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。
c#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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