1.使用XmlDocument读取XML文件

StringReader stream = null;
XmlTextReader reader = null;
                        try
                        {
							//加载xml 
							XmlDocument xmlDoc = new XmlDocument();
							xmlDoc.Load(path+filename); 
							//将xml文件转换为DataSet
							DataSet xmlDS = new DataSet();
							stream = new StringReader(xmlDoc.InnerXml);
							//从stream装载到XmlTextReader
							reader = new XmlTextReader(stream);
							xmlDS.ReadXml(reader);

							for (int i = 0; i < xmlDS.Tables[0].Rows.Count; i++)
							{
								model.ID = xmlDS.Tables[0].Rows[i]["ID"].ToString();//主键ID 
							}
			}