新建类
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) { //MessageBox.Show(type.GetType().ToString()); if (o1 == null) return o2 == null ? 0 : -1; if (o2 == null) return 1; if (type.ToString().Contains("Int")) return Convert.ToDouble(o1).CompareTo(Convert.ToDouble(o2));//注意这里if
(type.IsPrimitive || type.IsEnum)是取不到Int型的
if (type == typeof(DateTime)) return Convert.ToDateTime(o1).CompareTo(o2); return String.Compare(o1.ToString().Trim(), o2.ToString().Trim()); } 使用:(直接把查询出来的List<>扔进去即可)
dataGridView1.DataSource = new App_Code.SortableBindingList<App_Code.WordCount>(new App_Code.WorldCountDA().SelectAll());
还没试过日期
时间: 2024-10-10 02:32:46