动态添加GridView模板列 -- 生活就是扯淡-- 编程爱好者博客

代码
<%@ 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">

<script runat="server">
   ICollection CreateDataSource()
    {
     DataTable dt = new DataTable();
     DataRow dr;
     dt.Columns.Add(new DataColumn("id", typeof(Int32)));
     dt.Columns.Add(new DataColumn("text", typeof(string)));
     for (int i = 0; i < 6; i++)
      {
       dr = dt.NewRow();
       dr[0] = i;
       dr[1] = "列表项目 " + i.ToString();
       dt.Rows.Add(dr);
     }
     DataView dv = new DataView(dt);
     return dv;
   }

   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>

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动态添加GridView模板列2007-07-25 11:43:00

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