我有以下用户控制（ CustomerControl.ascx ）：
<%@ Control Language="C#" AutoEventWireup="true" CodeFile="CustomerControl.ascx.cs" Inherits="CustomerControl" %>
<tr>
<td><%= this.FirstName %></td>
<td><%= this.LastName %></td>
<td><%= this.Email %></td>
<td><%= this.Service %></td>
<td><%= this.Amount %></td>
<td>
<button ID="DelCustomerBtn" OnServerClick="OnDelBtnClicked" runat="server">Delete</button>
</td>
</tr>
它是一个带有删除按钮的表格行，该按钮反映了Customers表格Id，FirstName，LastName，Email，{{ 1}}，Service）。 代码隐藏文件为（ Amount ）：
CustomerControl.ascx.cs 首页（ protected void Page_Load(object sender, EventArgs e)
{
// Add data-id = id_of_current_row_in_database
DelCustomerBtn.Attributes.Add("data-id", this.Id.ToString());
}
private int id;
private string firstName;
private string lastName;
private string email;
private string service;
private decimal amount;
public event EventHandler DelBtnClicked;
protected void OnDelBtnClicked(object sender, EventArgs e)
{
if (DelBtnClicked != null)
DelBtnClicked(this, e);
}
public int Id
{
get { return id; }
set { id = value; }
}
public string FirstName
{
get { return firstName; }
set { firstName = value; }
}
public string LastName
{
get { return lastName; }
set { lastName = value; }
}
public string Email
{
get { return email; }
set { email = value; }
}
public string Service
{
get { return service; }
set { service = value; }
}
public decimal Amount
{
get { return amount; }
set { amount = value; }
}
）中包含以下内容：
Default.aspx最后，其代码隐藏文件（ <table>
<thead>
<tr>
<th>First</th>
<th>Last</th>
<th>Email</th>
<th>Service</th>
<th>Amount</th>
<th></th>
</tr>
</thead>
<tbody>
<asp:PlaceHolder ID="RowPlaceholder" runat="server" />
</tbody>
</table>
）包含：
Default.aspx.cs将protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
// Retrieve records from the DB:
CustomersDataContext dataContext = new CustomersDataContext();
var users = from user in dataContext.Customers
select new
{
Id = user.Id,
FirstName = user.FirstName,
LastName = user.LastName,
Email = user.Email,
Service = user.Service,
Amount = user.Amount
};
// Declare CustomerControl object to hold controls:
CustomerControl CustomerControl;
// Add CustomerControl controls for each record in the DB:
foreach (var user in users)
{
// Load the CustomerControlcontrol:
CustomerControl = (CustomerControl)LoadControl("~/CustomerControl.ascx");
// Set the control's data:
CustomerControl.Id = user.Id;
CustomerControl.FirstName = user.FirstName;
CustomerControl.LastName = user.LastName;
CustomerControl.Email = user.Email;
CustomerControl.Service = user.Service;
CustomerControl.Amount = user.Amount;
CustomerControl.DelBtnClicked += HandleDelBtnClicked;
// Add the control to RowPlaceholder:
RowPlaceholder.Controls.Add(CustomerControl);
}
} // endif
}
public void HandleDelBtnClicked(object sender, EventArgs e)
{
Button btn = (Button)sender;
// Retrieve id_of_current_row_in_database, as set in user control
int id = int.Parse(btn.Attributes["data-id"].ToString());
CustomersDataContext dataContext = new CustomersDataContext();
var find = from cst in dataContext.Customers
where cst.Id == id
select cst;
dataContext.Customers.DeleteOnSubmit(find.First());
dataContext.SubmitChanges();
}
的{{1}}属性中的每条记录的ID存储在ID为data-id的{{1}}属性中。检索button的值以便按id查找记录（将Linq引用到SQL）并删除它。
这段代码虽然超级简单，但不起作用。当我单击“删除”按钮时，页面将刷新，我不再在DelCustomerBtn中看到任何行。没有数据从数据库中删除。