WPF中两种设计模式操作XML转实体类

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

namespace Test
{
    public class Helper
    {
        private static void SetPropertyByAttribute(object obj, XAttribute attr)
        {
            PropertyInfo property = obj.GetType().GetProperty(attr.Name.LocalName);
            //MethodInfo[] convs = property.PropertyType.GetMethods();
            //MethodInfo conv = property.PropertyType.GetMethod("op_Explicit", convParamTypes);
            property.SetValue(obj, Convert.ChangeType(attr.Value, property.PropertyType, null), null);
        }

        public static List<T> ParseXmlToList<T>(XElement element) where T : new()
        {
            try
            {
                List<T> list = new List<T>();

                Type type = Type.GetType("FreeForm." + element.Name.ToString().Substring(0, element.Name.ToString().Length - 1));

                IEnumerable<XElement> elms = element.Descendants();

                foreach (XElement elem in elms)
                {

                    object obj = Activator.CreateInstance(type);

                    Type[] convParamTypes = new Type[] { typeof(string) };

                    IEnumerable<XAttribute> attributes = elem.Attributes();

                    foreach (XAttribute attr in attributes)
                    {
                        SetPropertyByAttribute(obj, attr);

                    }
                    list.Add((T)obj);
                }

                return list;
            }
            catch
            {
                return null;
            }
        }


        public static List<T> XmlToObjList<T>(string xml, string headtag)
            where T : new()
        {
            List<T> list = new List<T>();
            XmlDocument doc = new XmlDocument();
            PropertyInfo[] propinfos = null;
            doc.LoadXml(xml);
            
            XmlNodeList nodelist = doc.SelectNodes("/" + headtag + "/item");
            foreach (XmlNode node in nodelist)
            {
                T entity = new T();
                //初始化propertyinfo
                if (propinfos == null)
                {
                    Type objtype = entity.GetType();
                    propinfos = objtype.GetProperties();
                }
                //填充entity类的属性
                foreach (PropertyInfo propinfo in propinfos)
                {
                    XmlNode cnode = node.SelectSingleNode(propinfo.Name);
                    string v = cnode.InnerText;
                    if (v != null)
                        propinfo.SetValue(entity, Convert.ChangeType(v, propinfo.PropertyType), null);
                }
                list.Add(entity);
            }
            return list;
        }

        public static XElement ObjectToXmlAttributes<T>(List<T> enitities, string headtag)
        {
            XElement xm = new XElement(headtag+"s");
            PropertyInfo[] propinfos = null;
            foreach (T obj in enitities)
            {
                //初始化propertyinfo
                if (propinfos == null)
                {
                    Type objtype = obj.GetType();
                    propinfos = objtype.GetProperties();
                }
                XElement child = new XElement(headtag);
                foreach (PropertyInfo propinfo in propinfos)
                {
                   XAttribute xa = new XAttribute(propinfo.Name,propinfo.GetValue(obj, null));
                   child.Add(xa);
                }
                xm.Add(child);
            }
            return xm;
        }

        public static XElement ObjectToXmlNodes<T>(List<T> enitities, string headtag)
        {
            XElement xm = new XElement(headtag + "s");
            PropertyInfo[] propinfos = null;
            foreach (T obj in enitities)
            {
                //初始化propertyinfo
                if (propinfos == null)
                {
                    Type objtype = obj.GetType();
                    propinfos = objtype.GetProperties();
                }
                XElement child = new XElement(headtag);
                foreach (PropertyInfo propinfo in propinfos)
                {
                    XElement xa = new XElement(propinfo.Name, propinfo.GetValue(obj, null));
                    child.Add(xa);
                }
                xm.Add(child);
            }
            return xm;
        }


        public static string ObjectToXmlString<T>(List<T> enitities, string headtag)
        {
            StringBuilder sb = new StringBuilder();
            PropertyInfo[] propinfos = null;
            sb.AppendLine("<?xml version=\"1.0\" encoding=\"utf-8\"?>");
            sb.AppendLine("<" + headtag + ">");
            foreach (T obj in enitities)
            {
                //初始化propertyinfo
                if (propinfos == null)
                {
                    Type objtype = obj.GetType();
                    propinfos = objtype.GetProperties();
                }
                sb.AppendLine("<item>");
                foreach (PropertyInfo propinfo in propinfos)
                {
                    sb.Append("<");
                    sb.Append(propinfo.Name);
                    sb.Append(">");
                    sb.Append(propinfo.GetValue(obj, null));
                    sb.Append("</");
                    sb.Append(propinfo.Name);
                    sb.AppendLine(">");
                }
                sb.AppendLine("</item>");
            }
            sb.AppendLine("</" + headtag + ">");
            return sb.ToString();
        }
       
