GridView點擊排序時帶小圖片

排序

using  System;
using  System.Data;
using  System.Configuration;
using  System.Collections;
using  System.Web;
using  System.Web.Security;
using  System.Web.UI;
using  System.Web.UI.WebControls;
using  System.Web.UI.WebControls.WebParts;
using  System.Web.UI.HtmlControls;

using  System.Data.OleDb;
public   partial   class  Sorting : System.Web.UI.Page
{
     protected   void  Page_Load( object  sender, EventArgs e)
    {
         if  ( ! IsPostBack)
        {
             this .BindGridView();
        }
    }
     ///   <summary>
     ///  綁定gridview
     ///   </summary>
     public   void  BindGridView()
    {

         string  sql  =   " select * from tb_test " ;
         // 獲取gridview排序的數據列及其方向
         string  sortExpression  =   this .GridView1.Attributes[ " SortExpression " ];
         string  sortDirection  =   this .GridView1.Attributes[ " SortDirection " ];
         // 調用方法
        DataTable dt  =   new  DataTable();
        dt  =  OracleHelper.getDB(sql);
         if  (( ! string .IsNullOrEmpty(sortExpression))  &&  ( ! string .IsNullOrEmpty(sortDirection)))
        {
            dt.DefaultView.Sort  =   string .Format( " {0} {1} " , sortExpression, sortDirection);
        }
         // GridView綁定并顯示數據
         this .GridView1.DataSource  =  dt;
         this .GridView1.DataBind();


    }

     ///   <summary>
     ///  排序
     ///   </summary>
     ///   <param name="sender"></param>
     ///   <param name="e"></param>
     protected   void  GridView1_Sorting( object  sender, GridViewSortEventArgs e)
    {
         // 從事件參數中獲取排序的數據列
         string  sortExpression  =  e.SortExpression.ToString();
         // 假定排序方向為‘順序’
         string  sortDirection  =   " ASC " ;
         // 'ASC' 與從時間參數獲取的排序方向相比較，進行gridview排序方向的修改
         if  (sortExpression  ==   this .GridView1.Attributes[ " SortExpression " ])
        {
             // 獲取下一次排序狀態
            sortDirection  =  ( this .GridView1.Attributes[ " SortDirection " ].ToString()  ==  sortDirection  ?   " DESC "  :  " ASC " );
        }
         //  重新设定GridView排序数据列及排序方向
         this .GridView1.Attributes[ " SortExpression " ]  =  sortExpression;
         this .GridView1.Attributes[ " SortDirection " ]  =  sortDirection;
         this .BindGridView();

        GridViewRow headerRow  =  GridView1.HeaderRow;
        Image sortImage  =   new  Image();
         if  (sortDirection  ==   " ASC " )
        {
            sortImage.ImageUrl  =   " images/hmenu-asc.gif " ;
            sortImage.Style.Add( " vertical-align " ,  " bottom " );
        }
         else
        {
            sortImage.ImageUrl  =   " images/hmenu-desc.gif " ;
            sortImage.Style.Add( " vertical-align " ,  " bottom " );
        }
         int  num  =   0 ;
         foreach  (DataControlField field  in  GridView1.Columns)
        {
             if  (field.SortExpression  ==  sortExpression.ToString().Trim())
            {
                num  =  GridView1.Columns.IndexOf(field);
            }
        }
        headerRow.Cells[num].Controls.Add(sortImage);
      
    }
}

 

OracleHelper.getDB()方法

    public   static  DataTable getDB( string  sql)
    {
        DataTable dt  =   new  DataTable();
         using  (OleDbConnection conn  =   new  OleDbConnection(ConnString))
        {
            OleDbDataAdapter comm  =   new  OleDbDataAdapter(sql, conn);
            DataSet ds  =   new  DataSet();
             try
            {
                conn.Open();
                ds.Clear();
                comm.Fill(ds);
                dt  =  ds.Tables[ 0 ];

            }
             catch
            {
                conn.Close();
            }
             finally
            {
                conn.Close();
            }
             return  dt;
        }

    }