c# 中怎么把信息写入xml文件

[rysmissyou]

<name>123</name>
<age>123</age>

怎么写一个上边那样的xml文件，要求xml是自动生成的以前没有

[rysmissyou]

急......

[liumj2001]

XmlNode xNode;
xNode = xdoc.DocumentElement;
XmlNodeList xnl;
XmlElement xn;
foreach (XmlNode cNode in xNode.ChildNodes)
{
//更改连接
if (cNode.Name == "DataSources")
{
foreach (XmlNode dNode in cNode.ChildNodes)
{
xn = (XmlElement)dNode;
if (xn.GetAttribute("Name") == "DS1")
{
xnl = xn.ChildNodes;
foreach (XmlNode qNode in xnl)
{
if (qNode.Name == "ConnectionProperties")
{
foreach (XmlNode sNode in qNode.ChildNodes)
{
if (sNode.Name == "ConnectString")
{
sNode.InnerText = connstr;
break;
}
}
}
}
}
}
}

[gomoku]

:)

string name = 123;
int age = 123;

string xmlSnippet = string.Format(
    CultureInfo.InvariantCulture,
    "<name>{0}</namd><age>{1}</age>",
    name, age);

[rysmissyou]

 // 创建XmlTextWriter类的实例对象
                    XmlTextWriter textWriter = new XmlTextWriter("login.xml",null);
                    textWriter.Formatting = Formatting.Indented;
                    // 开始写过程，调用WriteStartDocument方法
                    textWriter.WriteStartDocument();
                    //创建一个节点
                    textWriter.WriteStartElement("user");
                    textWriter.WriteElementString("name", "123");
                    textWriter.WriteElementString("age", "456");
                    textWriter.WriteEndElement();
                    // 写文档结束，调用WriteEndDocument方法
                    textWriter.WriteEndDocument();

                    // 关闭textWriter
                    textWriter.Close();

我这样写行吗？为什么执行了，没有创建这个文件那？

[deknight]

[Quote=引用 4 楼 rysmissyou 的回复:]
C# code
// 创建XmlTextWriter类的实例对象
XmlTextWriter textWriter = new XmlTextWriter("login.xml",null);
textWriter.Formatting = Formatting.Indented;
……
[/Quote]
...你不save当然不会有...
textWriter.save()

[wuyq11]

XmlWriterSettings settings = new XmlWriterSettings();
settings.OmitXmlDeclaration = true;
XmlWriter writer = XmlWriter.Create(@"c:\my.xml",settings);
writer.WriteStartDocument();
writer.WriteStartElement("");
writer.WriteEndElement();

[wuyq11]

XmlDocument xmldoc = new XmlDocument();
XmlNode xmlnode = xmldoc.CreateXmlDeclaration("1.0", "gb2312", null);
xmldoc.AppendChild(xmlnode);

xmldoc.Save(Server.MapPath("a.xml"));


XmlDocument xmldoc = new XmlDocument();
xmldoc.LoadXml("<?xml version='1.0' encoding='gb2312'?>...");
xmldoc.Save(Server.MapPath("a.xml")); //保存

[一克代码]

给你一个xml操作类：

using System;
using System.Data;
using System.Configuration;
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;
using System.Collections.Generic;

namespace NetView.Models
{
   
    /// <summary>
    /// XmlHelper 的摘要说明
    /// </summary>
    public class XmlHelper
    {
        private string msg;
        public XmlHelper()
        {
        }

        /// <summary>
        /// 读取数据
        /// </summary>
        /// <param name="path">路径</param>
        /// <param name="node">节点</param>
        /// <param name="attribute">属性名，非空时返回该属性值，否则返回串联值</param>
        /// <returns>string</returns>
        /**************************************************
         * 使用示列:
         * XmlHelper.Read(path, "/Node", "")
         * XmlHelper.Read(path, "/Node/Element[@Attribute='Name']", "Attribute")
         ************************************************/
        public static string Read(string path, string node, string attribute)
        {
            string value = "";
            try
            {
                XmlDocument doc = new XmlDocument();
                doc.Load(path);
                XmlNode xn = doc.SelectSingleNode(node);
                value = (attribute.Equals("") ? xn.InnerText : xn.Attributes[attribute].Value);
            }
            catch { }
            return value;
        }


       

        /// <summary>
        /// 插入
        /// </summary>
        /// <param name="path"></param>
        /// <param name="node"></param>
        /// <param name="node1"></param>
        /// <param name="element"></param>
        /// <param name="attribute"></param>
        /// <param name="value"></param>
        public static void Insert(string path, string node, string node1, string element, string attribute, string value, string attribute1, string value1)
        {
            try
            {
                XmlDocument doc = new XmlDocument();
                doc.Load(path);
                XmlNode xn = doc.SelectSingleNode(node); //查找根node节点
                XmlElement xel = doc.CreateElement(node1);
                
                XmlElement xe = doc.CreateElement(element);
                if (attribute.Equals(""))
                    xe.InnerText = value;
                else
                    xe.SetAttribute(attribute, value);
                xe.SetAttribute(attribute1, value1);
                xel.AppendChild(xe);
                xn.AppendChild(xel);
                //}
                doc.Save(path);

            }
            catch { }
        }
        /// <summary>
        /// 插入数据
        /// </summary>
        /// <param name="path">路径</param>
        /// <param name="node">节点</param>
        /// <param name="element">元素名，非空时插入新元素，否则在该元素中插入属性</param>
        /// <param name="attribute">属性名，非空时插入该元素属性值，否则插入元素值</param>
        /// <param name="value">值</param>
        /// <returns></returns>
        /**************************************************
         * 使用示列:
         * XmlHelper.Insert(path, "/Node", "Element", "", "Value")
         * XmlHelper.Insert(path, "/Node", "Element", "Attribute", "Value")
         * XmlHelper.Insert(path, "/Node", "", "Attribute", "Value")
         ************************************************/
        public static void Insert(string path, string node, string element, string attribute, string value)
        {
            try
            {
                XmlDocument doc = new XmlDocument();
                doc.Load(path);
                XmlNode xn = doc.SelectSingleNode(node);
                if (element.Equals(""))
                {
                    if (!attribute.Equals(""))
                    {
                        XmlElement xe = (XmlElement)xn;
                        xe.SetAttribute(attribute, value);
                    }
                }
                else
                {
                    XmlElement xe = doc.CreateElement(element);
                    if (attribute.Equals(""))
                        xe.InnerText = value;
                    else
                        xe.SetAttribute(attribute, value);
                    xn.AppendChild(xe);
                }
                doc.Save(path);
            }
            catch { }
        }

        /// <summary>
        /// 修改数据
        /// </summary>
        /// <param name="path">路径</param>
        /// <param name="node">节点</param>
        /// <param name="attribute">属性名，非空时修改该节点属性值，否则修改节点值</param>
        /// <param name="value">值</param>
        /// <returns></returns>
        /**************************************************
         * 使用示列:
         * XmlHelper.Insert(path, "/Node", "", "Value")
         * XmlHelper.Insert(path, "/Node", "Attribute", "Value")
         ************************************************/
        public static void Update(string path, string node, string attribute, string value)
        {
            try
            {
                XmlDocument doc = new XmlDocument();
                doc.Load(path);
                XmlNode xn = doc.SelectSingleNode(node);
                XmlElement xe = (XmlElement)xn;
                if (attribute.Equals(""))
                    xe.InnerText = value;
                else
                    xe.SetAttribute(attribute, value);
                doc.Save(path);
            }
            catch { }
        }

      

[一克代码]

  /// <summary>
        /// 删除数据
        /// </summary>
        /// <param name="path">路径</param>
        /// <param name="node">节点</param>
        /// <param name="attribute">属性名，非空时删除该节点属性值，否则删除节点值</param>
        /// <param name="value">值</param>
        /// <returns></returns>
        /**************************************************
         * 使用示列:
         * XmlHelper.Delete(path, "/Node", "")
         * XmlHelper.Delete(path, "/Node", "Attribute")
         ************************************************/
        public static void Delete(string path, string node, string attribute)
        {
            // XmlDocument doc = new XmlDocument();
            // doc.Load(path);
            // XmlNode xn = doc.SelectSingleNode(node);
            // string mainNode = node.Substring(0, node.LastIndexOf("/"));
            //doc.SelectSingleNode(mainNode).RemoveChild(doc.SelectSingleNode(node));

            try
            {
                XmlDocument doc = new XmlDocument();
                doc.Load(path);
                // XmlNode xn = doc.SelectSingleNode(node);
                XmlNodeList xnl = doc.SelectSingleNode(node).ChildNodes;
                foreach (XmlNode xn in xnl)
                {
                    XmlNodeList xnl1 = xn.SelectSingleNode("RedirectUrl").ChildNodes;
                    XmlElement xe = (XmlElement)xn;
                    for (int j = 0; j < xnl1.Count; j++)
                    {
                        XmlElement xe1 = (XmlElement)xnl1.Item(j);
                        if (xe1.GetAttribute("UrlName") == "小路工作室1231231231")
                        {
                            xn.RemoveChild(xe1);
                            if (j < xnl1.Count) j = j - 1;
                        }
                    }
                  
                }

                doc.Save(path);
            }
            catch { }
        }

        /// <summary>
        /// 删除属性带key的节点,key:GUID
        /// </summary>
        /// <param name="path">XML文件路径</param>
        /// <param name="rootnode">根节点</param>
        /// <param name="key">key:Guid</param>
        /// <param name="msg">返回的信息</param>
        public static void DeleteXMLNode(string path, string rootnode, string znode,string type,string key)
        {
          try
            {
            if (System.IO.File.Exists(path))
            {
                XmlDocument xmlDoc = new XmlDocument();
                xmlDoc.Load(path);
                XmlNodeList xl = xmlDoc.SelectSingleNode(rootnode).ChildNodes;
                for (int i = 0; i < xl.Count; i++)
                {
                    XmlElement xe = (XmlElement)xl[i];//第i个dbGust子节点
                    XmlNodeList node = xe.GetElementsByTagName(znode);
                    if (node.Count > 0)
                    {
                        for (int j = 0; j < node.Count; j++)
                        {
                            XmlNode node1 = node.Item(j);
                            XmlElement xe1 = (XmlElement)node.Item(j);
                            if (xe1.GetAttribute(type) == key)
                            {
                                xmlDoc.SelectSingleNode(rootnode).RemoveChild(node[0].ParentNode);//删除该节点
                                break;
                            }
                        }
                       
                    }
                }
                
                    xmlDoc.Save(path);
                }
          }
                catch (XmlException ex)
                {

                }

            }
            /// <summary>
            /// 返回符合指定名称的节点数
            /// </summary>
            /// <param name="nodeName">节点名</param>
            /// <returns>节点数</returns>
            public static int Count(string path,string nodeName,string znode)
            {
                try
                {
                    XmlDocument xmlDoc = new XmlDocument();
                    xmlDoc.Load(path);
                    XmlElement xe = (XmlElement)xmlDoc.SelectSingleNode(nodeName); //查找根node节点
                    XmlNodeList nodeList = xe.GetElementsByTagName(znode);
                    return nodeList.Count;
                }
                catch (Exception e)
                {
                    throw (new Exception(e.Message));
                }
            }
        /// <summary>
        /// 返回最后的数字
        /// </summary>
        /// <param name="path"></param>
        /// <param name="nodeName"></param>
        /// <param name="znode"></param>
        /// <returns></returns>
        public static string num(string path, string nodeName, string znode,string type)
        {
            try
            {
                XmlDocument xmlDoc = new XmlDocument();
                xmlDoc.Load(path);
                XmlElement xe = (XmlElement)xmlDoc.SelectSingleNode(nodeName); //查找根node节点
                XmlNodeList nodeList = xe.GetElementsByTagName(znode);
                int i = nodeList.Count;
                XmlElement xe1 = (XmlElement)nodeList.Item(nodeList.Count-1);
                string inum=xe1.GetAttribute(type);
                 
                return inum;
            }
            catch (Exception e)
            {
                throw (new Exception(e.Message));
            }
        }
        }
      
    }

[happyer_longlong]

很好 上面的代码

[rysmissyou]

这个问题解决了，谢谢大家
又有个问题xml和上边的一样，我想直接改变name和age的值怎么操作啊！！
谢谢了

[一克代码]

用我给你的类

直接修改就行了 啊 ！

里面有添加

修改
删除

[guohelv0519]

上述代码已经很全面了，彻底模拟了数据库数据操作：增删改查。

[rysmissyou]

问下 修改里的 attribute 是什么的值啊

[mountroste]

XML是什么文件啊

[一克代码]

/// <param name="attribute">属性名，非空时修改该节点属性值，否则修改节点值</param>

[Ryan20082009]

public void TypeObjectToXmlString()
{
string file1 = @"..\Test\Spoke\Manual\Lp\Mstr\Samples\SBAMSTR-Part.TXT";
FileClass d = new FileClass();
d.vendorCode = "Lp";
d.fileCode= "Mstr";
d.file = file1;
try
{
System.Xml.Serialization.XmlSerializer writer =
new System.Xml.Serialization.XmlSerializer(typeof(FileClass));
System.IO.StreamWriter file = new System.IO.StreamWriter(@"D:\FileClass.xml");
writer.Serialize(file, d);
file.Close();
Console.WriteLine("Success!");
}
catch (Exception e)
{
Console.WriteLine(e);
}

}
这个我已经测试成功