高手请进：为什么DataGridView绑定集合后不能排序？
如题，我用一个List<xxx> 的泛型对象跟一个datagridview 绑定（用DataSource）,没问题，数据也显示出来了。
但奇怪的是，在点列标头的时候，不能排序了。不知道大家有没遇到过这样的问题，怎么解决？
[解决办法]
写一个SortableBindingList <T> :BindingList <T> ，把需要排序的List <T> 改成用SortableBindingList <T>
SortableBindingList的完整代码如下，使用时如下：
DataSet ds = ToDataSet<UserInfo>(test.GetUserInfoCollection());
SortableBindingList<UserInfo> list = DataSetToIList<UserInfo>(ds, 0);//要排序的List<T>改成SortableBindingList就可以了
dataGridView1.DataSource = list;
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 < 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) { 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()); } }