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using System;
using System.Collections.Generic;
using System.Text;
using System.Reflection;
using System.Collections;
namespace Misc
{
/// <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="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 name, ReverserInfo.Direction direction)
{
this.type = typeof(T);
this.info.name = name;
if (direction != ReverserInfo.Direction.ASC)
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;
}
}