xml节点取值问题...

2009-04-14 08:20:42 173 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

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有这样一个xml文件



  <?xml version="1.0" encoding="big5" ?> 

- <LINEUP>

  <TEAM_INFO HOME_ID="4" GAME_TIME="2009/04/13 19:15"/> 

- <PLAYER_LIST>

    <PLAYER PLAYER_NAME="C罗" PLAYER_NUMBER="12" POSITION="前锋" STATUS_ID="0" /> 

    <PLAYER PLAYER_NAME="贝壳汉姆" POSITION="中场" STATUS_ID="0" /> 

    <PLAYER PLAYER_NAME="李玮峰" PLAYER_NUMBER="25" POSITION="门" STATUS_ID="0" /> 

  </PLAYER_LIST>

  </LINEUP>

在节点PLAYER_LIST下面，有的有PLAYER_NUMBER属性，有的没有PLAYER_NUMBER属性

在循环读取这个xml文档的时候（PLAYER_LIST 下的），我是定义了4个变量分别保存PLAYER_LIST， PLAYER_NUMBER，POSITION，STATUS_ID
当读到第二个PLAYER 的时候 <PLAYER PLAYER_NAME="贝壳汉姆" POSITION="中场" STATUS_ID="0" />

应为他没有PLAYER_NUMBER属性，那我怎么判断这一行没有PLAYER_NUMBER属性，并给此PLAYER_NUMBER默认赋值为0；

这一步是怎么判断并且默认赋值PLAYER_NUMBER为0？？？
在线等...

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szldk 2009-04-15

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lonelySurvive 2009-04-15

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using System;

using System.Data;

using System.Configuration;

using System.Collections;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Web.UI.HtmlControls;

using System.Xml;



public partial class _Default : System.Web.UI.Page

{

    protected void Page_Load(object sender, EventArgs e)

    {

        XmlDocument xd = new XmlDocument();

        xd.Load(Request.PhysicalApplicationPath + "Books.xml");



        XmlNodeList xnl = xd.GetElementsByTagName("PLAYER");

        foreach (XmlElement xe in xnl)

        {

            if (xe.Attributes["PLAYER_NUMBER"] != null)

            {

                Response.Write(xe.Attributes["PLAYER_NUMBER"].Value + "<br/>");

            }

            else

            {

                XmlAttribute xa = xd.CreateAttribute(null, "PLAYER_NUMBER", null);

                xa.Value = "0";

                xe.Attributes.Append(xa);

            }

        }

        xd.Save(Server.MapPath("Books.xml"));

        



        //Response.Write(xd.OuterXml);

    }

}

lonelySurvive 2009-04-14

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要断电了，不好意思，第2个问题的代码还给你写出来
第2个问题的大概思路就是用 XmlDocument来做，第1个用XmlReader



using System;

using System.Data;

using System.Configuration;

using System.Collections;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Web.UI.HtmlControls;

using System.IO;

using System.Xml;



public partial class _Default : System.Web.UI.Page

{

    protected void Page_Load(object sender, EventArgs e)

    {

        int bookcount = 0;

        XmlReaderSettings settings = new XmlReaderSettings();



        settings.IgnoreWhitespace = true;

        settings.IgnoreComments = true;



        //我们不是创建XmlReader类的的具体实现代码，而是创建XmlReaderSettings类的一个实力

        //，把它传给Create方法，用XmlReaderSettings类为XmlReader对象指定需要的供能

        string booksFile = Path.Combine(Request.PhysicalApplicationPath, "Books.xml");

        using (XmlReader reader = XmlReader.Create(booksFile, settings))

        {

            while (reader.Read())//如果成功读取了节点，就返回True，当节点都读取完了，它就返回false

            {

                if (reader.NodeType == XmlNodeType.Element && reader.HasAttributes)

                {

                    if (reader["PLAYER_NUMBER"] != null)

                    {

                        Response.Write(reader["PLAYER_NUMBER"].ToString()+"   ");

                    }

                    //Response.Write(reader.GetAttribute("PLAYER_NUMBER")+"<br/>");

                    //bookcount++;

                }

            }

        }

        //Response.Write(String.Format("Found {0} books!", bookcount));

    }



}

ayymbirst 2009-04-14

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你好，可参考如下思路,如存在问题可联系我.
using System;
using System.Collections.Generic;
using System.Text;

namespace xmlReader
{
class Program
{
static void Main(string[] args)
{
//生成XML
string str = "<?xml version=\"1.0\" encoding=\"utf-8\" ?> " + System.Environment.NewLine
+ " <LINEUP>" + System.Environment.NewLine
+" <TEAM_INFO HOME_ID=\"4\" GAME_TIME=\"2009/04/13 19:15\"/> " + System.Environment.NewLine
+"<PLAYER_LIST>" + System.Environment.NewLine
+" <PLAYER PLAYER_NAME=\"C罗\" PLAYER_NUMBER=\"12\" POSITION=\"前锋\" STATUS_ID=\"0\" /> " + System.Environment.NewLine
+"<PLAYER PLAYER_NAME=\"贝壳汉姆\" POSITION=\"中场\" STATUS_ID=\"0\" /> " + System.Environment.NewLine
+"<PLAYER PLAYER_NAME=\"李玮峰\" PLAYER_NUMBER=\"25\" POSITION=\"门\" STATUS_ID=\"0\" /> " + System.Environment.NewLine
+"</PLAYER_LIST>" + System.Environment.NewLine
+ "</LINEUP>";

System.IO.FileStream fs = new System.IO.FileStream("dat.xml", System.IO.FileMode.OpenOrCreate);
byte [] byt = Encoding.UTF8.GetBytes(str) ;
fs.Write(byt, 0, byt.Length);
fs.Flush();
fs.Dispose();

//读取XML
print(GetList("dat.xml"));
}

//输出
static void print(List<date > list)
{
foreach (date dat in list)
{
Console.WriteLine("PLAYER_NAME:{0} , PLAYER_NUMBER:{1} , POSITION:{2} , STATUS_ID:{3}", dat.PLAYER_NAME, dat.PLAYER_NUMBER, dat.POSITION, dat.STATUS_ID);
}
}

//读取数据
static List<date> GetList(string path)
{
List<date> list = new List<date>();
System.Xml.XmlReader reader = System.Xml.XmlReader.Create(path);
while (reader.Read())
{
switch (reader.NodeType)
{
case System.Xml.XmlNodeType .Element:
if (reader.Name.ToLower() == "PLAYER".ToLower())
{
date dat = new date();
while (reader.MoveToNextAttribute())
{
System.Reflection.PropertyInfo pro = dat.GetType().GetProperty(reader.Name);
if (pro.PropertyType == typeof(string))
pro.SetValue(dat, reader.Value, null);
else
pro.SetValue(dat, int.Parse(reader.Value), null);
}
list.Add(dat);
}
break;
}
}
return list;
}

//球员信息数据实体类
public class date
{
string PLAYER_NAME_;
int PLAYER_NUMBER_ = 0;
string POSITION_;
int STATUS_ID_;

public string PLAYER_NAME
{
get { return PLAYER_NAME_; }
set { PLAYER_NAME_ = value; }
}
public int PLAYER_NUMBER
{
get { return PLAYER_NUMBER_; }
set { PLAYER_NUMBER_ = value; }
}
public string POSITION
{
get { return POSITION_; }
set { POSITION_ = value; }
}

public int STATUS_ID
{
get { return STATUS_ID_; }
set { STATUS_ID_ = value; }
}
}
}
}

evjen 2009-04-14