后端代码
请帮助确定问题
gridview中的数量字段中存在数据绑定错误，其中包含导致错误的下拉列表
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
public partial class Webpages_Cart : System.Web.UI.Page
{
SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["ProjectConn"].ConnectionString);
DataTable dtCart = new DataTable();
protected void Page_Load(object sender, EventArgs e)
{
string id;
if (Session["bool"] != null)
{
bool ab = (bool)Session["bool"];
id = (string)Request.QueryString["Id"];
if (ab == true)
{
con.Open();
SqlCommand cmd = con.CreateCommand();
cmd.CommandText = "Select Name,Money from Image where Id=" + id;
SqlDataAdapter da = new SqlDataAdapter(cmd);
if (Session["Cart"] == null)
{
da.Fill(dtCart);
Session["Cart"] = dtCart;
con.Close();
FillCart();
CreateCart();
}
else
{
DataTable data = Session["Cart"] as DataTable;
da.Fill(dtCart);
dtCart.Merge(data);
dtCart.AcceptChanges();
Session["Cart"] = dtCart;
con.Close();
FillCart();
}
}
else
{
if (Session["Cart"] != null)
{
dtCart = Session["Cart"] as DataTable;
FillCart();
}
}
if(Session["Cart"]==null)
{
FillCart();
CreateCart();
}
Session["bool"] = false;
}
}
protected void ddlQuantity_SelectedIndexChanged(object sender, EventArgs e)
{
try
{
DataTable dtCart = (DataTable)Session["Cart"];
DropDownList ddl = (DropDownList)sender;
GridViewRow row = (GridViewRow)ddl.NamingContainer;
if (row != null)
{
int quantity = Convert.ToInt32(((DropDownList)(row.FindControl("ddlQuantity"))).SelectedValue);
int index = Convert.ToInt32(((DropDownList)(row.FindControl("ddlQuantity"))).SelectedIndex);
int price = Convert.ToInt32(dtCart.Rows[row.RowIndex]["Price"]);
dtCart.Rows[row.RowIndex].SetField("Quantity", (quantity));
dtCart.Rows[row.RowIndex].SetField("Subtotal", (quantity * price));
GridView1.DataSource = dtCart;
GridView1.DataBind();
Session["Cart"] = dtCart;
}
}
catch (Exception ex)
{
Response.Redirect("ErrorPa.aspx?Id="+ex.Message.ToString());
}
}
private void CreateCart()
{
dtCart = new DataTable();
dtCart.Columns.Add("Sr No", typeof(int));
dtCart.Columns.Add("Name", typeof(string));
dtCart.Columns.Add("Price", typeof(int));
//dtCart.Columns.Add("Image");
dtCart.Columns.Add("Quantity", typeof(int));
dtCart.Columns.Add("Subtotal", typeof(int));
}
private void FillCart()
{
try
{
if (Session["Cart"] != null)
{
dtCart = (DataTable)Session["Cart"];
}
DataTable dtSelProducts = (DataTable)Session["dtSelectProduct"];
if (Session["dtSelectProduct"] != null)
{
foreach (DataRow dr in dtSelProducts.Rows)
{
dtCart.Rows.Add(Convert.ToInt32(dtCart.Rows.Count + 1), Convert.ToString(dr["Name"]), Convert.ToInt32(dr["Price"]), 1, Convert.ToInt32(dr["Price"]));
}
Session["dtSelectProduct"] = null;
}
Session["Cart"] = dtCart;
GridView1.DataSource = dtCart;
GridView1.DataBind();
}
catch (Exception ex)
{
Response.Redirect("ErrorPa.aspx?Id="+ex.Message.ToString());
}
}
protected void imgDeleteProduct_Click(object sender, ImageClickEventArgs e)
{
try
{
DataTable dtCart = (DataTable)Session["Cart"];
int SrNo = Convert.ToInt32(((ImageButton)sender).CommandArgument);
dtCart.Rows.RemoveAt((SrNo - 1));
dtCart = RegenerateDataTable(dtCart);
GridView1.DataSource = dtCart;
GridView1.DataBind();
Session["Cart"] = dtCart;
if (dtCart.Rows.Count == 0)
{
btnProceed.Enabled = false;//dvSendOrder.Visible = false;
}
Label lblMaster = (Label)this.Master.FindControl("lblCartValue");
//if (lblMaster != null)
//{
// if (Session["Cart"] == null)
// {
