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
<%[email protected] page language="c#" %>
<%[email protected] 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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