SCPBJBQ/北京北汽/Utils/SortableBindingList.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Reflection;

namespace ChangkeTec.Utils
{
    public class SortableBindingList<T> : BindingList<T>
    {
        private bool _isSortedCore = true;
        private ListSortDirection _sortDirectionCore = ListSortDirection.Ascending;
        private PropertyDescriptor _sortPropertyCore = null;
        private string _defaultSortItem;

        public SortableBindingList() : base() { }

        public SortableBindingList(IList<T> list) : base(list) { }

        protected override bool SupportsSortingCore
        {
            get { return true; }
        }

        protected override bool SupportsSearchingCore
        {
            get { return true; }
        }

        protected override bool IsSortedCore
        {
            get { return _isSortedCore; }
        }

        protected override ListSortDirection SortDirectionCore
        {
            get { return _sortDirectionCore; }
        }

        protected override PropertyDescriptor SortPropertyCore
        {
            get { return _sortPropertyCore; }
        }

        protected override int FindCore(PropertyDescriptor prop, object key)
        {
            for (int i = 0; i < Count; i++)
            {
                if (Equals(prop.GetValue(this[i]), key)) return i;
            }
            return -1;
        }

        protected override void ApplySortCore(PropertyDescriptor prop, ListSortDirection direction)
        {
            _isSortedCore = true;
            _sortPropertyCore = prop;
            _sortDirectionCore = direction;
            Sort();
        }

        protected override void RemoveSortCore()
        {
            if (_isSortedCore)
            {
                _isSortedCore = false;
                _sortPropertyCore = null;
                _sortDirectionCore = ListSortDirection.Ascending;
                Sort();
            }
        }

        public string DefaultSortItem
        {
            get { return _defaultSortItem; }
            set
            {
                if (_defaultSortItem != value)
                {
                    _defaultSortItem = value;
                    Sort();
                }
            }
        }

        private void Sort()
        {
            List<T> list = (Items as List<T>);
            list.Sort(CompareCore);
            ResetBindings();
        }

        private int CompareCore(T o1, T o2)
        {
            int ret = 0;
            if (SortPropertyCore != null)
            {
                ret = CompareValue(SortPropertyCore.GetValue(o1), SortPropertyCore.GetValue(o2), SortPropertyCore.PropertyType);
            }
            if (ret == 0 && DefaultSortItem != null)
            {
                PropertyInfo property = typeof(T).GetProperty(DefaultSortItem, BindingFlags.Public | BindingFlags.GetProperty | BindingFlags.Instance | BindingFlags.IgnoreCase, null, null, new Type[0], null);
                if (property != null)
                {
                    ret = CompareValue(property.GetValue(o1, null), property.GetValue(o2, null), property.PropertyType);
                }
            }
            if (SortDirectionCore == ListSortDirection.Descending) ret = -ret;
            return ret;
        }

        private static int CompareValue(object o1, object o2, Type type)
        {

            if (o1 == null) return o2 == null ? 0 : -1;
            else if (o2 == null) return 1;
            else if (type.IsPrimitive || type.IsEnum) return Convert.ToDouble(o1).CompareTo(Convert.ToDouble(o2));
            else if (type == typeof(DateTime)) return Convert.ToDateTime(o1).CompareTo(o2);
            else return String.CompareOrdinal(o1.ToString().Trim(), o2.ToString().Trim());
        }
    }
}