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;