- 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)
- {
- //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());
- }
- }
DataGridView 绑定List 时 排序问题的解决
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转载自blog.csdn.net/player26/article/details/3136251
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