* ClassName: IListSort<T>
* Description: IList排序类
* MemberVariable:
* Functions: 暂时使用插入排序方法
* Modify information:
* Date ModifyFlag Charged by Description
* 2008-7-31 New YangWenBing Create Class
*
* ********************************************************************************/
using System;
using System.Collections.Generic;
using System.Text;
using System.Reflection;
namespace Business.common
{
/// <summary>
/// IList排序类
/// </summary>
/// <typeparam name="T"></typeparam>
public class IListSort<T>
{
private string _propertyName;
private bool _sortBy = true;
private IList<T> _list;
/// <summary>
/// 构造函数
/// </summary>
/// <param name="list">排序的Ilist</param>
/// <param name="propertyName">排序字段属性名</param>
/// <param name="sortBy">true升序 false 降序 不指定则为true</param>
public IListSort(IList<T> list, string propertyName, bool sortBy)
{
_list = list;
_propertyName = propertyName;
_sortBy = sortBy;
}
/// <summary>
/// 构造函数
/// </summary>
/// <param name="list">排序的Ilist</param>
/// <param name="propertyName">排序字段属性名</param>
/// <param name="sortBy">true升序 false 降序 不指定则为true</param>
public IListSort(IList<T> list, string propertyName)
{
_list = list;
_propertyName = propertyName;
_sortBy = true;
}
/// <summary>
/// IList
/// </summary>
public IList<T> List
{
get { return _list; }
set { _list = value; }
}
/// <summary>
/// 排序字段属性名
/// </summary>
public string PropertyName
{
get { return _propertyName; }
set { _propertyName = value; }
}
/// <summary>
/// true升序 false 降序
/// </summary>
public bool SortBy
{
get { return _sortBy; }
set { _sortBy = value;}
}
/// <summary>
/// 排序，插入排序方法
/// </summary>
/// <returns></returns>
public IList<T> Sort()
{
if (_list.Count == 0) return _list;
for (int i = 1; i < _list.Count; i++) {
T t = _list[i];
int j = i;
while ((j > 0) && Compare(_list[j - 1], t) < 0) {
_list[j] = _list[j - 1];
--j;
}
_list[j] = t;
}
return _list;
}
/// <summary>
/// 比较大小 返回值 小于零则X小于Y，等于零则X等于Y，大于零则X大于Y
/// </summary>
/// <param name="x"></param>
/// <param name="y"></param>
/// <returns></returns>
private int Compare(T x, T y)
{
if (string.IsNullOrEmpty(_propertyName)) throw new ArgumentNullException("没有指字对象的排序字段属性名!");
PropertyInfo property = typeof( T ).GetProperty(_propertyName);
if (property == null) throw new ArgumentNullException("在对象中没有找到指定属性!");
switch (property.PropertyType.ToString()) {
case "System.Int32" :
int int1 = 0;
int int2 = 0;
if (property.GetValue(x, null) != null) {
int1 = Convert.ToInt32(property.GetValue(x, null));
}
if (property.GetValue(y, null) != null) {
int2 = Convert.ToInt32(property.GetValue(y, null));
}
if (_sortBy) {
return int2.CompareTo(int1);
}
else {
return int1.CompareTo(int2);
}
break;
case "System.Double":
double double1 = 0;
double double2 = 0;
if (property.GetValue(x, null) != null) {
double1 = Convert.ToDouble(property.GetValue(x, null));
}
if (property.GetValue(y, null) != null) {
double2 = Convert.ToDouble(property.GetValue(y, null));
}
if (_sortBy) {
return double2.CompareTo(double1);
}
else {
return double1.CompareTo(double2);
}
break;
case "System.String" :
string string1 = string.Empty;
string string2 = string.Empty;
if (property.GetValue(x, null) != null) {
string1 = property.GetValue(x, null).ToString();
}
if (property.GetValue(y, null) != null) {
string2 = property.GetValue(y, null).ToString();
}
if (_sortBy) {
return string2.CompareTo(string1);
}
else {
return string1.CompareTo(string2);
}
break;
case "System.DateTime":
DateTime DateTime1 = DateTime.Now;
DateTime DateTime2 = DateTime.Now;
if (property.GetValue(x, null) != null) {
DateTime1 = Convert.ToDateTime(property.GetValue(x, null));
}
if (property.GetValue(y, null) != null) {
DateTime2 = Convert.ToDateTime(property.GetValue(y, null));
}
if (_sortBy) {
return DateTime2.CompareTo(DateTime1);
}
else {
return DateTime1.CompareTo(DateTime2);
}
break;
}
return 0;
}
}
}
调用：
this.GridView1.DataSource = new IListSort<MVote>(list, "SortOrder").Sort();
this.GridView1.DataBind();