对象转换对同属性进行赋值

using System;
using System.Collections.Generic;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Reflection;

namespace WebLinq
{
public partial class _Default : System.Web.UI.Page
    {
protected void Page_Load(object sender, EventArgs e)
        {

            User u = new User();
            u.Age = 18;
            u.Name = "rhythmk";
            Man man = new Man();
     SetValue(u, man);
if (man != null)
            {
                Response.Write(man.Name);

            }
else {

                Response.Write("NULL");
            }
        }

public static void SetValue(object oldObj, object newObj)
        {
            Type oldType = oldObj.GetType();
            Type newType = newObj.GetType();

            PropertyInfo[] oldObjPropertyInfos = oldType.GetProperties();
for (int i = 0; i < oldObjPropertyInfos.Length; i++)
            {
if (oldObjPropertyInfos[i].CanRead)
                {
string strPropertyName = oldObjPropertyInfos[i].Name;
object newValue = GetPropertyValue(oldObj, strPropertyName);


if (newValue != null)
                        SetPropertyValue(newObj, strPropertyName, newValue);
                }
            }
        }

private static void SetPropertyValue(object obj, string strPropertyName, object val)
        {
            Type t = obj.GetType();
            PropertyInfo[] propertyInfos = t.GetProperties();
foreach (PropertyInfo pi in propertyInfos)
            {
if (pi.Name == strPropertyName)
                {
if (pi.CanWrite)
                        pi.SetValue(obj, val, null); 
                }
            }
        }

private static object GetPropertyValue(object obj, string strPropertyName)
        {
            Type t = obj.GetType();
            PropertyInfo[] propertyInfos = t.GetProperties();
foreach (PropertyInfo pi in propertyInfos)
            {
if (pi.Name == strPropertyName)
                {
if (pi.CanRead)
return pi.GetValue(obj, null);
                }
            }
return null;
        }
    }
}

主要是 避免在项目开发中 比如 Linq to sql  生成的数据类  跟实际的类 之间 进行赋值

而无需去进行

a.property1=b.property1;

a.property2=b.property2;

a.property3=b.property3;