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datagridview 点击列标题排序

时间:2018-08-20 19:44:14      阅读:212      评论:0      收藏:0      [点我收藏+]

标签:tor   cells   stat   rtc   value   desc   cti   this   items   

开发winform中,平时经常用到数据列表,我们大多选用datagridview,但是此控件本身没有排序的功能。参阅网上资料。留下标记,以后备用。

datagridview的数据显示一般是通过数据绑定来实现,

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

      this.bindingSrc.DataSource=this.Model;

 

这种形式就完成了,数据的显示过程。但是要实现点击datagridview实现排序的功能,需要实现对数据源排序的功能。具体代码如下:

 

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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, nullnullnew 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 == nullreturn o2 == null ? 0 : -1;
            else if (o2 == nullreturn 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());
        }
    }

 实现此类后,就可以通过 this.bindingSrc.DataSource=new SortableBindingList<CnsDetailReport>(this.Model); 实现点击列标题排序的目的了。

datagridview 点击列标题排序

标签:tor   cells   stat   rtc   value   desc   cti   this   items   

原文地址:https://www.cnblogs.com/soundcode/p/9507506.html

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