datagridview 點擊列標題排序

開發winform中，平時經常用到數據列表，我們大多選用datagridview，但是此控件本身沒有排序的功能。參閱網上資料。留下標記，以后備用。

datagridview的數據顯示一般是通過數據綁定來實現，

 即：this.datagridview.DataSource=this.bindingSrc;

      this.bindingSrc.DataSource=this.Model;

 

這種形式就完成了，數據的顯示過程。但是要實現點擊datagridview實現排序的功能，需要實現對數據源排序的功能。具體代碼如下：

 

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());
        }
    } 

 實現此類后，就可以通過 this.bindingSrc.DataSource=new SortableBindingList<CnsDetailReport>(this.Model); 實現點擊列標題排序的目的了。