Question

大家好请帮帮我

我的Shopping.cs文件在下面给出

using System;
using System.Data;
using MyWebsite.Commerce;
using System.Collections.Generic;
using System.Configuration;
using System.Linq;
using System.Web;
using System.Data.SqlClient;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Xml.Serialization;


namespace MyWebsite.Commerce
{
    [Serializable]
    public class CartItem
    {
        private int _productID;
        private string _productName;
        private string _productURL;
        private int _quantity;
        private double _price;
        private double _lineTotal;
        public void New()
        {
        }
        public void New(int ProductID, string ProductName, string ProductURL, int Quantity, double Price)
        {
            _productID = ProductID;
            _productName = ProductName;
            _productURL = ProductURL;
            _quantity = Quantity;
            _price = Price;
            _lineTotal = Quantity * Price;
        }
        public int ProductID { get; set; }
        public string ProductName { get; set; }
        public string ProductURL { get; set; }
        public int Quantity { get; set; }
        public double Price { get; set; }
        public double LineTotal { get; set; }


        [Serializable]

        public class ShoppingCart
        {
            private DateTime _dateCreated;
            private DateTime _lastUpdate;
            private List<CartItem> _items;
            public ShoppingCart()
            {
                if (this._items = null)
                {
                    this._items = new List<CartItem>();
                    this._dateCreated = DateTime.Now;
                }
            }
            public List<CartItem> Items
            { get; set; }
            public void Insert(int ProductID, string ProductName, string ProductURL, int Quantity, double Price)
            {
                int ItemIndex = ItemIndexOfID(ProductID);
                if (ItemIndex == -1)
                {
                    CartItem NewItem = new CartItem();
                    NewItem.ProductID = ProductID;
                    NewItem.ProductName = ProductName;
                    NewItem.ProductURL = ProductURL;
                    NewItem.Price = Price;
                    NewItem.Quantity = Quantity;
                    _items.Add(NewItem);
                }
                else
                {
                    _items[ItemIndex].Quantity += 1;
                }
                _lastUpdate = DateTime.Now;
            }

            public void Update(int RowID, int ProductID, int Quantity, double Price)
            {
                CartItem Item = _items[RowID];
                Item.ProductID = ProductID;
                Item.Quantity = Quantity;
                Item.Price = Price;
                _lastUpdate = DateTime.Now;
            }
            public void DeleteItem(int rowID)
            {
                _items.RemoveAt(rowID);
                _lastUpdate = DateTime.Now;
            }
            private int ItemIndexOfID(int ProductID)
            {
                int index = 0;
                foreach (CartItem item in _items)
                {
                    if (item.ProductID == ProductID)
                    {
                        return index;
                    }
                    index += 1;
                }
                return -1;
            }
            public double Total
            {
                get
                {
                    double t = 0;
                    if (_items == null)
                    {
                        return 0;
                    }
                    foreach (CartItem Item in _items)
                    {
                        t += Item.LineTotal;
                    }
                    return t;
                }
            }
        }

    }
}

and then i create a web user control file ShoppingCart.ascx and ShoppingCart.ascx.cs file code are given below of ShoppingCart.ascx.cs

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Web;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using MyWebsite.Commerce;


public partial class ShoppingCart : System.Web.UI.UserControl
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (Profile.Cart == null)
        {
            Profile.Cart = new MyWebsite.Commerce.ShoppingCart();
        }
        if (!Page.IsPostBack)
        {
            BindGrid();
        }
        if (Profile.Cart.Items == null)
        {
            TotalLabel.Visible = false;
        }
    }
    protected void CartGrid_RowEditing(object sender, GridViewEditEventArgs e)
    {
        CartGrid.EditIndex = e.NewEditIndex;
        BindGrid();
    }
    protected void CartGrid_RowUpdating(object sender, GridViewUpdatedEventArgs e)
    {
        TextBox QuantityTextBox = (TextBox)CartGrid.Rows[e.RowIndex].Cells[2].Controls[0];
        int Quantity = Convert.ToString(QuantityTextBox.Text);
        if (Quantity == 0)
        {
            Profile.Cart.Items.RemoveAt(e.RowIndaex);
        }
        else
        {
            Profile.Cart.Items[e.RowIndex].Quantity = Quantity;
        }
        CartGrid.EditIndex = -1;
        BindGrid();
    }
    protected void CartGrid_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
    {
        CartGrid.EditIndex = -1;
        BindGrid();
    }
    protected void CartGrid_RowDeleting(object sender, GridViewDeleteEventArgs e)
    {
        Profile.Cart.Items.RemoveAt(e.RowIndex);
        BindGrid();
    }

    private void BindGrid()
    {
        CartGrid.DataSource = Profile.Cart.Items;
        DataBind();
        TotalLabel.Text = string.Format("Total : {0,19:c}", Profile.Cart.Total);
    }
}

当我将ShoppingCart.ascx文件拖放到ShoppingCartPage.aspx文件并运行应用程序时发生错误，当我点击错误时我继续下面的代码

描述：编译服务此请求所需的资源时发生错误。请查看以下特定错误详细信息并适当修改源代码。

编译器错误消息：CS0234：   类型或命名空间名称'ShoppingCart'   在命名空间中不存在   'MyWebsite.Commerce'（你错过了吗？   汇编参考？）

第17行：公共类ProfileCommon：   System.Web.Profile.ProfileBase {Line   18：第19行：公共虚拟   MyWebsite.Commerce.ShoppingCart Cart {   第20行：获得{第21行：第   返回   （（MyWebsite.Commerce.ShoppingCart）（this.GetPropertyValue（ “购物车”）））;

请帮助我..................

Answer 1

不是说这是解决此问题的最佳或唯一方法，但我会尝试删除所有引用并逐个添加它们，直到您重新开始工作..

Answer 2

这对我来说很难掌握，所以我只想在这里提出一个想法供你测试。因为我看到你的班级

你有

namespace MyWebsite.Commerce

然后你有一个CartItem类。然后，不是拥有另一个完全独立的类ShoppingCart，而是在CartItem中拥有该类。

我可能是错的（因为我没有尝试过测试），但我认为你的ascx中有一行

Profile.Cart = new MyWebsite.Commerce.ShoppingCart();

应该是

Profile.Cart = new MyWebsite.Commerce.CartItem.ShoppingCart();

注意额外的CartItem。

或者将ShoppingCart类编写为MyWebsite.Commerce命名空间中的单独类。

缺少装配参考

2 个答案: