xml的操作
XmlDocument xmldoc;
XmlElement xmlelem;
/// <summary>
/// 创建一个带内容的xml文件
/// </summary>
public void CreateXml()
{
xmldoc = new XmlDocument();
//加入XML的声明段落,<?xml version="1.0" encoding="gb2312"?>
XmlDeclaration xmldecl;
xmldecl = xmldoc.CreateXmlDeclaration("1.0", "UTF-8", null);
xmldoc.AppendChild(xmldecl);
//加入一个根元素
xmlelem = xmldoc.CreateElement("", "Employees", "");
xmldoc.AppendChild(xmlelem);
//加入另外一个元素
for (int i = 1; i < 3; i++)
{
XmlNode root = xmldoc.SelectSingleNode("Employees");//查找<Employees>
XmlElement xe1 = xmldoc.CreateElement("Node");//创建一个<Node>节点
xe1.SetAttribute("genre", "DouCube");//设置该节点genre属性
xe1.SetAttribute("ISBN", "2-3631-4");//设置该节点ISBN属性
XmlElement xesub1 = xmldoc.CreateElement("title");
xesub1.InnerText = "CS从入门到精通";//设置文本节点
xe1.AppendChild(xesub1);//添加到<Node>节点中
XmlElement xesub2 = xmldoc.CreateElement("author");
xesub2.InnerText = "候捷";
xe1.AppendChild(xesub2);
XmlElement xesub3 = xmldoc.CreateElement("price");
xesub3.InnerText = "58.3";
xe1.AppendChild(xesub3);
root.AppendChild(xe1);//添加到<Employees>节点中
}
//保存创建好的XML文档
xmldoc.Save(Server.MapPath("/data.xml"));
}
/// <summary>
/// 添加一个节点
/// </summary>
public void addNode()
{
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(Server.MapPath("data.xml"));
XmlNode root = xmlDoc.SelectSingleNode("Employees");//查找<Employees>
XmlElement xe1 = xmlDoc.CreateElement("Node");//创建一个<Node>节点
xe1.SetAttribute("genre", "张三");//设置该节点genre属性
xe1.SetAttribute("ISBN", "1-1111-1");//设置该节点ISBN属性
XmlElement xesub1 = xmlDoc.CreateElement("title");
xesub1.InnerText = "C#入门帮助";//设置文本节点
xe1.AppendChild(xesub1);//添加到<Node>节点中
XmlElement xesub2 = xmlDoc.CreateElement("author");
xesub2.InnerText = "高手";
xe1.AppendChild(xesub2);
XmlElement xesub3 = xmlDoc.CreateElement("price");
xesub3.InnerText = "158.3";
xe1.AppendChild(xesub3);
root.AppendChild(xe1);//添加到<Employees>节点中
xmlDoc.Save(Server.MapPath("/data.xml"));
}
/// <summary>
/// 修改节点的值（属性和子结点）；
/// </summary>
public void UdpateNode()
{
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(Server.MapPath("data.xml"));
XmlNodeList nodeList = xmlDoc.SelectSingleNode("Employees").ChildNodes;//获取Employees节点的所有子节点
foreach (XmlNode xn in nodeList)//遍历所有子节点
{
XmlElement xe = (XmlElement)xn;//将子节点类型转换为XmlElement类型
if (xe.GetAttribute("genre") == "张三")//如果genre属性值为“张三”
{
xe.SetAttribute("genre", "update张三");//则修改该属性为“update张三”
XmlNodeList nls = xe.ChildNodes;//继续获取xe子节点的所有子节点
foreach (XmlNode xn1 in nls)//遍历
{
XmlElement xe2 = (XmlElement)xn1;//转换类型
if (xe2.Name == "author")//如果找到
{
xe2.InnerText = "亚胜";//则修改
}
}
}
}
xmlDoc.Save(Server.MapPath("data.xml"));//保存。
}
/// <summary>
/// 修改节点（添加结点的属性和添加结点的自结点）；
/// </summary>
public void UdpateNodeAttribute()
{
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(Server.MapPath("data.xml"));
XmlNodeList nodeList = xmlDoc.SelectSingleNode("Employees").ChildNodes;//获取Employees节点的所有子节点
foreach (XmlNode xn in nodeList)
{
XmlElement xe = (XmlElement)xn;
xe.SetAttribute("test", "111111");
XmlElement xesub = xmlDoc.CreateElement("flag");
xesub.InnerText = "1";
xe.AppendChild(xesub);
}
xmlDoc.Save(Server.MapPath("data.xml"));
}
/// <summary>
/// 删除节点中的某一个属性；
/// </summary>
public void DelectNodeAttribute()
{
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(Server.MapPath("data.xml"));
XmlNodeList xnl = xmlDoc.SelectSingleNode("Employees").ChildNodes;
foreach (XmlNode xn in xnl)
{
XmlElement xe = (XmlElement)xn;
xe.RemoveAttribute("genre");//删除genre属性
XmlNodeList nls = xe.ChildNodes;//继续获取xe子节点的所有子节点
foreach (XmlNode xn1 in nls)//遍历
{
XmlElement xe2 = (XmlElement)xn1;//转换类型
if (xe2.Name == "flag")//如果找到
{
xe.RemoveChild(xe2);//则删除
}
}
}
xmlDoc.Save(Server.MapPath("data.xml"));
}
/// <summary>
/// 删除节点；
/// </summary>
public void DelectNode()
{
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(Server.MapPath("data.xml"));
XmlNode root = xmlDoc.SelectSingleNode("Employees");
XmlNodeList xnl = xmlDoc.SelectSingleNode("Employees").ChildNodes;
for (int i = 0; i < xnl.Count; i++)
{
XmlElement xe = (XmlElement)xnl.Item(i);
if (xe.GetAttribute("genre") == "张三")
{
root.RemoveChild(xe);
if (i < xnl.Count) i = i - 1;
}
}
xmlDoc.Save(Server.MapPath("data.xml"));
}
/// <summary>
/// 按照文本文件读取xml
/// </summary>
/// <returns></returns>
public string GetXmlStrByXml() {
System.IO.StreamReader myFile = new System.IO.StreamReader(Server.MapPath("data.xml"), System.Text.Encoding.Default);
//注意System.Text.Encoding.Default
return myFile.ReadToEnd();//myString是读出的字符串
}
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学习来源：
http://www.cnblogs.com/txw1958/archive/2013/01/16/csharp-xml.html
