C# 操作xml(简单问题，很着急) 在线等

Question

我要写个计数器把数字存放在一个xml里面就存一个数就可以我现在写的：                    XmlDocument intcount = new XmlDocument();
                    intcount.Load(path);                    XmlNode XN = intcount.CreateElement("count");
                    XN.InnerText = "0";
                    string countmum = XN.InnerText;
             if (ifadd == "yes")
                    {
                        XN.InnerText = "11";
                    }
                    else
                    {
                        XN.InnerText = "22";
                    }
                    intcount.Save(path);
                    return true;可是总是报错Root element is missing大家帮忙，谢谢

Answer 1

XML文档一定要有一个根节点,你这样添加节点法还有视根节点的存在吗?

Answer 2

把你所有代码都发上来看看啊，，看提示应该是你那个xml文件是空的，，你把第二行先改成
intcount.LoadXml("<root>"+
"</root>");后面两行改成
intcount.DocumentElement.AppendChild(XN);
intcount.Save(path);
试试

Answer 3

using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Xml;
using System.Data;
using System.Web;namespace count
{
    public class Class1
    {
        public string countread(ref string Err,string path)
        {
            
            try
            {
                int i = 0;
                if (File.Exists(path) == false)
                {
                    File.Create(path);
                    XmlDocument intcount = new XmlDocument();
                    XmlNode XN = intcount.CreateElement("count");
                    intcount.AppendChild(XN);
                    intcount.Load(path);
                    
                    XN.InnerText = (i + 1).ToString();
                    intcount.Save(path);
                    return XN.InnerText;
                }
                else
                {
                    XmlDocument intcount = new XmlDocument();
                    XmlNode XN = intcount.CreateElement("count");
                    intcount.AppendChild(XN);
                    intcount.Load(path);
                    
                    XN.InnerText = (i + 1).ToString();
                    intcount.Save(path);
                    return XN.InnerText;
                }
            }
            catch (System.Exception E)
            {
                Err = Err + E;
                return Err;
            }
        }        public bool countwrite(string ifadd, ref string Err, string path)
        {
            try
            {
                if (File.Exists(path) == false)
                {
                    File.Create(path);
                    return true;
                }
                else
                {
                    
                    XmlDocument intcount = new XmlDocument();
                    XmlNode XN = intcount.CreateElement("count");
                    intcount.AppendChild(XN);
                    intcount.Load(path);
                    
                    XN.InnerText = "0";
                    string countmum = XN.InnerText;                    if (ifadd == "yes")
                    {
                        XN.InnerText = Convert.ToString((Convert.ToInt32(countmum) + 1));
                        //XN.InnerText = "1234124141";
                    }
                    else
                    {
                        XN.InnerText = Convert.ToString((Convert.ToInt32(countmum) + 1));
                    }
                    intcount.Save(path);
                    return true;
                }
            }
            catch (System.Exception E)
            {
                Err = Err + E;
                return false;
            }
        }
    }
}

Answer 4

Do you use it as website counter?
How about using web.config?

Answer 5

yes, as a counter.what`s the matter with web.congif?

Answer 6

自己搞定了，谢谢大家，公布一下代码，初试xml，不足的望大家指点函数名字起的基本就是功能的意义，因为很简单就不写注释了^^using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Xml;
using System.Data;
using System.Web;namespace count
{
    public class Class1
    {
        public string countread(ref string Err,string path)
        {
            
            try
            {
                int i = 0;
                if (File.Exists(path) == false)
                {
                    BuildXml(ref Err,path);
                    return i.ToString();
                }
                else
                {
                    XmlDocument intcount = new XmlDocument();
                    intcount.Load(path);
                    XmlNode xnn = intcount.SelectSingleNode("count");
                    i =Int32.Parse(xnn.InnerText.ToString().Trim());
                    intcount.Save(path);
                    return i.ToString();
                }
            }
            catch (System.Exception E)
            {
                Err = Err + E;
                return Err;
            }
        }        public bool countwrite(string ifadd, ref string Err, string path)
        {
            try
            {
                if (File.Exists(path) == false)
                {
                    BuildXml(ref Err,path);
                    return true;
                }
                else
                {
                    XmlDocument intcount = new XmlDocument();
                    intcount.Load(path);
                    XmlNode XN = intcount.DocumentElement;
                    
                    string countmum = XN.InnerText;                    if (ifadd == "yes")
                    {
                        XN.InnerText = Convert.ToString((Convert.ToInt32(countmum) + 1));
                    }
                    else
                    {
                        XN.InnerText = Convert.ToString(Convert.ToInt32(countmum));
                    }
                    intcount.Save(path);
                    return true;
                }
            }
            catch (System.Exception E)
            {
                Err = Err + E;
                return false;
            }
        }        private bool BuildXml(ref string Err, string path)
        {
            try
            {
                XmlDocument xd = new XmlDocument();
                XmlTextWriter xw = new XmlTextWriter(path, UTF8Encoding.UTF8);
                xw.WriteStartDocument();
                xw.WriteStartElement("count");
                xw.WriteString("0");
                xw.WriteEndElement();
                xw.WriteEndDocument();
                xw.Close();
                return true;
                
            }
            catch (System.Exception E)
            {
                Err = Err + E;
                return false;
            }
        }   
    
    }
}