// lblMaster.Text = "(0)";
// }
// else
// {
// DataTable dt = (DataTable)Session["Cart"];
// lblMaster.Text = "(" + Convert.ToString(dt.Rows.Count) + ")";
// }
//}
}
catch (Exception ex)
{
Response.Redirect("ErrorPa.aspx?Id="+ex.Message.ToString());
}
}
private DataTable RegenerateDataTable(DataTable dt)
{
int srno = 0;
DataTable dtDup = dt.Clone();
try
{
foreach (DataRow row in dt.Rows)
{
DataRow drNew = dtDup.NewRow();
srno += 1;
drNew[0] = srno;
drNew[1] = row[1];
drNew[2] = row[2];
drNew[3] = row[3];
drNew[4] = row[4];
drNew[5] = row[5];
drNew[6] = row[6];
dtDup.Rows.Add(drNew);
}
}
catch (Exception ex)
{
Response.Redirect("ErrorPa.aspx?Id="+ex.Message.ToString());
}
return dtDup;
}
}
前端
GridView中的数量字段导致错误，因为数据未绑定
<%@ Page Title="Cart" Language="C#" ErrorPage="~/Webpages/ErrorPa.aspx" MasterPageFile="~/Site.master" AutoEventWireup="true" CodeFile="Cart.aspx.cs" Inherits="Webpages_Cart" %>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder2" Runat="Server">
</asp:Content>
<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
<br /><br />
<h1 class="Contact">Cart</h1>
<%-- <asp:GridView ID="GridView1" runat="server">
<Columns>
<asp:ImageField HeaderText="Image" DataImageUrlField="Image" ReadOnly="True">
</asp:ImageField>--%>
<asp:GridView ID="GridView1" HorizontalAlign="Center" ShowHeaderWhenEmpty="true" runat="server" RowStyle-HorizontalAlign="Center" HeaderStyle-HorizontalAlign="Center" EnableModelValidation="True"
AutoGenerateColumns="False" CssClass="mGrid" AlternatingRowStyle-CssClass="alt" PagerStyle-CssClass="pgr" EmptyDataText="There are no items in cart.">
<AlternatingRowStyle CssClass="alt" />
<Columns>
<asp:BoundField HeaderText="Sr No"/>
<%--<asp:BoundField HeaderText="ID" DataField="ProductID" />--%>
<asp:BoundField HeaderText="Name" DataField="Name" />
<asp:BoundField HeaderText="Price" DataField="Money" />
<%--<asp:ImageField HeaderText="Image" DataImageUrlField="Image" />--%>
<asp:TemplateField HeaderText="Quantity">
<ItemTemplate>
<asp:DropDownList ID="ddlQuantity" runat="server" OnSelectedIndexChanged="ddlQuantity_SelectedIndexChanged" AutoPostBack="True" SelectedValue='<%# Bind("Quantity")%>'>
<asp:ListItem Value="1" Text="1"></asp:ListItem>
<asp:ListItem Value="2" Text="2"></asp:ListItem>
<asp:ListItem Value="3" Text="3"></asp:ListItem>
<asp:ListItem Value="4" Text="4"></asp:ListItem>
<asp:ListItem Value="5" Text="5"></asp:ListItem>
<asp:ListItem Value="6" Text="6"></asp:ListItem>
<asp:ListItem Value="7" Text="7"></asp:ListItem>
<asp:ListItem Value="8" Text="8"></asp:ListItem>
<asp:ListItem Value="9" Text="9"></asp:ListItem>
<asp:ListItem Value="10" Text="10"></asp:ListItem>
</asp:DropDownList>
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField HeaderText="Subtotal" DataField="Subtotal" />
<asp:TemplateField HeaderText="Delete">
<ItemTemplate>
<asp:ImageButton ID="imgDeleteProduct" CommandArgument='<%# Eval("SrNo") %>' ToolTip="Remove"
OnClientClick="return confirm('Are you sure you want to remove this product?');" CausesValidation="False"
OnClick="imgDeleteProduct_Click" ImageUrl="images/delete_icon.png"
runat="server" />
</ItemTemplate>
</asp:TemplateField>
</Columns>
<HeaderStyle HorizontalAlign="Center" VerticalAlign="Middle" />
<PagerStyle CssClass="pgr" />
<RowStyle HorizontalAlign="Center" />
</asp:GridView>
<asp:Button ID="btnProceed" runat="server" Text="Button" />
</asp:Content>