联合主键的情况怎么在DataGrid中利用DataKeys定位记录

比如表中三个字段

key1 int,key2 int,item varchar(50)

前面2个字段联合主键

前台代码：

< asp:DataGrid  id ="DataGrid1"  runat ="server"  AutoGenerateColumns ="False"  DataKeyField ="DoubleKey" >

                 < Columns >

                     < asp:BoundColumn  DataField ="item"  HeaderText ="item" ></ asp:BoundColumn >

                     < asp:ButtonColumn  CommandName ="del"  Text ="删除" ></ asp:ButtonColumn >

                 </ Columns >

             </ asp:DataGrid >

后台代码：

using  System;

using  System.Collections;

using  System.ComponentModel;

using  System.Data;

using  System.Data.SqlClient;

using  System.Drawing;

using  System.Web;

using  System.Web.SessionState;

using  System.Web.UI;

using  System.Web.UI.WebControls;

using  System.Web.UI.HtmlControls;

namespace  csdn2

{

    public class WebForm20 : System.Web.UI.Page

{

        protected System.Web.UI.WebControls.DataGrid DataGrid1;

        private void Page_Load(object sender, System.EventArgs e)

{

            if(!IsPostBack)

{

                SetBind();

            }

        }

        private void SetBind()

{

            SqlConnection conn=new SqlConnection(System.Configuration.ConfigurationSettings.AppSettings["conn"]);

            SqlDataAdapter da=new SqlDataAdapter("select * from doublekey",conn);

            DataSet ds=new DataSet();

            da.Fill(ds);

            DataTable dt=ds.Tables[0];

            DataColumn dc=new DataColumn("DoubleKey",typeof(string),"key1+'#'+key2");

            dt.Columns.Add(dc);

            this.DataGrid1.DataSource=dt;

            this.DataGrid1.DataBind();

        }

        Web 窗体设计器生成的代码#region Web 窗体设计器生成的代码

        override protected void OnInit(EventArgs e)

{

            //

            // CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。

            //

            InitializeComponent();

            base.OnInit(e);

        }

        /// <summary>

        /// 设计器支持所需的方法 - 不要使用代码编辑器修改

        /// 此方法的内容。

        /// </summary>

        private void InitializeComponent()

{    

            this.DataGrid1.ItemCommand += new System.Web.UI.WebControls.DataGridCommandEventHandler(this.DataGrid1_ItemCommand);

            this.Load += new System.EventHandler(this.Page_Load);

        }

        #endregion

        private void DataGrid1_ItemCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)

{

            if(e.CommandName=="del")

{

                SqlConnection conn=new SqlConnection(System.Configuration.ConfigurationSettings.AppSettings["conn"]); 

                SqlCommand comm=new SqlCommand("delete from doublekey where [email protected] and [email protected]",conn); 

                SqlParameter parm1=new SqlParameter("@key1",SqlDbType.Int);

                SqlParameter parm2=new SqlParameter("@key2",SqlDbType.Int); 

                string [] keys=this.DataGrid1.DataKeys[e.Item.ItemIndex].ToString().Split('#');

                parm1.Value=keys[0];

                parm2.Value=keys[1];

                comm.Parameters.Add(parm1);

                comm.Parameters.Add(parm2); 

                conn.Open(); 

                comm.ExecuteNonQuery(); 

                conn.Close(); 

                SetBind(); 

            }

        }

    }

}