XML操作

读写操作xml 3种方法 第一种略
读2
//实例化文档对象 版本信息 根元素
 XmlDocument xml = new XmlDocument();
 XmlDeclaration xel = xml.CreateXmlDeclaration("1.0", "utf-8", null);
 xml.InsertBefore(xel, xml.DocumentElement);//版本信息放入跟元素前面
 XmlElement root = xml.CreateElement("T"); //实例化一级子节点
 for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
 {
   XmlElement t =xml.CreateElement("TT");
    for (int j = 0; j < ds.Tables[0].Columns.Count; j++)
    {
       XmlElement tt =xml.CreateElement(ds.Tables[0].Columns[j].ToString());
       tt.InnerText = ds.Tables[0].Rows[i][j].ToString();
       t.AppendChild(tt);
    }
      root.AppendChild(t);
 }
    xml.AppendChild(root);
    xml.Save(Path.Combine(Application.StartupPath, "xxxx.xml"));
    MessageBox.Show("OK"); tt.InnerText = ds.Tables[0].Rows[i][j].ToString();
                  
读取2
//定义对象
XmlDocument xml = new XmlDocument();
xml.Load(Path.Combine(Application.StartupPath, "xxx.xml"));
XmlNodeList xn = xml.SelectNodes("T/TT");
DataTable xmltable = new DataTable();
//定义表标题
foreach (XmlNode x in xn)
{
    foreach (XmlNode xx in x.ChildNodes)
    {
        DataColumn col = new DataColumn(xx.Name.ToString());
        xmltable.Columns.Add(col);
    }
       break;
    }
        foreach (XmlNode x in xn)
       {
          DataRow dr = xmltable.NewRow();
          for (int i = 0; i < x.ChildNodes.Count; i++)
         {
             XmlNode xx = x.SelectSingleNode(xmltable.Columns[i].ToString());
            dr[i] = xx.InnerText;
        }
        xmltable.Rows.Add(dr);
 }
//得到对应节点
       dataGridView1.DataSource = xmltable;