GridView and DropDownList

    <form id="form1" runat="server">
     <div>
     <asp:GridView runat="server" ID="gv_KeyList" AutoGenerateColumns="False"
             Width="99%" onrowdeleting="gv_KeyList_RowDeleting">
         <Columns>
             <asp:BoundField DataField="text" HeaderText="Friends" />
             <asp:TemplateField>

                 <ItemTemplate>
                    <asp:DropDownList runat="server" ID="DropDownList1"  DataSource='<%#DDLBind() %>' DataTextField="text" DataValueField="id"> </asp:DropDownList>
                 </ItemTemplate>
             </asp:TemplateField>
             <asp:CommandField ShowDeleteButton="True" />
         </Columns>
         </asp:GridView>
     </div>
     </form>

 if (!IsPostBack)
        {
            DropDownList dll;
            string strSql = "select * from emailreceive where p_id!=1 ";
            string conn = "server=.;database=emailfriends;uid=sa;pwd=123";
            SqlConnection conns = new SqlConnection(conn);
            conns.Open();
            SqlCommand cmd = new SqlCommand(strSql, conns);
            SqlDataAdapter sda = new SqlDataAdapter();
            sda.SelectCommand = cmd;
            DataSet ds = new DataSet();
            sda.Fill(ds, "a");
            gv_KeyList.DataSource = ds.Tables[];
            gv_KeyList.DataBind();

            DataTable dt = DDLBind();

            for (int i = ; i < gv_KeyList.Rows.Count;i++ )
            {
                DataRowView mygv=ds.Tables[].DefaultView[i];
               for(int j=;j<dt.Rows.Count;j++)
               {

                   DataRowView pKeyName = dt.DefaultView[j];
                   if (Convert.ToInt32(mygv["p_id"]) == Convert.ToInt32(pKeyName["id"]))
                   {
                       dll = (DropDownList)gv_KeyList.Rows[i].FindControl("DropDownList1");
                       string id=mygv["p_id"].ToString();
                       dll.SelectedValue = id;
                      }
               }

            }     

                conns.Close();

        }
    }

    public DataTable DDLBind()
    {
        string strSql1 = "select * from emailreceive where p_id=1 ";
        string conn1 = "server=.;database=emailfriends;uid=sa;pwd=123";
        SqlConnection conns1 = new SqlConnection(conn1);
        conns1.Open();
        SqlCommand cmd1 = new SqlCommand(strSql1, conns1);
        SqlDataAdapter sda1 = new SqlDataAdapter();
        sda1.SelectCommand = cmd1;
        DataSet ds1 = new DataSet();
        sda1.Fill(ds1, "a");
        conns1.Close();
        return ds1.Tables[];

    }

    protected void gv_KeyList_RowDeleting(object sender, GridViewDeleteEventArgs e)
    {
        string ddlValues = ((DropDownList)gv_KeyList.Rows[e.RowIndex].Cells[].FindControl("DropDownList1")).SelectedValue;
        Response.Write(ddlValues);
    }
}

三层的前台代码：

    <asp:GridView runat="server" ID="gv_KeyList" Width="99%"
             AutoGenerateColumns="False" onrowdeleting="gv_KeyList_RowDeleting"
             DataKeyNames="I_KeyId" onrowcancelingedit="gv_KeyList_RowCancelingEdit"
             onrowediting="gv_KeyList_RowEditing" onrowupdating="gv_KeyList_RowUpdating">
         <Columns>
             <asp:BoundField DataField="Vc_KeyName" HeaderText="关键词" />
             <asp:TemplateField HeaderText="父关键词">

                 <ItemTemplate>
                    <asp:DropDownList runat="server" ID="ddlPKey" DataSource='<%#ddlBind() %>' DataTextField="Vc_KeyName" DataValueField="I_KeyId"></asp:DropDownList>
                 </ItemTemplate>
             </asp:TemplateField>
             <asp:BoundField DataField="Vc_Url" HeaderText="关键词连接" />
             <asp:CommandField HeaderText="修改" ShowEditButton="True" />
             <asp:CommandField HeaderText="删除" ShowDeleteButton="True" />
         </Columns>
         </asp:GridView>

