Question

c#中xmlreader是怎么读数据的

Answer 1

看下面的例子

usingSystem;
usingSystem.Collections.Generic;
usingSystem.Linq;
usingSystem.Text;
usingSystem.Xml;
usingSystem.IO;
 
namespacetryXmlreader
{
 
   class Program
   {
       static voidMain(string[] args)
       {
            //CreateByFile();
            //CreateByFileStream();
            //ReadElementContentAs();
            ReadAttribute();
           //Console.ReadLine();
       }
 
       public staticvoid CreateByFile()
       {
           //创建XML读取器，读取XML文件
            XmlReaderreader = XmlReader.Create(@"e:\1.xml");
            Console.WriteLine("All Text in books.xml:\n");
            while(reader.Read())
            {
                if(reader.NodeType == XmlNodeType.Text)
                {
                    Console.WriteLine(reader.Value);
                }
            }
            reader.Close();
       }
 
       public staticvoid CreateByFileStream()
       {
            FileStreamfs = new FileStream(@"e:\1.xml", FileMode.Open);
            //创建XML读取器，读取XML文件流
            XmlReaderreader = XmlReader.Create(fs);
            Console.WriteLine("\nAll title in books.xml:\n");
 
            //循环查找节点，直到最后一个节点
            while(!reader.EOF)
            {
                if(reader.MoveToContent() == XmlNodeType.Element&& reader.Name == "title")
                {
                    //打印节点类型为Element，名称为title的节点值
                   DisplayElementString(reader);
                }
                else
                {
                   reader.Read();
                }
           }
            
            reader.Close();
            fs.Close();
       }
 
       public staticvoid DisplayElementString(XmlReader reader)
       {            try
            {
                Console.WriteLine(reader.ReadElementString());
            }
            //捕捉不包含文本内容的元素抛出的异常
            catch(XmlException e)
            { 
                 
            }
       }
 
       publicstatic voidReadElementContentAs()
       {
            XmlReaderreader = XmlReader.Create(@"e:\1.xml");
           Console.WriteLine("\nAfter update price * 0.8:\n");
            while(reader.Read())
            {
                if(reader.NodeType == XmlNodeType.Element)
               {
                    if(reader.Name == "price")
                    {
                        //将price元素值读取为decimal类型
                        decimal price = reader.ReadElementContentAsDecimal();
                        price = price * 0.8m;
                        Console.WriteLine("New Price ={0}", price);
                    }
                    elseif (reader.Name == "title")
                    {
                        //将title元素值读取为string类型
                        Console.WriteLine(reader.ReadElementContentAsString());
                    }
                }
            }
            reader.Close();
       }
 
       public staticvoid ReadAttribute()
       {
            XmlReaderreader = XmlReader.Create(@"e:\1.xml");
            Console.WriteLine("\nAttribute:\n");
            while(reader.Read())
            {
                if(reader.NodeType == XmlNodeType.Element)
                {
                    for(int i = 0; i < reader.AttributeCount; i++)//迭代其所有属性
                    {
                        Console.WriteLine(reader.GetAttribute(i));
                    }
                }
            }
            reader.Close();
      }
   }
}