
                                if(rdr.Read()) {
                                    //通过rdr.Value获得文本内容
                                    Console.WriteLine("\t cat said:" + rdr.Value);
                                }
                            }
                        }
                        else if (rdr.NodeType == XmlNodeType.EndElement)
                        {
                            //在节点结束时也可以通过rdr.Name获得节点名字
                            string elementName = rdr.Name;
                            Console.WriteLine(elementName + " element end");
                        }
                    }
                }
            }

            Console.Read();
        }
    }
}
如果觉得代码不明白，下面是一张读取顺序图，标明了读取顺序号和每次读取的内容，如下图所示：