动态添加GridView模板

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<%...@ Page Language="C#" %>
<%...@ Import Namespace="System.Data" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

   public class GridViewTemplate : ITemplate
   ...{
     private DataControlRowType templateType;
     private string columnName;

     public GridViewTemplate( DataControlRowType type, string colname )
     ...{
       templateType = type;
       columnName = colname;
     }

     public void InstantiateIn( System.Web.UI.Control container )
     ...{
       switch (templateType)
       ...{
         case DataControlRowType.Header:
           Literal lc = new Literal();
           lc.Text = columnName;
           container.Controls.Add(lc);
           break;
         case DataControlRowType.DataRow:
           DropDownList drr = new DropDownList();
           drr.ID = "dropdown";
           drr.AppendDataBoundItems = true;
           drr.Items.Add(new ListItem("-----请选择------",""));
           drr.Items.Add(new ListItem("AA", "a"));
           drr.Items.Add(new ListItem("BB", "b"));
           drr.Items.Add(new ListItem("CC", "c"));
           container.Controls.Add(drr);
           break;
         default:
          break;
       }
     }
   }

   protected void Page_Load(object sender, EventArgs e)
   ...{
     if (!IsPostBack)
     ...{
       TemplateField customField = new TemplateField();
       customField.ShowHeader = true;
       customField.HeaderTemplate = new GridViewTemplate(DataControlRowType.Header, "动态添加列");
       customField.ItemTemplate = new GridViewTemplate(DataControlRowType.DataRow, "");
       GridView1.Columns.Add(customField);
       GridView1.DataSource = CreateDataSource();
       GridView1.DataBind();
     }
   }

   protected void GridView1_RowDataBound( object sender, GridViewRowEventArgs e )
   ...{
     if (e.Row.RowType == DataControlRowType.DataRow)
     ...{
       //可以在这里访问数据库的其它字段的值，可以设置默认选择项，具体应用，看自己的发挥了。
       //下面只是例子，举一反三，不再费话了
       DataRowView gv = (DataRowView)e.Row.DataItem;
       int itemSeleted = Int32.Parse(gv.Row["id"].ToString()) > 3 ? 0 : Int32.Parse(gv.Row["id"].ToString());
       DropDownList dr = (DropDownList)e.Row.FindControl("dropdown");
       dr.SelectedIndex = itemSeleted;
     }
   }
</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
   <title>GridView动态添加模板列的例子</title>
</head>
<body>
<form id="form1" runat="server">
   <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"
      OnRowDataBound="GridView1_RowDataBound">
     <Columns>
       <asp:BoundField HeaderText="标题"   DataField="text"/>
     </Columns>
   </asp:GridView>
</form>
</body>
</html>