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！

　　/// <summary>
    /// 算法帮助类
    /// 作者：仓储大叔
    /// </summary>
    public class AlgorithmsHelper
    {
        /// <summary>
        /// 排序，上移和下移
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="list"></param>
        /// <param name="id"></param>
        /// <param name="newSort"></param>
        public static void Sortable_Up_Down<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 += ;
                }

            }
            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 -= ;
                }
            }
            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=,Name="zzl",SortNumber=});
            list.Add (new Person {ID=,Name="zzl2",SortNumber=});
            list.Add (new Person {ID=,Name="zzl3",SortNumber=});

            Console.WriteLine ("Hello World!");
            Extenstion.Sortable (list, , );
            Extenstion.Sortable (list, , );

        }
    }

单元测试里的结果如图

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感谢各位中秋阅读！