Gridview自定義排序且顯示上下箭頭

作者: 銳意來源: 博客園發布時間: 2009-04-15 17:01 閱讀: 6852 次推薦: 0 原文鏈接 [收藏]

實現功能：單擊Gidview列名按該列升序或降序排列，且在排序列上顯示向上來向下箭頭示意圖片

//設置Gridview的AllowSorting屬性值為true,即允許排序
AllowSorting="True" OnSorting="gridview1_Sorting" OnRowCreated="gridview1_RowCreated" >

//為要排序的列加上SortExpression屬性,其值為綁定的字段,如：
SortExpression="ID">

//添加Sorting和RowCreated事件
OnSorting="gridview1_Sorting" OnRowCreated="gridview1_RowCreated" >

后臺代碼,創建如下方法：

         //設置默認表達式和排序順序,放到page_load事件中
        public void SetSorting()
        {
            ViewState["SortExpression"] = "ID";
            ViewState["SortDirection"] = SortDirection.Descending;

}

        //獲取排序列索引
        private int GetSortColumnIndex()
        {
            foreach (DataControlField field in gridview1.Columns)
            {
                if (field.SortExpression == ViewState["SortExpression"].ToString().Trim())
                    return gridview1.Columns.IndexOf(field);
            }
            return -1;
        }

        //添加排序圖片
        private void AddSortImage(int columnIndex, GridViewRow headerRow)
        {
            Image sortImage = new Image();
            if ((SortDirection)ViewState["SortDirection"] == SortDirection.Ascending)
            {
                sortImage.ImageUrl ="向上箭頭圖片的路徑";
            }
            else
            {
                sortImage.ImageUrl = "向下箭頭圖片的路徑";
            }

            headerRow.Cells[columnIndex].Controls.Add(sortImage);
        }

      //Gridview的Sorting事件
      protected void gridview1_Sorting(object sender, GridViewSortEventArgs e)
     {
        if (ViewState["SortExpression"].ToString().Trim() == e.SortExpression)
        {
            if ((SortDirection)ViewState["SortDirection"] == SortDirection.Ascending)
                ViewState["SortDirection"] = SortDirection.Descending;
            else
                ViewState["SortDirection"] = SortDirection.Ascending;
        }
        else
        {
            ViewState["SortExpression"] = e.SortExpression;
            ViewState["SortDirection"] = SortDirection.Descending;
        }

        //你綁定Gridview數據的函數
        GvBind();
    }
    //Gridview的RowCreated事件
    protected void gridview1_RowCreated(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.Header)
        {
            int sortColumnIndex = GetSortColumnIndex();