三层UI层代码：

 chinaOfQiHuo.BLL.Guanjiancixinxi bllKey = new chinaOfQiHuo.BLL.Guanjiancixinxi();

         protected void Page_Load(object sender, EventArgs e)
         {
             if (!IsPostBack)
             {
                 DDL_PKey.DataTextField = "Vc_KeyName";
                 DDL_PKey.DataValueField = "I_KeyId";
                 DDL_PKey.DataSource = ddlBind();
                 DDL_PKey.DataBind();
                  gv_KeyList.DataSource = gvBind();
                  gv_KeyList.DataBind();
                 //绑定ddl
                 DropDownList ddl;
                 for (int i = ; i < gv_KeyList.Rows.Count; i++)
                 {
                     for (int j = ; j < ddlBind().Count; j++)
                     {
                         if (gvBind()[i].I_SuperId == ddlBind()[j].I_KeyId)
                         {
                             ddl = (DropDownList)gv_KeyList.Rows[i].FindControl("ddlPKey");
                             ddl.SelectedValue = gvBind()[i].I_SuperId.ToString();
                         }
                     }
                 }
             }
         }
         public  List<chinaOfQiHuo.Model.Guanjiancixinxi> ddlBind()
         {

             return bllKey.GetDDLPKey();

         }
         public List<chinaOfQiHuo.Model.Guanjiancixinxi> gvBind()
         {
           return  bllKey.GetGVList();
         

三层BLL层代码：

  chinaOfQiHuo.DAL.Guanjiancixinxi dalKey = new DAL.Guanjiancixinxi();
        public bool Add(chinaOfQiHuo.Model.Guanjiancixinxi model,out string Msg)
        {
            if (Exists(model.Vc_KeyName))//已存在关键词
            {
                Msg = "关键词已存在";
                return false;
            }
            else
            {
                int id = ;

                id = dalKey.Add(model);
                if (id > )
                {
                    Msg = "关键词添加成功";
                    return true;
                }
                else {
                    Msg = "添加超时，请重新添加";
                    return false;
                }
            }

        }
        public bool Exists(string keyName)
        {
            return dal.Exists(keyName);
        }
        public List<Model.Guanjiancixinxi> GetDDLPKey()
        {
            return dalKey.GetDDLPKey();
        }
        public List<Model.Guanjiancixinxi> GetGVList()
        {

          return  dalKey.GetGVKeyList();
        }

     }

三层DAL层代码：

  public bool Exists(string keyName)
        {
            StringBuilder strSql = new StringBuilder();
            strSql.Append("select count(1) from tb_Guanjiancixinxi");
            strSql.Append(" where Vc_KeyName = @keyName");
            SqlParameter[] parameters = {
                     new SqlParameter("@keyName", SqlDbType.VarChar,)
             };
            parameters[].Value = keyName;

            return DbHelperSQL.Exists(strSql.ToString(), parameters);
        }
        //绑定父关键字
        public List<Model.Guanjiancixinxi> GetDDLPKey()
        {
            StringBuilder strSql = new StringBuilder();
            strSql.Append("select * from tb_Guanjiancixinxi where I_SuperId=0 ");

            List<Model.Guanjiancixinxi> pKeylist = new List<Model.Guanjiancixinxi>();
           SqlDataReader dr= SqlHelper.ExecuteReader(SqlHelper.SqlConnectionString,CommandType.Text,strSql.ToString(),null);
           while (dr.Read())
           {
               Model.Guanjiancixinxi model = new Model.Guanjiancixinxi();
               model.Vc_KeyName = dr["Vc_KeyName"].ToString();
               model.I_KeyId = Convert.ToInt32(dr["I_KeyId"]);
               pKeylist.Add(model);
           }
           return pKeylist;
        }
      //获取关键字列表
        public List<Model.Guanjiancixinxi> GetGVKeyList()
        {
            string strSql = "select I_KeyId,I_SuperId,Vc_KeyName,Vc_Url FROM tb_Guanjiancixinxi where I_SuperId!=0";
            SqlDataReader dr = SqlHelper.ExecuteReader(SqlHelper.SqlConnectionString,CommandType.Text,strSql,null);
            List<Model.Guanjiancixinxi> gvList = new List<Model.Guanjiancixinxi>();
            while (dr.Read())
            {
                Model.Guanjiancixinxi model = new Model.Guanjiancixinxi();
                model.Vc_KeyName = dr["Vc_KeyName"].ToString();
                model.PKeyName = GetPKeyName(Convert.ToInt32(dr["I_SuperId"]));
                model.I_SuperId = Convert.ToInt32(dr["I_SuperId"]);
                model.I_KeyId = Convert.ToInt16(dr["I_KeyId"]);
                model.Vc_Url = dr["Vc_Url"].ToString();
                gvList.Add(model);
            }
            return gvList;
        }
        private string GetPKeyName(int superId)
        {
            string strSql = "select Vc_KeyName from tb_Guanjiancixinxi where I_KeyId =@superId";
            SqlParameter[] spt = new SqlParameter[] { new SqlParameter("@superId", SqlDbType.Int) { Value = superId } };
            object obj = SqlHelper.ExecuteScalar(SqlHelper.SqlConnectionString, CommandType.Text, strSql,spt);
            return obj.ToString();
        }
     }

GridView与DropDownList的混合使用