XmlHelper

1. 获取XML节点的值(http服务使用xml传输数据，节点名称唯一)
   
   

       /// <summary>
       /// 获取xml节点的值
       /// </summary>
       /// <param name="xml">xml字符串</param>
       /// <param name="xmlnode">节点名</param>
       /// <returns>节点值</returns>
       public static string GetXmlNodeValue(string xml, string xmlnode)
       {
           XmlDocument xmlDoc = new XmlDocument();
           xmlDoc.LoadXml(xml);
           string val = XDocument.Load(new StringReader(xml)).Descendants(xmlnode).First().Value; 
           return val;
       }

2. 获取XML节点的内容(http服务使用xml传输数据，节点名称唯一)

   /// <summary>
       /// 获取xml节点的内容
       /// </summary>
       /// <param name="xml">xml字符串</param>
       /// <param name="xmlnode">节点名</param>
       /// <returns>节点值</returns>
       public static string GetXmlNodeNode(string xml, string xmlnode)
       {
           XmlDocument xmlDoc = new XmlDocument();
           xmlDoc.LoadXml(xml);
           object val = XDocument.Load(new StringReader(xml)).Descendants(xmlnode).First();
           return val.ToString();
       }

3. XML与DataSet互转(xml文件与DataTable格式一致)

   　　 private string ConvertDataTableToXML(DataTable xmlDS)
       {
           MemoryStream stream = null;
           XmlTextWriter writer = null;
           try
           {
               stream = new MemoryStream();
               writer = new XmlTextWriter(stream, Encoding.Default);
               xmlDS.WriteXml(writer);
               int count = (int)stream.Length;
               byte[] arr = new byte[count];
               stream.Seek(0, SeekOrigin.Begin);
               stream.Read(arr, 0, count);
               UTF8Encoding utf = new UTF8Encoding();
               return utf.GetString(arr).Trim();
           }
           catch
           {
               return String.Empty;
           }
           finally
           {
               if (writer != null) writer.Close();
           }
       } 
       private DataSet ConvertXMLToDataSet(string xmlData)
       {
         StringReader stream = null;
         XmlTextReader reader = null;
         try
         {
           DataSet xmlDS = new DataSet();
           stream = new StringReader(xmlData);
           reader = new XmlTextReader(stream);
           xmlDS.ReadXml(reader);
           return xmlDS;
         }
         catch (Exception ex)
         {
           string strTest = ex.Message;
           return null;
         }
         finally
         {
           if (reader != null)
           reader.Close();
         }
       }

4. 获取节点的所有子节点，并用哈希表保存值

//获取节点的所有子节点，并用哈希表保存值 
    private Hashtable GetChildNodesHT(XmlDocument xmlDoc, string strNodeName) 
    { 
        Hashtable ht = new Hashtable(); 
        XmlNodeList xnThis = xmlDoc.GetElementsByTagName(strNodeName); 
        try
        { 
            XmlNodeList childNodes = xnThis[0].ChildNodes; 
            foreach (XmlNode xn in childNodes) 
            { 
                if (ht.ContainsKey(xn.Name) == false) 
                { 
                    ht[xn.Name] = xn.InnerText; 
                } 
            } 
        } 
        catch { } 
        return ht; 
    }