XML 和 List 互转类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml;

namespace XmlHelper
{
     ///   <summary>
     ///  实体转Xml，Xml转实体类
     ///   </summary>
     ///   <typeparam name="T"></typeparam>
     public  class XmlHelper<T>  where T :  new()
    {
         #region 实体类转成Xml
         ///   <summary>
         ///  对象实例转成xml
         ///   </summary>
         ///   <param name="item"> 对象实例 </param>
         ///   <returns></returns>
         public  static  string EntityToXml(T item)
        {
            IList<T> items =  new List<T>();
            items.Add(item);
             return EntityToXml(items);
        }

         ///   <summary>
         ///  对象实例集转成xml
         ///   </summary>
         ///   <param name="items"> 对象实例集 </param>
         ///   <returns></returns>
         public  static  string EntityToXml(IList<T> items)
        {
             // 创建XmlDocument文档
            XmlDocument doc =  new XmlDocument();
             // 创建根元素
            XmlElement root = doc.CreateElement( typeof(T).Name +  " s ");
             // 添加根元素的子元素集
             foreach (T item  in items)
            {
                EntityToXml(doc, root, item);
            }
             // 向XmlDocument文档添加根元素
            doc.AppendChild(root);

             return doc.InnerXml;
        }

         private  static  void EntityToXml(XmlDocument doc, XmlElement root, T item)
        {
             // 创建元素
            XmlElement xmlItem = doc.CreateElement( typeof(T).Name);
             // 对象的属性集

            System.Reflection.PropertyInfo[] propertyInfo =
             typeof(T).GetProperties(System.Reflection.BindingFlags.Public |
            System.Reflection.BindingFlags.Instance);



             foreach (System.Reflection.PropertyInfo pinfo  in propertyInfo)
            {
                 if (pinfo !=  null)
                {
                     // 对象属性名称
                     string name = pinfo.Name;
                     // 对象属性值
                     string value = String.Empty;

                     if (pinfo.GetValue(item,  null) !=  null)
                        value = pinfo.GetValue(item,  null).ToString(); // 获取对象属性值
                     // 设置元素的属性值
                    xmlItem.SetAttribute(name, value);
                }
            }
             // 向根添加子元素
            root.AppendChild(xmlItem);
        }


         #endregion

         #region Xml转成实体类

         ///   <summary>
         ///  Xml转成对象实例
         ///   </summary>
         ///   <param name="xml"> xml </param>
         ///   <returns></returns>
         public  static T XmlToEntity( string xml)
        {
            IList<T> items = XmlToEntityList(xml);
             if (items !=  null && items.Count >  0)
                 return items[ 0];
             else  return  default(T);
        }

         ///   <summary>
         ///  Xml转成对象实例集
         ///   </summary>
         ///   <param name="xml"> xml </param>
         ///   <returns></returns>
         public  static IList<T> XmlToEntityList( string xml)
        {
            XmlDocument doc =  new XmlDocument();
             try
            {
                doc.LoadXml(xml);
            }
             catch
            {
                 return  null;
            }
             if (doc.ChildNodes.Count !=  1)
                 return  null;
             if (doc.ChildNodes[ 0].Name.ToLower() !=  typeof(T).Name.ToLower() +  " s ")
                 return  null;

            XmlNode node = doc.ChildNodes[ 0];

            IList<T> items =  new List<T>();

             foreach (XmlNode child  in node.ChildNodes)
            {
                 if (child.Name.ToLower() ==  typeof(T).Name.ToLower())
                    items.Add(XmlNodeToEntity(child));
            }

             return items;
        }

         private  static T XmlNodeToEntity(XmlNode node)
        {
            T item =  new T();

             if (node.NodeType == XmlNodeType.Element)
            {
                XmlElement element = (XmlElement)node;

                System.Reflection.PropertyInfo[] propertyInfo =
             typeof(T).GetProperties(System.Reflection.BindingFlags.Public |
            System.Reflection.BindingFlags.Instance);

                 foreach (XmlAttribute attr  in element.Attributes)
                {
                     string attrName = attr.Name.ToLower();
                     string attrValue = attr.Value.ToString();
                     foreach (System.Reflection.PropertyInfo pinfo  in propertyInfo)
                    {
                         if (pinfo !=  null)
                        {
                             string name = pinfo.Name.ToLower();
                            Type dbType = pinfo.PropertyType;
                             if (name == attrName)
                            {
                                 if (String.IsNullOrEmpty(attrValue))
                                     continue;
                                 switch (dbType.ToString())
                                {
                                     case  " System.Int32 ":
                                        pinfo.SetValue(item, Convert.ToInt32(attrValue),  null);
                                         break;
                                     case  " System.Boolean ":
                                        pinfo.SetValue(item, Convert.ToBoolean(attrValue),  null);
                                         break;
                                     case  " System.DateTime ":
                                        pinfo.SetValue(item, Convert.ToDateTime(attrValue),  null);
                                         break;
                                     case  " System.Decimal ":
                                        pinfo.SetValue(item, Convert.ToDecimal(attrValue),  null);
                                         break;
                                     case  " System.Double ":
                                        pinfo.SetValue(item, Convert.ToDouble(attrValue),  null);
                                         break;
                                     default:
                                        pinfo.SetValue(item, attrValue,  null);
                                         break;
                                }
                                 continue;
                            }
                        }
                    }
                }
            }
             return item;
        }

         #endregion
    }