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[ASP.net教程]Lind.DDD.Domain.ISortBehavor~上移与下移

在进行列表排序时,有个“上移”和“下移”操作,这个一般在内存里完成,然后统一提交到数据库中,对于上移与下移的设计,大叔在LIND.DDD.DOMAIN里有一个ISortBehavor接口,主要是说,如果实体对象支持排序功能,可以实现这个接口,而在扩展库中,将有为本地结果集动态排序(上移和下移)的方法,这个设计类似于ABP项目里的软删除,当然在大叔LIND里也有对删除的逻辑操作。

ISortBehavor内容

class Entity { public int ID{ get; set; } }interface ISortBehavor { int SortNumber{ get; set; } }

而上移与下移我们使用一个泛型方法来接收参数,这样扩展性更好一些,开发人员只要把需要上下移的集合传到方法里,之后你的集合就可以被排序,当然这里面会进行各个元素的移动操作!

  class Extenstion  {    /// <summary>    /// Sortable the specified list, id and newSort.    /// </summary>    /// <param name='list'>    /// List.    /// </param>    /// <param name='id'>    /// Identifier.    /// </param>    /// <param name='newSort'>    /// New sort.    /// </param>    /// <typeparam name='T'>    /// The 1st type parameter.    /// </typeparam>    public static void Sortable<T> (List<T> list, int id, int newSort) where T:class    {      var old = list.Find (i => (i as Entity).ID == id);      if (old == null || (old as ISortBehavor).SortNumber == newSort)        return;      if ((old as ISortBehavor).SortNumber > newSort) {        (old as ISortBehavor).SortNumber = newSort;        foreach (ISortBehavor item in  list.FindAll(i=>(i as Entity).ID!=id && (i as ISortBehavor).SortNumber>=newSort)) {          item.SortNumber += 1;        }            } else {        (old as ISortBehavor).SortNumber = newSort;              foreach (ISortBehavor item in  list.FindAll(i=>(i as Entity).ID!=id && (i as ISortBehavor).SortNumber<=newSort)) {          item.SortNumber -= 1;        }      }      list.ForEach (i => {        Console.WriteLine ((i as Entity).ID + "sort:" + (i as ISortBehavor).SortNumber);      }      );    }  }

我们测试一下程序,看一下神奇的结果

  class MainClass  {    public static void Main (string[] args)    {      List<Person> list = new List<Person> ();      list.Add (new Person {ID=1,Name="zzl",SortNumber=1});      list.Add (new Person {ID=2,Name="zzl2",SortNumber=2});      list.Add (new Person {ID=3,Name="zzl3",SortNumber=3});      Console.WriteLine ("Hello World!");      Extenstion.Sortable (list, 1, 2);      Extenstion.Sortable (list, 2, 3);    }  }
感谢各位中秋阅读!