C# basic series: Linq to Xml reading and writing xml

?xml version="1.0" encoding="utf-8"?>

<BizADsList>

  <adData aid="1" image="baidu.jpg" link="www.baidu.com" title="百度"/>

  <adData aid="2" image="qq.jpg" link="www.qq.com" title="腾讯"/>

</BizADsList>

var strPath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, @"data\test.xml");
            XDocument adList = XDocument.Load(strPath);

            var ad = from a in adList.Descendants("BizADsList").Elements("adData")

                     select new

                     {

                         image = a.Attribute("image").Value,

                         link = a.Attribute("link").Value,

                         title = a.Attribute("title").Value

                     };

            string s = "";

            foreach (var a in ad)

                s += a.image;

   /// <summary>
        /// 根据得到的Document集合生成XML
        /// </summary>
        /// <param name="lstDocumentBD"></param>
        /// <param name="docNE"></param>
        /// <param name="strSpiderTime"></param>
        /// <param name="strNewRate"></param>
        private static void SaveXmlByLstDocument(List<Document> lstDocumentBD, Document docNE, string strSpiderTime, string strNewRate)
        {
            try
            {
                XDocument xDoc = new XDocument();
                XElement xRoot = new XElement(CSpiderConst.XML_ELE_ROOT);

                //1.构造Device节点
                XElement xDevice = new XElement(CSpiderConst.XML_ELE_DEVICE);

                //2.构造NE节点
                XElement xNE = new XElement(CSpiderConst.XML_ELE_NE);
                foreach (var oDocNE in docNE)
                {
                    XElement xItem = new XElement(CSpiderConst.XML_ELE_ITEM, new XAttribute(CSpiderConst.XML_PROP_NAME, oDocNE.Key), oDocNE.Value);
                    xNE.Add(xItem);
                }
                //这里增加一个<Item name=&#39;NewRate&#39;>和<Item name=&#39;SpiderTimeEx&#39;>节点用来保存当前这次的利用率和当次的采集时间
                AddNewRateAndSpiderTime(strSpiderTime, strNewRate, xNE);
                xDevice.Add(xNE);

                //3.循环构造BD节点并添加到Device节点中
                foreach (var oDocument in lstDocumentBD)
                {
                    XElement xBD = new XElement(CSpiderConst.XML_ELE_BD);
                    foreach (var oDocBD in oDocument)
                    {
                        XElement xItem = new XElement(CSpiderConst.XML_ELE_ITEM, new XAttribute(CSpiderConst.XML_PROP_NAME, oDocBD.Key), oDocBD.Value);
                        xBD.Add(xItem);
                    }
                    AddNewRateAndSpiderTime(strSpiderTime, strNewRate, xBD);
                    xDevice.Add(xBD);
                }
                xRoot.Add(xDevice);
                xDoc.Add(xRoot);

                //4.保存到采集器本地，以服务器的时间和网元的AssetID来命名
                var strDirectoryPath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "ReportFailed\\");
                if (!Directory.Exists(strDirectoryPath))
                {
                    Directory.CreateDirectory(strDirectoryPath);
                }
                xDoc.Save(strDirectoryPath + docNE[TBLDeviceLCBB.PROP_ASSETID] + "_" + strSpiderTime.Replace(":", "_") + ".xml");
            }
            catch
            {
                CLogService.Instance.Debug("保存XML失败");
            }
        }

<?xml version="1.0" encoding="utf-8" ?>
<DataSet xmlns="http://WebXml.com.cn/">
  <xs:schema xmlns="" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata" id="getRegion">
    <msdata:aa>
      test
    </msdata:aa>
    <xs:element name="getRegion" msdata:IsDataSet="true" msdata:UseCurrentLocale="true">
      <xs:element name="Province">
        <xs:sequence>
          <xs:element name="RegionID" type="xs:string" minOccurs="0"/>
          <xs:element name="RegionName" type="xs:string" minOccurs="0"/>
        </xs:sequence>
      </xs:element>
    </xs:element>
  </xs:schema>
</DataSet>

var strPath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, @"data\test.xml");
var oRoot = XDocument.Load(strPath);
//取DataSet标签
var oDataSet = oRoot.Element(XName.Get("DataSet", "http://WebXml.com.cn/"));
//取schema标签
var oSchema = oDataSet.Element(XName.Get("schema", "http://www.w3.org/2001/XMLSchema"));
//取element标签
var oElement = oSchema.Element(XName.Get("element", "http://www.w3.org/2001/XMLSchema"));//这两个节点都是以xs打头，所以命名空间都是xs的命名空间
//取element标签下面的IsDataSet属性
var oElementValue = oElement.Attribute(XName.Get("IsDataSet", "urn:schemas-microsoft-com:xml-msdata"));
//取aa标签
var oAA = oSchema.Element(XName.Get("aa", "urn:schemas-microsoft-com:xml-msdata"));

<xs:schema xmlns="" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata" id="getRegion">

<msdata:aa>
      test
 </msdata:aa>

<xs:element name="getRegion" msdata:IsDataSet="true" msdata:UseCurrentLocale="true">

var oElementValue = oElement.Attribute(XName.Get(“IsDataSet”, “urn:schemas-microsoft-com:xml-msdata”));