购物车问题请各位帮忙，谢谢！

cyp503(谁怕？一蓑烟雨任平生)说得对
www.asp.net,IBuySpy的例子也不错

Web.config
<configuration>
  <appSettings>
    <add key="connectString"
      value="server=localhost;database=pubs;uid=sa;pwd=" />
  </appSettings>
</configuration>
Figure 9-14

Congo.com source code.
Global.asax
<script language="C#" runat="server">
  void Session_Start ()
  {
      Session["MyShoppingCart"] = new ShoppingCart ();
  }
</script>
Congo.aspx
<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Data.SqlClient" %><html>
  <body>
    <h1>Congo.com</h1>
    <form runat="server">
      <table width="100%" bgcolor="teal">
        <tr>
          <td>
            <asp:Button Text="View Cart" OnClick="OnViewCart"
              RunAt="server" />
          </td>
        </tr>
      </table>
      <br>
      <center>
        <asp:DataGrid ID="MyDataGrid"
          AutoGenerateColumns="false" CellPadding="2"
          BorderWidth="1" BorderColor="lightgray"
          Font-Name="Verdana" Font-Size="8pt"
          GridLines="vertical" Width="90%"
          OnItemCommand="OnItemCommand" RunAt="server">
          <Columns>
            <asp:BoundColumn HeaderText="Item ID"
              DataField="title_id" />
            <asp:BoundColumn HeaderText="Title"
              DataField="title" />
            <asp:BoundColumn HeaderText="Price"
              DataField="price" DataFormatString="{0:c}"
              HeaderStyle-HorizontalAlign="center"
              ItemStyle-HorizontalAlign="right" />
            <asp:ButtonColumn HeaderText="Action" Text="Add to Cart"
              HeaderStyle-HorizontalAlign="center"
              ItemStyle-HorizontalAlign="center"
              CommandName="AddToCart" />
          </Columns>
          <HeaderStyle BackColor="teal" ForeColor="white"
            Font-Bold="true" />
          <ItemStyle BackColor="white" ForeColor="darkblue" />
          <AlternatingItemStyle BackColor="beige"
            ForeColor="darkblue" />
        </asp:DataGrid>
    </center>
    </form>
  </body>
</html><script language="C#" runat="server">
  void Page_Load (Object sender, EventArgs e)
  {
      if (!IsPostBack) {
          string ConnectString =
              ConfigurationSettings.AppSettings["connectString"];
          SqlDataAdapter adapter = new SqlDataAdapter
              ("select * from titles where price != 0", ConnectString);
          DataSet ds = new DataSet ();
          adapter.Fill (ds);
          MyDataGrid.DataSource = ds;
          MyDataGrid.DataBind ();
      }
  }  void OnItemCommand (Object sender, DataGridCommandEventArgs e)
  {
      if (e.CommandName == "AddToCart") {
          BookOrder order = new BookOrder (e.Item.Cells[0].Text,
              e.Item.Cells[1].Text, Convert.ToDecimal
              (e.Item.Cells[2].Text.Substring (1)), 1);
          ShoppingCart cart = (ShoppingCart) Session["MyShoppingCart"];
          if (cart != null)
              cart.AddOrder (order);
      }
  }  void OnViewCart (Object sender, EventArgs e)
  {
      Response.Redirect ("ViewCart.aspx");
  }
</script>

