记录C#控件DataGridView绑定BindingList无法排序问题（转）

本文在网络上搜集到的资料，自己改了一下类名而已，致谢。

public class FlexibleBindingList<T> : BindingList<T> {
    private bool isSortedCore = true;
    private ListSortDirection sortDirectionCore = ListSortDirection.Ascending;
    private PropertyDescriptor sortPropertyCore = null;
    private string defaultSortItem;
    public FlexibleBindingList() : base() { }
    public FlexibleBindingList(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 < this.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 = (this.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) {
        //这里改成自己定义的比较
        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.Compare(o1.ToString().Trim(), o2.ToString().Trim());
    }
}