    }
}

 

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

namespace FreeForm

{
    class Program
    {
        static void Main(string[] args)
        {
            System.Xml.Linq.XElement sample = System.Xml.Linq.XElement.Parse(
           "<Element a=\"3\" b=\"Havarti\" modeSel=\"Complex\" />");
 
            Element c1 = Element.ParseXml(sample);
            Element c2 = XmlToEntityWrapper.ParseXml(sample) as Element;


        }
    }

    public class ModeSelection
    {
        private int mode;

        bool isPassed;

        public bool Validate(string input)
        {
            if (input == "Complex")
            {
                this.isPassed = true;
                return true;
            }
            else
            {
                this.isPassed = false;
                return false;
            }
        }

        public static explicit operator ModeSelection(string value)
        {
            ModeSelection result = new ModeSelection();
            if (String.Compare(value, "Simple", true) == 0)
                result.mode = 1;
            else if (String.Compare(value, "Complex", true) == 0)
                result.mode = 2;
            else if (!int.TryParse(value, out result.mode))
                throw new FormatException("Cannot convert value to type " + result.GetType().Name);
            return result;
        }
        string Name
        {
            get;
            set;
        }
        string Description
        {
            get
            {
                switch (mode)
                {
                    case 1:
                        return "Simple";
                    case 2:
                        return "Complex";
                    default:
                        return "Other";
                }
            }
        }
    }

    public static class XmlToEntityWrapper
    {
        public static object ParseXml(System.Xml.Linq.XElement element)
        {
            try
            {
                Type type = Type.GetType("FreeForm." + element.Name);
                object obj = Activator.CreateInstance(type);

                Type[] convParamTypes = new Type[] { typeof(string) };

                IEnumerable<XAttribute> attributes = element.Attributes();

                foreach (XAttribute attr in attributes)
                {
                    PropertyInfo property = obj.GetType().GetProperty(attr.Name.LocalName);
                    MethodInfo[] convs = property.PropertyType.GetMethods();
                    MethodInfo conv = property.PropertyType.GetMethod("op_Explicit", convParamTypes);

                    //MethodInfo exeValidate = property.PropertyType.GetMethod("Validate");

                    //if (exeValidate != null)
                    //{
                    //    property.SetValue(obj, exeValidate.Invoke(null, new object[] { attr.Value }), null);
                    //}

                    if (conv != null)
                    {
                        property.SetValue(obj, conv.Invoke(null, new object[] { attr.Value }), null);
                    }
                    else
                    {
                        property.SetValue(obj, Convert.ChangeType(attr.Value, property.PropertyType), null);
                    }
                }

                return obj;
            }
            catch
            {
                return null;
            }
        }
    }

    public abstract class XmlToEntity<T> where T : XmlToEntity<T>, new()
    {
        public static T ParseXml(System.Xml.Linq.XElement element)
        {
            object e = (T)Activator.CreateInstance(Type.GetType("FreeForm." + element.Name));

            Type[] convParamTypes = new Type[] { typeof(string) };

            IEnumerable<XAttribute> attributes =element.Attributes();

            foreach (XAttribute attr in attributes)
            {
                PropertyInfo property = e.GetType().GetProperty(attr.Name.LocalName);
                //MethodInfo[] convs = property.PropertyType.GetMethods();
                MethodInfo conv = property.PropertyType.GetMethod("op_Explicit", convParamTypes);

                if (conv != null)
                {
                    property.SetValue(e, conv.Invoke(null, new object[] { attr.Value }), null);
                }
                else
                    property.SetValue(e, Convert.ChangeType(attr.Value, property.PropertyType), null);
            }

            return (T)e;
        }

        public XmlToEntity()
        {
            Elements = new List<T>();
        }

        public IList<T> Elements
        {
            get;
            set;
        }
    }

    public class Elements
    {
        public List<Element> Elements
        {
            get;
            set;
        }
    }

    public class Element : XmlToEntity<Element>
    {
        int _a;
        string _b;

        public string b
        {
            get { return _b; }
            set { _b = value; }
        }
        ModeSelection _modeSel;

        public ModeSelection modeSel
        {
            get { return _modeSel; }
            set { _modeSel = value; }
        }

        public int a
        {
            get
            {
                return _a;
            }
            set
            {
                _a = value;
            }
        }

    }
}