// e.Item is the table row where the command is raised. // For bound columns, the value is stored in the Text property of the TableCell. TableCell itemCell = e.Item.Cells[2]; TableCell priceCell = e.Item.Cells[3]; string item = itemCell.Text; string price = priceCell.Text;
if (((Button)e.CommandSource).CommandName == "AddToCart") { dr[0] = item; dr[1] = price; Cart.Rows.Add(dr); } else { //Remove from Cart.
[Visual Basic, C#] 下面的示例展示如何使用 AddAt 方法动态向 DataGrid 控件添加列。注意，DataGrid 控件的 Columns 属性是 DataGridColumnCollection 的一个实例。[C#]
<%@ Page Language="C#" AutoEventWireup="True" %>
<%@ Import Namespace="System.Data" %>
<html>
<script language="C#" runat="server">
DataTable Cart;
DataView CartView;
ICollection CreateDataSource()
{
DataTable dt = new DataTable();
DataRow dr;
dt.Columns.Add(new DataColumn("IntegerValue", typeof(Int32)));
dt.Columns.Add(new DataColumn("StringValue", typeof(string)));
dt.Columns.Add(new DataColumn("CurrencyValue", typeof(double)));
for (int i = 0; i < 9; i++)
{
dr = dt.NewRow();
dr[0] = i;
dr[1] = "Item " + i.ToString();
dr[2] = 1.23 * (i + 1);
dt.Rows.Add(dr);
}
DataView dv = new DataView(dt);
return dv;
}
void Page_Load(Object sender, EventArgs e)
{ if (Session["DG4_ShoppingCart"] == null)
{
Cart = new DataTable();
Cart.Columns.Add(new DataColumn("Item", typeof(string)));
Cart.Columns.Add(new DataColumn("Price", typeof(string)));
Session["DG4_ShoppingCart"] = Cart;
}
else
{
Cart = (DataTable)Session["DG4_ShoppingCart"];
}
CartView = new DataView(Cart);
ShoppingCart.DataSource = CartView;
ShoppingCart.DataBind();
if (!IsPostBack)
{
// Load this data only once.
ItemsGrid.DataSource= CreateDataSource();
ItemsGrid.DataBind();
} } void Page_Init(Object sender, EventArgs e)
{ // Create a dynamic column to add to Columns collection.
BoundColumn NumberColumn = new BoundColumn();
NumberColumn.HeaderText="Item Number";
NumberColumn.DataField="IntegerValue"; // Add column to Columns collection.
ItemsGrid.Columns.AddAt(2, NumberColumn); }
void Grid_CartCommand(Object sender, DataGridCommandEventArgs e) {
DataRow dr = Cart.NewRow();
// e.Item is the table row where the command is raised.
// For bound columns, the value is stored in the Text property of the TableCell.
TableCell itemCell = e.Item.Cells[2];
TableCell priceCell = e.Item.Cells[3];
string item = itemCell.Text;
string price = priceCell.Text;
if (((Button)e.CommandSource).CommandName == "AddToCart")
{
dr[0] = item;
dr[1] = price;
Cart.Rows.Add(dr);
}
else
{ //Remove from Cart.
CartView.RowFilter = "Item='" + item + "'";
if (CartView.Count > 0)
{
CartView.Delete(0);
}
CartView.RowFilter = "";
}
ShoppingCart.DataBind();
}
</script>
<body>
<form runat=server>
<h3>DataGridColumnCollection AddAt Example</h3>
<table cellpadding="5">
<tr valign="top">
<td>
<b>Product List</b>
<asp:DataGrid id="ItemsGrid"
BorderColor="black"
BorderWidth="1"
CellPadding="3"
AutoGenerateColumns="false"
OnItemCommand="Grid_CartCommand"
runat="server"> <HeaderStyle BackColor="#00aaaa">
</HeaderStyle>
<Columns>
<asp:ButtonColumn
HeaderText="Add to cart"
ButtonType="PushButton"
Text="Add"
CommandName="AddToCart"/>
<asp:ButtonColumn
HeaderText="Remove from cart"
ButtonType="PushButton"
Text="Remove"
CommandName="RemoveFromCart"/>
<asp:BoundColumn
HeaderText="Item"
DataField="StringValue"/>
<asp:BoundColumn
HeaderText="Price"
DataField="CurrencyValue"
DataFormatString="{0:c}"> <ItemStyle HorizontalAlign="right">
</ItemStyle> </asp:BoundColumn>
</Columns>
</asp:DataGrid>
</td>
<td>
<b>Shopping Cart</b>
<asp:DataGrid id="ShoppingCart"
runat="server"
BorderColor="black"
BorderWidth="1"
GridLines="Both"
ShowFooter="false"
CellPadding="3"
CellSpacing="0"> <HeaderStyle BackColor="#00aaaa">
</HeaderStyle> </asp:DataGrid>
</td>
</tr>
</table>
</form>
</body>
</html>
DataKeyField="ID">
<Columns>
<asp:TemplateColumn HeaderText="选择">
<ItemTemplate>
<asp:CheckBox ID="CbxSel" Runat="server"></asp:CheckBox>
</ItemTemplate>
</asp:TemplateColumn>
<asp:BoundColumn Visible="False" DataField="id"></asp:BoundColumn>
<asp:TemplateColumn HeaderText="标题">
<ItemTemplate>
<table>
<tr runat="server" id="trid">
<td>
<asp:HyperLink ID ="HlkEdit" Runat ="server" NavigateUrl='<% # MakeUrl(DataBinder.Eval(Container.DataItem,"id"))%>' Text ='<% # DataBinder.Eval(Container.DataItem,"subject")%>'>
</asp:HyperLink></td>
</tr>
</table>
</ItemTemplate>
</asp:TemplateColumn>
<asp:TemplateColumn HeaderText="删除">
<ItemTemplate>
<asp:LinkButton ID="lbtnDel" Runat="server" text="删除" CommandName="Delete"></asp:LinkButton>
</ItemTemplate>
</asp:TemplateColumn>
</Columns>
<PagerStyle Mode="NumericPages"></PagerStyle>
</asp:datagrid>