我正在使用列出了多个项目的ListView，每个项目都有自己的购买按钮。现在，用户可以选择他们想要的物品（汽车）上的购买按钮，并将它们带到BuyCars.aspx页面，但没有任何东西显示所选项目（汽车）。当用户点击购买某辆车到BuyCars.aspx总页面时，我无法弄清楚如何发送数据。
我为代码量道歉，但这个问题让我感到疯狂。
这是我的代码。谢谢！
<%@ Page Title="" Language="C#" MasterPageFile="~/MasterBlaster024.Master" AutoEventWireup="True" CodeBehind="Cars.aspx.cs" Inherits="CarSales_REAL.WebForm2" %>
<asp:Content ID="Content1" ContentPlaceHolderID="Main" runat="server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="div2" runat="server">
<div class="row">
<asp:ListView ID="ListView1" runat="server" class="custom-class" DataSourceID="SqlDataSource1" OnItemCommand="ListView1_ItemCommand" DataKeyNames="CarID" OnSelectedIndexChanged="ListView1_SelectedIndexChanged">
<ItemTemplate>
<div class="col-sm-4">
<div class="custom_class">
<a href='/Shop/Order/<%# Eval("CarID") %>'>
<img src='/Images/<%# Eval("ImageCar") %>'
alt='<%# Eval("Name") %>' /></a>
<div class="caption">
<h3>
<%# Eval("Name") %>
</h3>
<p><b>Price: <%# Eval("CarPrice", "{0:c}") %></b>
<br><br>
<%# Eval("Long_Description") %>
</p>
</div>
<%--<div class="row">
<div class ="form-group">
<label class="col-sm-1">Quantity:</label>
</div>
</div>--%>
<div class="col-sm-8">
<%--<asp:RequiredFieldValidator ID="RequiredFieldValidator1" CssClass="text-danger"
runat="server" ControlToValidate="txtQuantity1" Display="Dynamic"
ErrorMessage="Quantity is a required field." ValidationGroup='<%# ListView1.ClientID + "_" + Container.DataItemIndex %>'></asp:RequiredFieldValidator>
<asp:RangeValidator ID="RangeValidator1" runat="server" CssClass="text-danger" ControlToValidate="txtQuantity1" Display="Dynamic" ErrorMessage="Quantity must range from 1 to 2." MaximumValue="2" MinimumValue="1" Type="Integer"></asp:RangeValidator>--%>
</div>
<div class="form-group">
<div class="col-sm-12">
<div class="col-sm-12">
<asp:Button ID="btnBuy" runat="server" Text="Buy Car" onclick="btnAdd_Click" CssClass="btn" ValidationGroup='<%# ListView1.ClientID + "_" + Container.DataItemIndex %>' />
<asp:Button ID="btnCart" runat="server" Text="See Selected Car" PostBackUrl="~/BuyCars.aspx" CausesValidation="False" CssClass="btn" />
</div>
</div>
</div>
<div>
<asp:Label ID="lblMessage" runat="server" EnableViewState="false" CssClass="text-info col-sm-12"></asp:Label>
</div>
</div>
</div>
</ItemTemplate>
</asp:ListView>
<%--<div class="col-sm-3">
<asp:TextBox ID="txtQuantity1" runat="server"
CssClass="form-control"></asp:TextBox>
</div>--%>
</div>
<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:ConnectionString %>" SelectCommand="SELECT [CarID], [Name], [Long_Description], [CarPrice], [ImageCar] FROM [Table] ORDER BY [Name]" OnSelecting="SqlDataSource1_Selecting"></asp:SqlDataSource>
</asp:Content>
namespace CarSales_REAL
{
public partial class WebForm2 : System.Web.UI.Page
{
private Product selectedProduct;
protected void Page_Load(object sender, EventArgs e)
{
UnobtrusiveValidationMode = UnobtrusiveValidationMode.None;
if (!IsPostBack) ListView1.DataBind();
selectedProduct = this.GetSelectedProduct();
}
private Product GetSelectedProduct()
{
DataView productsTable = (DataView)
SqlDataSource1.Select(DataSourceSelectArguments.Empty);
//productsTable.RowFilter = "CarID = '" + ListView1.SelectedValue + "'";
DataRowView row = productsTable[1];
Product p = new Product();
