ASP.NET 2.0中动态添加GridView的列_asp添加grid的列-优快云博客

本文介绍如何使用ASP.NET中的GridView控件动态添加模板列。通过创建自定义模板并利用ITemplate接口，可以在运行时根据需求灵活地添加不同类型的列。

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动态添加列，关键是实现 ITemplate.InstantiateIn 方法。下面是一个添加 GridView 模板列的例子。

  <%@ 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>