datagridview 点击列标题排序

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：

 

public  class  SortableBindingList : BindingList
    {
        private  bool  isSortedCore =  true ;
        private  ListSortDirection sortDirectionCore = ListSortDirection.Ascending;
        private  PropertyDescriptor sortPropertyCore =  null ;
        private  string  defaultSortItem;

        public  SortableBindingList() :  base () { }

        public  SortableBindingList(IList 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 list = ( this .Items  as  List);
            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());
        }
    }

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