上一例中BoundColumn 控件不是唯一可以在 DataGrid 的 Columns 集合中设置的控
件。还可以指定 TemplateColumn，它使您可以完全控制列的内容。模板的内容可以是任
意的；在 DataGrid 的列中可以呈现任何内容，包括服务器控件。下面的示例说明如何
使用 TemplateColumn 控件将“State”列呈现为下拉列表并将“Contract”列呈现为复
选框 HtmlControl。ASP.NET 数据绑定语法用于输出模板中的数据字段值。注意，有一
些棘手的逻辑使下拉列表和复选框反射行中的数据状态。
<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Data.SqlClient" %>
<html>
<script language="C#" runat="server">
SqlConnection myConnection;
public Hashtable StateIndex;
protected void Page_Load(Object Src, EventArgs E)
{
myConnection = new SqlConnection("user id=sa;password=;initial
catalog=pubs;data source=jeff");
if (!IsPostBack)
BindGrid();
StateIndex = new Hashtable();
StateIndex["CA"] = 0;
StateIndex["IN"] = 1;
StateIndex["KS"] = 2;
StateIndex["MD"] = 3;
StateIndex["MI"] = 4;
StateIndex["OR"] = 5;
StateIndex["TN"] = 6;
StateIndex["UT"] = 7;
}
public int GetStateIndex(String stateName)
{
if (StateIndex[stateName] != null)
return (int)StateIndex[stateName];
else
return 0;
}
public void MyDataGrid_Edit(Object sender, DataGridCommandEventArgs E)
{
MyDataGrid.EditItemIndex = (int)E.Item.ItemIndex;
BindGrid();
}
public void MyDataGrid_Cancel(Object sender, DataGridCommandEventArgs E)
{
MyDataGrid.EditItemIndex = -1;
BindGrid();
}
public void MyDataGrid_Update(Object sender, DataGridCommandEventArgs E)
{
String updateCmd = "UPDATE Authors SET au_id = @Id, au_lname =
@LName, au_fname = @FName, phone = @Phone, "
+ "address = @Address, city = @City, state = @State, zip =
@Zip, contract = @Contract where au_id = @Id";
SqlCommand myCommand = new SqlCommand(updateCmd, myConnection);
myCommand.Parameters.Add(new SqlParameter("@Id",
SqlDbType.NVarChar, 11));
myCommand.Parameters.Add(new SqlParameter("@LName",
SqlDbType.NVarChar, 40));
myCommand.Parameters.Add(new SqlParameter("@FName",
SqlDbType.NVarChar, 20));
myCommand.Parameters.Add(new SqlParameter("@Phone",
SqlDbType.NChar, 12));
myCommand.Parameters.Add(new SqlParameter("@Address",
SqlDbType.NVarChar, 40));
myCommand.Parameters.Add(new SqlParameter("@City",
SqlDbType.NVarChar, 20));
myCommand.Parameters.Add(new SqlParameter("@State",
SqlDbType.NChar, 2));
myCommand.Parameters.Add(new SqlParameter("@Zip", SqlDbType.NChar,
5));
myCommand.Parameters.Add(new SqlParameter("@Contract",
SqlDbType.NVarChar,1));
myCommand.Parameters["@Id"].Value =
MyDataGrid.DataKeys[(int)E.Item.ItemIndex];
String[] cols = {"LName","FName","Phone","Address","City","Zip"};
for (int i=0; i<6; i++)
{
String colvalue = ((TextBox)E.Item.FindControl("edit_" +
cols[i])).Text;
// 检查在所需字段中是否有空值
if (i<3 && colvalue == "")
{
Message.InnerHtml = "错误：“姓名”或“电话”不允许使用空值";
Message.Style["color"] = "red";
return;
}
myCommand.Parameters["@" + cols[i]].Value = colvalue;
}
myCommand.Parameters["@State"].Value =
((DropDownList)E.Item.FindControl("edit_State")).SelectedItem.ToString();
if (((CheckBox)E.Item.FindControl("edit_Contract")).Checked == true)
myCommand.Parameters["@Contract"].Value = "1";
else
myCommand.Parameters["@Contract"].Value = "0";
myCommand.Connection.Open();
try
{
myCommand.ExecuteNonQuery();
Message.InnerHtml = "<b>已更新记录</b><br>" + updateCmd;
MyDataGrid.EditItemIndex = -1;
}
catch (SqlException e)
{
if (e.Number == 2627)
Message.InnerHtml = "错误：已存在具有相同主键的记录";
else
Message.InnerHtml = "错误：未能更新记录，请确保正确填写了字段
";
Message.Style["color"] = "red";
}
myCommand.Connection.Close();
BindGrid();
}
public void BindGrid()
{
SqlDataAdapter myCommand = new SqlDataAdapter("select * from
Authors", myConnection);
DataSet ds = new DataSet();
myCommand.Fill(ds, "Authors");
MyDataGrid.DataSource=ds.Tables["Authors"].DefaultView;
MyDataGrid.DataBind();
}
</script>
<body style="font: 10.5pt 宋体">
<form runat="server">
<h3><font face="宋体">更新具有模板列的数据行</font></h3>
<span id="Message" EnableViewState="false" style="font: arial 11pt;"
runat="server"/><p>