ViewCart.aspx
<html>
  <body>
    <h1>Shopping Cart</h1>
    <form runat="server">
      <table width="100%" bgcolor="teal">
        <tr>
          <td>
            <asp:Button Text="Return to Shopping" OnClick="OnShop"
              RunAt="server" />
          </td>
        </tr>
      </table>
      <br>
      <center>
        <asp:DataGrid ID="MyDataGrid"
          AutoGenerateColumns="false" CellPadding="2"
          BorderWidth="1" BorderColor="lightgray"
          Font-Name="Verdana" Font-Size="8pt"
          GridLines="vertical" Width="90%"
          OnItemCommand="OnItemCommand" RunAt="server">
          <Columns>
            <asp:BoundColumn HeaderText="Item ID"
              DataField="ItemID" />
            <asp:BoundColumn HeaderText="Title"
              DataField="Title" />
            <asp:BoundColumn HeaderText="Price"
              DataField="Price" DataFormatString="{0:c}"
              HeaderStyle-HorizontalAlign="center"
              ItemStyle-HorizontalAlign="right" />
            <asp:BoundColumn HeaderText="Quantity"
              DataField="Quantity"
              HeaderStyle-HorizontalAlign="center"
              ItemStyle-HorizontalAlign="center" />
            <asp:ButtonColumn HeaderText="Action" Text="Remove"
              HeaderStyle-HorizontalAlign="center"
              ItemStyle-HorizontalAlign="center"
              CommandName="RemoveFromCart" />
          </Columns>
          <HeaderStyle BackColor="teal" ForeColor="white"
            Font-Bold="true" />
          <ItemStyle BackColor="white" ForeColor="darkblue" />
          <AlternatingItemStyle BackColor="beige"
            ForeColor="darkblue" />
        </asp:DataGrid>
      </center>
      <h3><asp:Label ID= "Total" RunAt="server" /></h3>
    </form>
  </body>
</html><script language="C#" runat="server">
  void Page_Load (Object sender, EventArgs e)
  {
      ShoppingCart cart = (ShoppingCart) Session["MyShoppingCart"];
      if (cart != null) {
          MyDataGrid.DataSource = cart.Orders;
          MyDataGrid.DataBind ();
          Total.Text = String.Format ("Total Cost: {0:c}",
              cart.TotalCost);
      }
  }  void OnItemCommand (Object sender, DataGridCommandEventArgs e)
  {
      if (e.CommandName == "RemoveFromCart") {
          ShoppingCart cart = (ShoppingCart) Session["MyShoppingCart"];
          if (cart != null) {
              cart.RemoveOrder (e.Item.Cells[0].Text);
              MyDataGrid.DataBind ();
              Total.Text = String.Format ("Total Cost: {0:c}",
                  cart.TotalCost);
          }
      }
  }  public void OnShop (Object sender, EventArgs e)
  {
      Response.Redirect ("Congo.aspx");
  }
</script>
Congo.cs
using System;
using System.Collections;[Serializable]
public class BookOrder
{
    string _ItemID;
    string _Title;
    decimal _Price;
    int _Quantity;    public string ItemID
    {
        get { return _ItemID; }
        set { _ItemID = value; }
    }    public string Title
    {
        get { return _Title; }
        set { _Title = value; }
    }    public decimal Price
    {
        get { return _Price; }
        set { _Price = value; }
    }    public int Quantity
    {
        get { return _Quantity; }
        set { _Quantity = value; }
    }    public BookOrder (string ItemID, string Title, decimal Price,
        int Quantity)
    {
        _ItemID = ItemID;
        _Title = Title;
        _Price = Price;
        _Quantity = Quantity;
    }
}[Serializable]
public class ShoppingCart
{
    Hashtable _Orders = new Hashtable ();    public ICollection Orders
    {
        get { return _Orders.Values; }
    }

    public decimal TotalCost
    {
        get
        {
            decimal total = 0;
            foreach (DictionaryEntry entry in _Orders) {
                BookOrder order = (BookOrder) entry.Value;
                total += (order.Price * order.Quantity);
            }
            return total;
        }
    }    public void AddOrder (BookOrder Order)
    {
        BookOrder order = (BookOrder) _Orders[Order.ItemID];
        if (order != null)
            order.Quantity += Order.Quantity;
        else
            _Orders.Add (Order.ItemID, Order);
    }    public void RemoveOrder (string ItemID)
    {
        if (_Orders[ItemID] != null)
            _Orders.Remove (ItemID);
    }
}

调试易

购物车问题请各位帮忙，谢谢！

解决方案 »

购物车问题 请各位帮忙，谢谢！

解决方案 »

购物车问题请各位帮忙，谢谢！