C#将集合快速排序

C#实现集合排序类。

说明：

1、集合类型参数化；

2、可根据集合中的对象的各个属性进行排序，传入属性名称即可；

注：属性必须实现了IComparable接口，C#中int、datetime、string等基本类型都已经实现了IComparable接口。

/// <summary>
/// 对集合进行排序，如
/// List<User> users=new List<User>(){.......}
/// ListSorter.SortList<list<User>,User>(ref users,"Name",SortDirection.Ascending);
/// </summary>
public class ListSorter
{
public static void SortList<TCollection, TItem>(ref TCollection list, string property, SortDirection direction) where TCollection : IList<TItem>
{
PropertyInfo[] propertyinfos = typeof(TItem).GetProperties();
foreach (PropertyInfo propertyinfo in propertyinfos)
{
if (propertyinfo.Name == property)          //取得指定的排序属性
// http://www.cnblogs.com/sosoft/ {
QuickSort<TCollection, TItem>(ref list, 0, list.Count - 1, propertyinfo, direction);
}
}
}
/// <summary>
/// 快速排序算法
/// </summary>
/// <typeparam name="TCollection">集合类型，需要实现Ilist<T>集合</typeparam>
/// <typeparam name="TItem">集合中对象的类型</typeparam>
/// <param name="list">集合对象</param>
/// <param name="left">起始位置，从0开始</param>
/// <param name="right">终止位置</param>
/// <param name="propertyinfo">集合中对象的属性，属性必须要实现IComparable接口</param>
/// <param name="direction">排序类型（升序或降序）</param>
private static void QuickSort<TCollection, TItem>(ref TCollection list, int left, int right, PropertyInfo propertyinfo, SortDirection direction) where TCollection : IList<TItem>
{
if (left < right)
{
int i = left, j = right;
TItem key = list[left];
while (i < j)
{
if (direction == SortDirection.Ascending)
{
while (i < j && ((IComparable)propertyinfo.GetValue(key, null)).CompareTo((IComparable)propertyinfo.GetValue(list[j], null)) < 0)
{
j--;
}
if (i < j)
{
list[i] = list[j];
i++;
}

while (i < j && ((IComparable)propertyinfo.GetValue(key, null)).CompareTo((IComparable)propertyinfo.GetValue(list[i], null)) > 0)
{
i++;
}
if (i < j)
{
list[j] = list[i];
j--;
}
list[i] = key;
}
else
{
while (i < j && ((IComparable)propertyinfo.GetValue(key, null)).CompareTo((IComparable)propertyinfo.GetValue(list[j], null)) > 0)
{
j--;
}
if (i < j)
{
list[i] = list[j];
i++;
}

while (i < j && ((IComparable)propertyinfo.GetValue(key, null)).CompareTo((IComparable)propertyinfo.GetValue(list[i], null)) < 0)
{
i++;
}
if (i < j)
{
list[j] = list[i];
j--;
}
list[i] = key;
}
}
//执行递归调用
QuickSort<TCollection, TItem>(ref list, left, i - 1, propertyinfo, direction);
QuickSort<TCollection, TItem>(ref list, i + 1, right, propertyinfo, direction);
}
}
}
/// <summary>
/// 排序类型
/// </summary>
public enum SortDirection
{
Ascending,
Descending
}