p.CardID = row["CarID"].ToString();
p.Name = row["Name"].ToString();
//p.Short_Description = row["Short_Description"].ToString();
p.Long_description = row["long_Description"].ToString();
p.CarPrice = (decimal)row["CarPrice"];
//p.ImageFile = row["ImageFile"].ToString();
return p;
}
protected void SqlDataSource1_Selecting(object sender, SqlDataSourceSelectingEventArgs e)
{
}
protected void btnAdd_Click(object sender, EventArgs e)
{
Button btnBuy = (Button)sender;
if (Page.IsValid)
{
CartItemList cart = CartItemList.GetCart();
CartItem cartItem = cart[selectedProduct.CardID];
if (cartItem == null)
{
//cart.AddItem(selectedProduct,
// Convert.ToInt32(txtQuantity1.Text));
}
else
{
//cartItem.AddQuantity(Convert.ToInt32(txtQuantity1.Text));
}
Response.Redirect("BuyCars.aspx");
}
}
protected void btnCart_Click(object sender, EventArgs e)
{
}
protected void ListView1_SelectedIndexChanged(object sender, EventArgs e)
{
}
protected void ListView1_ItemCommand(object sender, ListViewCommandEventArgs e)
{
}
}
}
<%@ Page Title="" Language="C#" MasterPageFile="~/MasterBlaster024.Master" AutoEventWireup="True" CodeBehind="BuyCars.aspx.cs" Inherits="CarSales_REAL.WebForm3" %>
<%@ MasterType VirtualPath="~/MasterBlaster024.Master" %>
<asp:Content ID="Content1" ContentPlaceHolderID="Main" runat="server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="div2" runat="server">
<div class="row">
<div class="col-sm-6">
<div class="form-group">
<div class="col-sm-12"><asp:ListBox ID="Cart1" runat="server" CssClass="form-control"></asp:ListBox></div>
</div>
</div>
<div class="form-group">
<div class="col-sm-12"><asp:Button ID="btnRemove" runat="server"
Text="Remove Item" OnClick="btnRemove_Click" CssClass="btn"/></div>
<div class="form-group">
<div class="col-sm-12"><asp:Button ID="btnEmpty" runat="server"
Text="Empty Cart" OnClick="btnEmpty_Click" CssClass="btn" />
</div>
</div>
</div>
<div class="row">
<div class="col-sm-12">
<div class="form-group">
<asp:Label ID="lblMessage" runat="server" EnableViewState="false"
CssClass="text-info col-sm-12"></asp:Label>
</div>
<div class="form-group">
<div class="col-sm-12">
<asp:Button ID="btnContinue" runat="server"
PostBackUrl="~/Cars.aspx" Text="Continue Shopping" CssClass="btn" />
<asp:Button ID="btnCheckOut" runat="server" Text="Check Out"
onclick="btnCheckOut_Click" CssClass="btn" />
</div>
</div>
</div>
</div>
</div>
</asp:Content>
namespace CarSales_REAL
{
public partial class WebForm3 : System.Web.UI.Page
{
private CartItemList cart;
protected void Page_Load(object sender, EventArgs e)
{
cart = CartItemList.GetCart();
if (!IsPostBack)
this.DisplayCart();
}
private void DisplayCart()
{
Cart1.Items.Clear();
CartItem item;
for (int i = 0; i < cart.Count; i++)
{
item = cart[i];
Cart1.Items.Add(item.Display());
}
}
protected void btnRemove_Click(object sender, EventArgs e)
{
if (cart.Count > 0)
{
if (Cart1.SelectedIndex > -1)
{
cart.RemoveAt(Cart1.SelectedIndex);
this.DisplayCart();
}
else
{
lblMessage.Text = "Please select the item you want to remove.";
}
}
}
protected void btnEmpty_Click(object sender, EventArgs e)
{
if (cart.Count > 0)
{
cart.Clear();
Cart1.Items.Clear();
}
}
protected void btnCheckOut_Click(object sender, EventArgs e)
{
lblMessage.Text = "Sorry, that function hasn't been implemented yet.";
}
}
}