XML 和 List 互转类代码,CSharp代码库,德仔网

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【CSharp】 XML 和 List 互转类
作者:hantianwei / 发布于2014/2/25/ 461
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
  }
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