asp.net|動態|模板
動態添加列，關鍵是實現 ITemplate.InstantiateIn 方法。下面是一個添加 GridView 模板列的例子。
C#代碼
<%...@ 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] = "清單項目 " + 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("-----請選擇------",""));
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, "動態添加列");
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)
...{
//可以在這裡訪問資料庫的其它欄位的值，可以設定預設選擇項，具體應用，看自己的發揮了。
//下面只是例子，舉一反三，不再費話了
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動態添加模板列的例子</title>
</head>
<body>
<form id="form1" runat="server">
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"
OnRowDataBound="GridView1_RowDataBound">
<Columns>
<asp:BoundField HeaderText="標題" DataField="text"/>
</Columns>
</asp:GridView>
</form>
</body>
</html>
