C# 读写xml

.net3.5及以上框架增强了对xml的支持，操作xml非常方便，下面分别用.net2.0及.net3.5及以上版本操作xml。

.net2.0版本读xml的demo:特别适用于配置文件的读取，类似于下面的这种情况：

<?xml version="1.0" encoding="utf-8"?>
<SAP>
  <aa>编码</aa>
<bb>名称</bb> 
</SAP>

代码:

        /// <summary>
        /// 读取xml返回字典
        /// </summary>
        /// <param name="xmlPath">绝对路径</param>
        /// <param name="nodeName">节点名</param>
        /// <returns></returns>
        public static Dictionary<string, string> GetAllData(string xmlPath, string nodeName)
        {
            XmlDataDocument xmlDoc = new XmlDataDocument();
            xmlDoc.Load(xmlPath);
            XmlNode xn = xmlDoc.SelectSingleNode(nodeName);
            Dictionary<string, string> dic = new Dictionary<string, string>();
            try
            {
                foreach (XmlNode xnf in xn)
                {
                    XmlElement xe = xnf as XmlElement;
                    dic.Add(xe.Name, xe.InnerText);
                }
            }
            catch (Exception)
            {
                return null;
            }
            return dic.Count > 0 ? dic : null;
        }

用linq读xml：

        public ObservableCollection<Tree> GetTreeList()
        {
            try
            {
                XmlReader xmlReader = XmlReader.Create(new StringReader(xml));
                XDocument xDocument = XDocument.Load(xmlReader);
                var quota = from p in xDocument.Descendants("ID").Descendants("PID").Descendants("Pic").Descendants("Name")
                            select new Tree
                            {
                                Name = p.Attribute("Name").Value,
                                ID = p.Attribute("ID").Value,
                                Pic = p.Attribute("Pic").Value,
                                PID = p.Attribute("PID").Value
                            };
                if (quota != null)
                {
                    foreach (var item in quota)
                    {
                        Tree tree = new Tree { ID = item.ID, Name = item.Name, PID = item.PID, Pic = item.Pic };
                        treeList.Add(tree);
                    }
                }
                return treeList;
            }
            catch (Exception)
            {
                throw;
            }
        }

对应xml为：

<?xml version="1.0" encoding="utf-8" ?>
<Tree>
  <TreeNode ID="01" Name="sddd" PID="0" Pic="" ></TreeNode>
  <TreeNode ID="02" Name="ddd" PID="0" Pic="" ></TreeNode>
  <TreeNode ID="03" Name="dddd" PID="0" Pic="" ></TreeNode>
  <TreeNode ID="0121" Name="qqq" PID="01" Pic="" FontSize="12"></TreeNode>
  <TreeNode ID="0122" Name="tttt" PID="01" Pic="" FontSize="12"></TreeNode>
  <TreeNode ID="0123" Name="ttss" PID="01" Pic="" FontSize="12"></TreeNode>

</Tree>

通过对比，显然高版本的.net framework操作xml简单方便得多，而且可读性强。