<ASP:DataGrid id="MyDataGrid" runat="server"
Width="800"
BackColor="#ccccff"
BorderColor="black"
ShowFooter="false"
CellPadding=3
CellSpacing="0"
Font-Name="Verdana"
Font-Size="8pt"
HeaderStyle-BackColor="#aaaadd"
OnEditCommand="MyDataGrid_Edit"
OnCancelCommand="MyDataGrid_Cancel"
OnUpdateCommand="MyDataGrid_Update"
DataKeyField="au_id"
AutoGenerateColumns="false"
>
<Columns>
<asp:EditCommandColumn EditText="编辑" CancelText="取消"
UpdateText="更新" ItemStyle-Wrap="false"/>
<asp:BoundColumn HeaderText="au_id" SortExpression="au_id"
ReadOnly="True" DataField="au_id" ItemStyle-Wrap="false"/>
<asp:TemplateColumn HeaderText="au_lname" SortExpression="au_lname">
<ItemTemplate>
<asp:Label runat="server" Text="<%#
DataBinder.Eval(Container.DataItem, "au_lname") %>"/>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox runat="server" id="edit_LName" Text="<%#
DataBinder.Eval(Container.DataItem, "au_lname") %>"/>
</EditItemTemplate>
</asp:TemplateColumn>
<asp:TemplateColumn HeaderText="au_fname" SortExpression="au_fname">
<ItemTemplate>
<asp:Label runat="server" Text="<%#
DataBinder.Eval(Container.DataItem, "au_fname") %>"/>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox runat="server" id="edit_FName" Text="<%#
DataBinder.Eval(Container.DataItem, "au_fname") %>"/>
</EditItemTemplate>
</asp:TemplateColumn>
<asp:TemplateColumn HeaderText="phone" SortExpression="phone">
<ItemTemplate>
<asp:Label runat="server" Text="<%#
DataBinder.Eval(Container.DataItem, "phone") %>"/>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox runat="server" id="edit_Phone" Text="<%#
DataBinder.Eval(Container.DataItem, "phone") %>"/>
</EditItemTemplate>
</asp:TemplateColumn>
<asp:TemplateColumn HeaderText="address" SortExpression="address">
<ItemTemplate>
<asp:Label runat="server" Text="<%#
DataBinder.Eval(Container.DataItem, "address") %>"/>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox runat="server" id="edit_Address" Text="<%#
DataBinder.Eval(Container.DataItem, "address") %>"/>
</EditItemTemplate>
</asp:TemplateColumn>
<asp:TemplateColumn HeaderText="city" SortExpression="city">
<ItemTemplate>
<asp:Label runat="server" Text="<%#
DataBinder.Eval(Container.DataItem, "city") %>"/>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox runat="server" id="edit_City" Text="<%#
DataBinder.Eval(Container.DataItem, "city") %>"/>
</EditItemTemplate>
</asp:TemplateColumn>
<asp:TemplateColumn HeaderText="state" SortExpression="state">
<ItemTemplate>
<asp:Label runat="server" Text="<%#
DataBinder.Eval(Container.DataItem, "state") %>"/>
</ItemTemplate>
<EditItemTemplate>
<asp:DropDownList runat="server" SelectedIndex="<%#
GetStateIndex(DataBinder.Eval(Container.DataItem, "state").ToString()) %>"
id="edit_State">
<asp:ListItem>CA</asp:ListItem>
<asp:ListItem>IN</asp:ListItem>
<asp:ListItem>KS</asp:ListItem>
<asp:ListItem>MD</asp:ListItem>
<asp:ListItem>MI</asp:ListItem>
<asp:ListItem>OR</asp:ListItem>
<asp:ListItem>TN</asp:ListItem>
<asp:ListItem>UT</asp:ListItem>
</asp:DropDownList>
</EditItemTemplate>
</asp:TemplateColumn>
<asp:TemplateColumn HeaderText="zip" SortExpression="zip">
<ItemTemplate>
<asp:Label runat="server" Text="<%#
DataBinder.Eval(Container.DataItem, "zip") %>"/>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox runat="server" id="edit_Zip" Text="<%#
DataBinder.Eval(Container.DataItem, "zip") %>"/>
</EditItemTemplate>
</asp:TemplateColumn>
<asp:TemplateColumn HeaderText="contract" SortExpression="contract">
<ItemTemplate>
<asp:Label runat="server" Text="<%#
DataBinder.Eval(Container.DataItem, "contract", "{0}") %>"/>
</ItemTemplate>
<EditItemTemplate>
<asp:CheckBox runat="server" id="edit_Contract" Checked="<%#
DataBinder.Eval(Container.DataItem, "contract") %>"/>
</EditItemTemplate>
</asp:TemplateColumn>
</Columns>
</ASP:DataGrid>
</form>
</body>
</html>
