ASP.NET 2.0 中动态添加 GridView 模板列的例子

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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。

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">

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>

<title>GridView动态添加模板列的例子</title>

</head>

<body>

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"

OnRowDataBound="GridView1_RowDataBound">

<asp:BoundField HeaderText="标题" DataField="text"/>

</Columns>

</asp:GridView>

</form>

</body>

</html>