调整数据列表内的顺序

 调整数据列表内的顺序，现写成扩展方法工具类

public static class CollectionHelper {     //交换List项的顺序     public static bool ExchangeOrder<T>(this IList<T> list, int sourceID, int newID)     {         if (sourceID >= list.Count || sourceID < 0 || newID >= list.Count || newID < 0 || sourceID == newID) return false;         try         {             var temp = list[sourceID];             list[sourceID] = list[newID];             list[newID] = temp;             return true;         }         catch (Exception)         {             return false;         }     }       /// <summary>     /// 向上移动     /// </summary>     /// <typeparam name="T"></typeparam>     /// <param name="list">The 数据列表 list</param>     /// <param name="id">The 需要移动的id</param>     /// <param name="num">The 移动的 位数. 默认为1, 几位就向上移动几位</param>     /// <returns></returns>     public static bool MoveUpper<T>(this IList<T> list, int id, int num = 1)     {         return list.MoveItem(id, id - num);     }       //向下移动     public static bool MoveDown<T>(this IList<T> list, int id, int num = 1)     {         return list.MoveItem(id, id + num);     }       //移动到顶部     public static bool MoveTopper<T>(this IList<T> list, int id)     {         return list.MoveItem(id, 0);     }       //移动到底部     public static bool MoveBottom<T>(this IList<T> list, int id)     {         return list.MoveItem(id, list.Count -1);     }       /// <summary>     /// 移动     /// </summary>     /// <typeparam name="T"></typeparam>     /// <param name="list">数据列表</param>     /// <param name="sourceID">原来的数据ID</param>     /// <param name="newID">移动后数据ID</param>     /// <returns></returns>     public static bool MoveItem<T>(this IList<T> list, int sourceID, int newID)     {         if (sourceID >= list.Count || sourceID < 0 || newID >= list.Count || newID < 0 || sourceID == newID) return false;         try         {             var temp = list[sourceID];             list.RemoveAt(sourceID);             list.Insert(newID, temp);             return true;         }         catch (Exception)         {             return false;         }     } }

 

 

调用的方法：

class CollectionSample {       public void Test()     {         List<Student> stuList = new List<Student>();         Student stu = new Student(1, "zhangSan");         stuList.Add(stu);         stu = new Student(2, "LiSi");         stuList.Add(stu);         stu = new Student(3, "WangWu");         stuList.Add(stu);         stu = new Student(4, "ZhangLiu");         stuList.Add(stu);         string msg = string.Empty;         foreach (Student item in stuList)         {             msg += String.Format("ID: {0}, Name: {1} ", item.id, item.name);         }         //Exchange(stuList);         Move(stuList);     }       private static void Exchange(List<Student> stuList)     {         CollectionHelper.ExchangeOrder(stuList, 2, 1);           string newMsg = string.Empty;         foreach (Student item in stuList)         {             newMsg += String.Format("ID: {0}, Name: {1} ", item.id, item.name);         }     }       private static void Move(List<Student> stuList)     {         CollectionHelper.MoveUpper(stuList, 2, 3);           string newMsg = string.Empty;         foreach (Student item in stuList)         {             newMsg += String.Format("ID: {0}, Name: {1} ", item.id, item.name);         }     } }

 

 

本文转自Work Hard Work Smart博客园博客，原文链接：http://www.cnblogs.com/linlf03/archive/2012/06/18/2553360.html，如需转载请自行联系原作者