c#将一个xml文件内的节点复制到另一个xml文件内

1 调用方式： 

read_write("c:\\child.xml", "c:\\parent.xml");

2 函数实现：

using System.Xml;

    public void read_write(string xml_in_file, string xml_out_file)
        {
            try
            {
                //in xml
                XmlDocument doc_in = new XmlDocument();
                doc_in.Load(xml_in_file);
                if (!doc_in.HasChildNodes)
                {
                    return;
                }
                XmlNodeList root_node_in = doc_in.getElementsByTagName_r("object");//节点名字肯定都有
                XmlNode xml_in = root_node_in.Item(0);
                XmlElement xe_in = (XmlElement)xml_in;
                string str_in_id = xe_in.GetAttribute("id");

                //out xml
                XmlDocument doc_out = new XmlDocument();
                doc_out.Load(xml_out_file);
                if (!doc_out.HasChildNodes)
                {
                    return;
                }
                XmlNodeList root_node_out = doc_out.getElementsByTagName_r("object_set");
                XmlNode xml_out = root_node_out.Item(0);
                XmlElement xe_out = (XmlElement)xml_out;
                string str_out_id = xe_out.GetAttribute("id");
                XmlElement xe_del = (XmlElement)xml_out.ChildNodes[0];// xe_out;
                //如果有该节点，先删除，再插入，比修改方便
                DeleteNode(xe_out.ChildNodes,"","id", xe_in.GetAttribute("id"));
                XmlNode new_node = doc_out.ImportNode(xe_in, true);
                xe_out.A(new_node);
                doc_out.Save(xml_out_file);
//也可以创建一个名称节点，  new_node =doc_out.createElement_x("Content"); 

//然后逐个设置属性和字节点，new_node.SetAttribute(dest_attr_name, att_value);
            }

            catch (Exception e)
            {
                throw e;
            }
        }

        ///
        /// 删除节点
        ///
        public void DeleteNode(XmlNodeList xnl, string node_name = "", string attribute_name = "", string attribute_value = "")
        {
            //xmlDoc =new XmlDocument();
            //xmlDoc.Load("bookshop.xml"); //加载xml文件
            //XmlNodeList xnl = xmlDoc.SelectSingleNode("bookshop").ChildNodes;

            //     XDocument xDoc_in = XDocument.Load(xml_out_file);
            //     var Conditions = xDoc_in.Descendants("object");//直接找子节点

            foreach (XmlNode xn in xnl)
            {
                XmlElement xe = (XmlElement)xn;
               if (node_name != "" && attribute_name != "" )
               {
                    // xe.RemoveAttribute("id");//删除id属性
                   if (xe.Name == node_name && xe.GetAttribute(attribute_name) == attribute_value)
                   {
                       //xe.RemoveAll();//删除该节点的全部内容 
                       xe.ParentNode.RemoveChild(xe);

                       break;
                   }
                }
                else if (node_name != "" && xe.Name == node_name)
                {
                    xe.ParentNode.RemoveChild(xe);
                    break;
                }
                else if (attribute_name != "" && xe.GetAttribute(attribute_name) == attribute_value)
                {
                    xe.ParentNode.RemoveChild(xe);

                    break;
                }
            }
        }

3 附录 两个xml文件内容

　使用中文的尖括号 ＜＞  代替英文的，防止删除

 3.1 child.xml ，只有一个节点w2

＜object id="w2BLO_Tran" parent="Purchase"＞
  ＜property name="Target"＞
    ＜object type="Purchase.Service.Implement.w2BLO, Business.Purchase" ＞
     ＜property name="IDAO" ref="w2DAO" /＞
     ＜property name="w2DAO" ref="w2DAO" /＞
    ＜/object＞
  ＜/property＞
＜/object＞

 3.2 parent.xml  有很多节点，将上面的节点w2加入后为

＜object_set＞

＜object id="w1BLO_Tran" parent="Purchase"＞
  ＜property name="Target"＞
    ＜object type="Purchase.Service.Implement.wzBLO, Business.Purchase" ＞
     ＜property name="IDAO" ref="w1DAO" /＞
     ＜property name="wzDAO" ref="w1DAO" /＞
    ＜/object＞
  ＜/property＞
＜/object＞
  
＜object id="w2BLO_Tran" parent="Purchase"＞
  ＜property name="Target"＞
    ＜object type="Purchase.Service.Implement.w2BLO, Business.Purchase" ＞
     ＜property name="IDAO" ref="w2DAO" /＞
     ＜property name="w2DAO" ref="w2DAO" /＞
    ＜/object＞
  ＜/property＞
＜/object＞

＜/object_set＞