泛型排序源码

代码
   
using System.Reflection;
using System.Collections;
 
/**/
    
/// <summary>
    
/// 继承IComparer<T>接口,实现同一自定义类型 对象比较
    
/// </summary>
    
/// <typeparam name="T">T为泛用类型</typeparam>
    public class Reverser<T> : IComparer<T>
    {
        
private Type type = null;
        
private ReverserInfo info;

        
/**/
        
/// <summary>
        
/// 构造函数
        
/// </summary>
        
/// <param name="type">进行比较的类类型</param>
        
/// <param name="name">进行比较对象的属性名称</param>
        
/// <param name="direction">比较方向(升序/降序)</param>
        public Reverser(Type type, string name, ReverserInfo.Direction direction)
        {
            
this.type = type;
            
this.info.name = name;
            
if (direction != ReverserInfo.Direction.ASC)
                
this.info.direction = direction;
        }

        
/**/
        
/// <summary>
        
/// 构造函数
        
/// </summary>
        
/// <param name="className">进行比较的类名称</param>
        
/// <param name="name">进行比较对象的属性名称</param>
        
/// <param name="direction">比较方向(升序/降序)</param>
        public Reverser(string className, string name, ReverserInfo.Direction direction)
        {
            
try
            {
                
this.type = Type.GetType(className, true);
                
this.info.name = name;
                
this.info.direction = direction;
            }
            
catch (Exception e)
            {
                
throw new Exception(e.Message);
            }
        }

        
/**/
        
/// <summary>
        
/// 构造函数
        
/// </summary>
        
/// <param name="t">进行比较的类型的实例</param>
        
/// <param name="name">进行比较对象的属性名称</param>
        
/// <param name="direction">比较方向(升序/降序)</param>
        public Reverser(T t, string name, ReverserInfo.Direction direction)
        {
            
this.type = t.GetType();
            
this.info.name = name;
            
this.info.direction = direction;
        }

        
//必须!实现IComparer<T>的比较方法。
        int IComparer<T>.Compare(T t1, T t2)
        {
            
object x = this.type.InvokeMember(this.info.name, BindingFlags.Public | BindingFlags.Instance | BindingFlags.GetProperty, null, t1, null);
            
object y = this.type.InvokeMember(this.info.name, BindingFlags.Public | BindingFlags.Instance | BindingFlags.GetProperty, null, t2, null);
            
if (this.info.direction != ReverserInfo.Direction.ASC)
                Swap(
ref x, ref y);
            
return (new CaseInsensitiveComparer()).Compare(x, y);
        }

        
//交换操作数
        private void Swap(ref object x, ref object y)
        {
            
object temp = null;
            temp 
= x;
            x 
= y;
            y 
= temp;
        }
    }

    
/**/
    
/// <summary>
    
/// 对象比较时使用的信息类
    
/// </summary>
    public struct ReverserInfo
    {
        
/**/
        
/// <summary>
        
/// 比较的方向,如下:
        
/// ASC:升序
        
/// DESC:降序
        
/// </summary>
        public enum Direction
        {
            ASC 
= 0,
            DESC,
        }

        
public enum Target
        {
            CUSTOMER 
= 0,
            FORM,
            FIELD,
            SERVER,
        }

        
public string name;
        
public Direction direction;
        
public Target target;
    }

调用方法

 MotoBrandModel p = new MotoBrandModel();
            Reverser<MotoBrandModel> reverser = new Reverser<MotoBrandModel>(p.GetType(), "F_Sort", ReverserInfo.Direction.ASC);
          
           // Reverser<MotoBrandModel> reverser = new Reverser<MotoBrandModel>(p.GetType(), "F_Sort", ReverserInfo.Direction.DESC);
            list.Sort(reverser);
            return list;

posted @ 2010-03-31 00:48  Mating_luo  阅读(211)  评论(0)    收藏  举报