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  • c#反射Reflected的应用

制作者:剑锋冷月 单位:无忧统计网,www.51stat.net
  本文示例源代码或素材下载
  反射(Reflection)是C#里很重要的一个特性,其它语言也有这个特性,比如JAVA。反射这个特性是很实用的,这个到底有多实用呢,我也说不清,如果使用过struts, hibernate, spring等等这些框架的话,便会知道反射这个特性是多么的强大了。好像我列出的都是JAVA的框架,.NET的框架我不了解,有没有我都不知道。但在我接触过的那些框架中,没有一个框架是不使用反射的,没有反射特性的语言除外。
  最近比较累,我就不多说了,直接看代码吧。
  这是Model程序集中的一个类:
Code
using System;
using System.Collections.Generic;
using System.Text;
namespace Model
{
  public class UserInfo
  {
    private int userId;
    public int UserId
    {
      get { return userId; }
      set { userId = value; }
    }
    private string userName;
    public string UserName
    {
      get { return userName; }
      set { userName = value; }
    }
    public void Show()
    {
      Console.WriteLine("UserId:" + userId + ", UserName:" + userName);
    }
  }
}
  这是反射的操作:
Code
using System;
using System.Collections.Generic;
using System.Text;
using System.Reflection;
namespace ObjectLoader
{
  public class ShowObject
  {
    //加载程序集
    private Assembly assembly = Assembly.Load("Model");
    /// <summary>
    /// 实例化类,要包含它的命名空间
    /// </summary>
    /// <param name="objName">类名</param>
    /// <returns></returns>
    public object LoadObject(string objName)
    {
      return assembly.CreateInstance("Model." + objName);
    }
    /// <summary>
    /// 返回所有的公共属性
    /// </summary>
    /// <param name="obj"></param>
    /// <returns></returns>
    public PropertyInfo[] GetPropertys(object obj)
    {
      Type type = obj.GetType();
      PropertyInfo[] infos = type.GetProperties();
      return infos;
    }
    /// <summary>
    /// 设置实例的指定属性值
    /// </summary>
    /// <param name="obj">实例</param>
    /// <param name="property">属性名</param>
    /// <param name="value">值</param>
    public void SetPropertyValue(object obj, string property, object value)
    {
      Type type = obj.GetType();
      PropertyInfo info = type.GetProperty(property);
      if (info != null)
      {
        info.SetValue(obj, value, null);
      }
    }
    /// <summary>
    /// 返回指定属性值
    /// </summary>
    /// <param name="obj">实例</param>
    /// <param name="property">属性名</param>
    /// <returns></returns>
    public object GetPropertyValue(object obj, string property)
    {
      Type type = obj.GetType();
      PropertyInfo info = type.GetProperty(property);
      if (info == null)
      {
        return null;
      }
      return info.GetValue(obj, null);
    }
    /// <summary>
    /// 执行实例的指定方法
    /// </summary>
    /// <param name="obj"></param>
    /// <param name="methodName">方法名</param>
    public void ExecuteMethod(object obj, string methodName)
    {
      Type type = obj.GetType();
      MethodInfo info = type.GetMethod(methodName);
      if (info != null)
      {
        info.Invoke(obj, null);
      }
    }
  }
}
  下面是测试类:
Code
using System;
using System.Collections.Generic;
using System.Text;
using System.Reflection;
using Model;
using ObjectLoader;
namespace ReflectionTest
{
  class Program
  {
    static void Main(string[] args)
    {
      ShowObject showObj = new ShowObject();
      object obj = showObj.LoadObject("UserInfo");
      Console.WriteLine("实例名:" + obj.GetType().FullName);
      Console.WriteLine("实例的所有公共属性:");
      PropertyInfo[] pInfos = showObj.GetPropertys(obj);
      foreach (PropertyInfo info in pInfos)
      {
        Console.WriteLine(info.GetType() + ":" + info.Name);
      }
      showObj.SetPropertyValue(obj, "UserId", 1);
      showObj.SetPropertyValue(obj, "UserName", "admin");
      Console.WriteLine("设置属性值后的值");
      Console.WriteLine("UserId:" + showObj.GetPropertyValue(obj,"UserId"));
      Console.WriteLine("UserName:" + showObj.GetPropertyValue(obj, "UserName"));
      Console.WriteLine("执行实例的方法:");
      showObj.ExecuteMethod(obj, "Show");
    }
  }
}
  程序的运行结果如下图:

  上面只是介绍了反射的应用而已,下面介绍反射在数据库操作层的应用。好晚了,想睡觉了,直接看代码吧.
Code
using System;
using System.Collections;
using System.Text;
using System.Data;
using ObjectLoader;
namespace DataTableAOP
{
  public class ObjectList
  {
    /// <summary>
    /// 将DataTable转换成ArrayList
    /// </summary>
    /// <param name="dataTable"></param>
    /// <param name="name">类名</param>
    /// <returns></returns>
    public static ArrayList GetObjectList(DataTable dataTable, string name)
    {
      ShowObject show = new ShowObject();
      DataRowCollection rows = dataTable.Rows;
      ArrayList list = new ArrayList();
      foreach (DataRow row in rows)
      {
        //使用反射生成新的实例
        object obj = show.LoadObject("UserName");
        foreach (DataColumn column in dataTable.Columns)
        {
          //根据字段名设置属性值
          show.SetPropertyValue(obj, column.ColumnName, row[column.ColumnName]);
        }
        list.Add(obj);
      }
      return list;
    }
  }
}
  各位如果有兴趣的话,做个类似于hibernate的简化版是完全没问题的。
  下面是测试类:
Code
using System;
using System.Collections.Generic;
using System.Text;
using System.Reflection;
using Model;
using ObjectLoader;
namespace ReflectionTest
{
  class Program
  {
    static void Main(string[] args)
    {
      ShowObject showObj = new ShowObject();
      object obj = showObj.LoadObject("UserInfo");
      Console.WriteLine("实例名:" + obj.GetType().FullName);
      Console.WriteLine("实例的所有公共属性:");
      PropertyInfo[] pInfos = showObj.GetPropertys(obj);
      foreach (PropertyInfo info in pInfos)
      {
        Console.WriteLine(info.GetType() + ":" + info.Name);
      }
      showObj.SetPropertyValue(obj, "UserId", 1);
      showObj.SetPropertyValue(obj, "UserName", "admin");
      Console.WriteLine("设置属性值后的值");
      Console.WriteLine("UserId:" + showObj.GetPropertyValue(obj,"UserId"));
      Console.WriteLine("UserName:" + showObj.GetPropertyValue(obj, "UserName"));
      Console.WriteLine("执行实例的方法:");
      showObj.ExecuteMethod(obj, "Show");
    }
  }
}
 


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