C#操作XML文件实例汇总

针对xml文件的操作是c#程序设计中非常常见的功能。本文即以实例展示了c#操作xml文件的几个常见的示例。具体如下：

1.返回节点下标

public static xmldocument getdoc(string path)//加载xml文档
{
  xmldocument doc = new xmldocument();
  doc.load(path);
  return doc;
} 
/// <summary>
/// 返回找到的节点下标
/// </summary>
/// <param name="path">xml文件路径</param>
/// <param name="bname">书名</param>
/// <returns></returns>
public static int getposition(string path,string node, string bname)
{
  int i;
  xmldocument doc = new xmldocument();
  doc.load(path);
  xmlnodelist nodelist = doc.selectsinglenode(node).childnodes;
  for (i = 0; i < nodelist.count; i++)
  {
 if (nodelist[i].childnodes[0].innertext == bname)
 {
   return i;
 }
  }
  return -1;
}

2.遍历数据

/// <summary>
/// 遍历数据
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void btnread_click(object sender, eventargs e)
{

  xmldocument doc = getdoc("books.xml");//加载xml文档，books文件存放于
  foreach (xmlelement root in doc.documentelement.childnodes)//遍历根的子节点
  {
 response.write("<script>document.write('<br/>');</script>");
 response.write("<script>document.write('" + root.name + "');</script>");//节点名root.name book
 foreach (xmlelement item in root.childnodes)
 {
   response.write("<script>document.write('" + item.name + "'+':'+'" + item.innertext + "');</script>");//输出节点名和文本节点的值
   response.write("<script>document.write('<br/>');</script>");
 }
  }
}

3.查找

/// <summary>
/// 查找
/// </summary>
/// <param name="path">文件路径</param>
/// <param name="node">节点</param>
/// <param name="bname">查找关键字</param>
/// <returns>xmlnode</returns>
public static xmlnode find(string path,string node,string bname)
{
  xmldocument doc = new xmldocument();
  doc.load(path);//加载xml文档
  xmlnodelist nodelist = doc.selectsinglenode(node).childnodes;
  int i = getposition(path, node, bname);//
  if (i >= 0)
 return nodelist[i];
  else
 return null;
}

4.删除节点

/// <summary>
/// 删除元素、属性
/// </summary>
/// <param name="path">文件</param>
/// <param name="node">指定节点的父节点</param>
/// <param name="attribute">为空时删除节点，否则删除属性</param>
/// <param name="bname"></param>
public static void delete(string path,string node,string attribute,string bname)
{
  xmldocument doc = new xmldocument();
  doc.load(path);
  xmlnode root = doc.selectsinglenode(node);
  xmlnodelist nodelist = doc.selectsinglenode(node).childnodes;
  int i = getposition(path, node, bname);//返回指定的节点下标
  if (i >= 0)
  {
 if (attribute.equals(""))
 {
   root.removechild(nodelist[i]);
 }
 else
 {
   xmlelement xn = (xmlelement)nodelist[i];
   xn.removeattribute(attribute);
 }
  }
  doc.save(path);
}

5.添加

/// <summary>
/// 添加元素值
/// </summary>
/// <param name="path"></param>
/// <param name="node"></param>
/// <param name="element"></param>
/// <param name="value"></param>
/// <param name="i">插入的下标，如果为负，默认从最后一个节点插入</param>
/// <returns></returns>
public static bool add(string path,string node,string element,string value,int i)
{
  xmldocument doc = new xmldocument();
  doc.load(path);
  xmlnodelist nodelist = doc.selectnodes(node);
  xmlnode newnode = doc.selectsinglenode(node).lastchild;
  if (i < 0 || i > nodelist.count-1)//如果小于0或者大于节点长度，默认从最后一个节点添加
  {
 xmlelement newelement = doc.createelement(element);//创建元素
 newelement.innertext = value;//赋值
 newnode.appendchild(newelement);
  }
  else
  {
 xmlelement newelement = doc.createelement(element);
 newelement.innertext = value;
 nodelist[i - 1].appendchild(newelement);
  }
  doc.save(path);
  return true;
}

希望本文所述方法对大家的c#程序设计能有所帮助。