c# XML 有多個重復子節點操作

1,繼續添加ebm子節點

public static void CreateXml()
        {
            //創XML建對象
            XmlDocument doc = new XmlDocument();
            //聲明根節點
            XmlElement books;
            //判斷文件是否存在
            if (File.Exists("d://Test.xml"))
            {
                //該文件存在
                //加載文件
                doc.Load("d://Test.xml");
                //獲得根節點
                books = doc.DocumentElement;

            }
            else//該文件不存在
            {
                //創建聲明
                XmlDeclaration dec = doc.CreateXmlDeclaration("1.0", "utf-8", null);
                doc.AppendChild(dec);
                //創建根節點
                books = doc.CreateElement("EBD");
                doc.AppendChild(books);
            }

            //開始正常寫入信息就可以了
            XmlElement xml = doc.CreateElement("EBM");
            books.AppendChild(xml);

            XmlElement ebmId = doc.CreateElement("EBMID");
            ebmId.InnerText = "1";
            xml.AppendChild(ebmId);

            XmlElement areaCode = doc.CreateElement("AreaCode");
            areaCode.InnerText = "360699999901";
            xml.AppendChild(areaCode);

            XmlElement startTime = doc.CreateElement("StartTime");
            startTime.InnerText = "2018-07-26 9:06:04";
            xml.AppendChild(startTime);

            XmlElement endTime = doc.CreateElement("EndTime");
            endTime.InnerText = "2018-07-26 7:22:04";
            xml.AppendChild(endTime);

            XmlElement msgType = doc.CreateElement("MsgType");
            msgType.InnerText = "1";
            xml.AppendChild(msgType);

            doc.Save("d://Test.xml");
        }

2, 修改某個子節點(通過EBMID確定具體的節點)

public static void UpdateXmlForEBMID(string ebmId)
        {
            XmlDocument xmlDoc = new XmlDocument();
            xmlDoc.Load("d://Test.xml");
            var xns = xmlDoc.SelectSingleNode("EBD");
            XmlNodeList xnl = xns.ChildNodes;
            foreach(XmlNode xn in xnl )
            {
                XmlElement xe = (XmlElement)xn;
                XmlNodeList xnl2 = xe.ChildNodes;
                foreach (XmlNode xn2 in xnl2)
                {
                    XmlElement xe2 = (XmlElement)xn2;

                    if (xe2.InnerText.Equals(ebmId))
                    {
                        XmlNodeList elemList = xe.GetElementsByTagName("MsgType");
                        elemList[0].InnerXml = "2";
                    }
                    break;
                }
                //break;//如果更新完了指定節點，有需要則退出循環
            }
            xmlDoc.Save("d://Test.xml");//保存的該XML文件,否則更新無效
        }

3,讀取某個子節點下的所有屬性值(這邊也是通過EBMID去匹配)

public static void ReadXMLForLog(string xmlPath,string ebmId)
        {
            XmlDocument xmlDoc = new XmlDocument();
            xmlDoc.Load("d://Test.xml");
            var xns = xmlDoc.SelectSingleNode("EBD");
            XmlNodeList xnl = xns.ChildNodes;
            Dictionary<string, string> obj = new Dictionary<string, string>();
            
            foreach (XmlNode xn in xnl)
            {
                XmlElement xe = (XmlElement)xn;
                XmlNodeList xnl2 = xe.ChildNodes;

                foreach (XmlNode xn2 in xnl2)
                {
                    XmlElement xe2 = (XmlElement)xn2;
                    if (xe2.InnerText.Equals("2"))
                    {
                        var objs = new {
                            EBMID = xe.GetElementsByTagName("EBMID"),
                            AreaCode = xe.GetElementsByTagName("AreaCode"),
                            StartTime= xe.GetElementsByTagName("StartTime"),
                            EndTime = xe.GetElementsByTagName("EndTime"),
                            MsgType = xe.GetElementsByTagName("MsgType"),
                        };
                        string ebmIdValue = objs.EBMID[0].InnerText;
                    }
                    break;
                }
            }
        }