Question

在我的gridview中，我列出了一系列来自数据库的产品，这些产品由存储过程加载。所以在网格视图中我列出了产品名称，价格，描述等，但后来我有一个名为quantity的文本字段，用户可以在其中输入数量，当他们按下更新时我将其作为购物车插入我的购物车中

Protected Sub btnUpdateCart_Click(ByVal sender As Object, ByVal e As EventArgs) Handles btnUpdateCart.Click
    For Each row As GridViewRow In gvShoppingCart.Rows
        If row.RowType = DataControlRowType.DataRow Then
            ' We'll use a try catch block in case something other than a number is typed in. If so, we'll just ignore it.
            Try
                ' Get the productId from the GridView's datakeys
                Dim productId = Convert.ToInt32(gvShoppingCart.DataKeys(row.RowIndex).Value)
                ' Find the quantity TextBox and retrieve the value
                Dim quantity = Integer.Parse(CType(row.Cells(1).FindControl("txtQuantity"), TextBox).Text)
                ShoppingCart.Instance.SetItemQuantity(productId, quantity)
            Catch ex As FormatException
            End Try
        End If
    Next

    BindData()
End Sub

就这样，但是当我在页面之间轻弹，即shoppingcart.aspx和checkout.aspx时，我放松了在这些复选框中输入的值，所以我要做的是每次我加载带有gridview的页面都要检查对于我的会话购物车，看看行和会话之间的产品ID是否匹配，如果他们这样做，那么在文本框中动态输入该数量。继承我的gridview

<asp:GridView runat="server" ID="gvShoppingCart" AutoGenerateColumns="false" EmptyDataText="There is nothing in your shopping cart." AlternatingRowStyle-CssClass="tr_dark"  HeaderStyle-CssClass="header_req" BorderWidth="0px" GridLines="None" AllowPaging="true" PageSize="25" AllowSorting="false" Width="100%" ShowFooter="true" DataKeyNames="ProductId" OnRowDataBound="gvShoppingCart_RowDataBound" OnRowCommand="gvShoppingCart_RowCommand">

    <Columns>                         
            <asp:TemplateField HeaderText="Product Name" HeaderStyle-Width="130px" SortExpression="productName">
                <ItemTemplate>   
                <asp:Label ID="ProductNameField" runat="server" Text='<%# Eval("description").ToString() %>'></asp:Label>
                </ItemTemplate>                     
            </asp:TemplateField> 

    </Columns>
    <Columns>                         
            <asp:TemplateField HeaderText="Pack Size" HeaderStyle-Width="70px" SortExpression="packSize">
                <ItemTemplate>  
                <asp:Label ID="PackSizeField" runat="server" Text='<%#  Eval("packSize").ToString()%>'></asp:Label>
                </ItemTemplate>                     
            </asp:TemplateField> 

    </Columns>
    <Columns>                         
            <asp:TemplateField HeaderText="Stock" HeaderStyle-Width="130px" SortExpression="address">
                <ItemTemplate>   
                <asp:Label ID="TradePriceField" runat="server" Text='<%#   DisplayStockLevel(Eval("StockIndicator").ToString()) %>'></asp:Label>
                </ItemTemplate>                     
            </asp:TemplateField> 

    </Columns>
    <Columns>
    <asp:TemplateField HeaderText="Quantity" HeaderStyle-Width="10px">
        <ItemTemplate>
            <asp:TextBox runat="server"  Width="30" ID="txtQuantity" Text='<%# Eval("Quantity") %>'></asp:TextBox>
        </ItemTemplate>
    </asp:TemplateField>
    </Columns>

    <Columns>
    <asp:BoundField DataField="UnitPrice" HeaderText="Actual Price" ItemStyle-HorizontalAlign="Right" HeaderStyle-HorizontalAlign="Right" DataFormatString="{0:C}" />
    <asp:BoundField DataField="TotalPrice" HeaderText="Total" ItemStyle-HorizontalAlign="Right" HeaderStyle-HorizontalAlign="Right" DataFormatString="{0:C}" />
    </Columns>
    <Columns>
    <asp:TemplateField HeaderText="">
    <ItemTemplate>
        <asp:ImageButton  ImageUrl="~/img/icons/cross.gif"  width="10" height="10" alt="Cancel" runat="server" ID="btnRemove" CommandName="Remove" CommandArgument='<%# Eval("ProductId") %>'/>
    </ItemTemplate>
    </asp:TemplateField>
    </Columns>

Answer 1

创建一个单独的产品类（c＃代码）：

public class CartProducts
{
    public int ID { get; set; }
    public string ProductName { get; set; }
    public int Quantity { get; set; }
    public decimal Price { get; set; }
    public decimal TotalUnits { get; set; }
    public int CategoryId { get; set; }
    public string CategoryName { get; set; }
    public ProductImages ProductImage { get; set; }

    public decimal TotalItemPrice
    {
        get
        {
            return Price * TotalUnits * Quantity;
        }
    }

    private string _productDesc;
    public string ProductDesc
    {
        get
        {
            return (_productDesc.Length > 100) ? _productDesc.Substring(0, 100) + "...." : _productDesc;
        }
        set
        {

            _productDesc = value;
        }
    }
}

当您从SP获取产品时，在存储过程返回的列表顶部创建一个包装购物车产品列表，在Session

中存储包装类的列表

假设您的SP名称是“GetallProducts”

var products = dbContext.GetallProducts();
List<CartProducts> products = (from prods in products select new CartProducts{
ID = prods.ID ,
ProductName = prods.Name,
Price = prods.Price,
TotalUnits = prods.TotalUnits

}).ToList();

现在创建一个单独的类来处理所有购物车操作，如下所示：

public class Cart
{

    private List<CartProducts> _cartProducts;
    public List<CartProducts> cartProducts
    {
        get
        {
            _cartProducts = SessionService.PullFromSession<List<CartProducts>>        (SessionKeys.Cart);
            if (_cartProducts == null)
            {
                _cartProducts = new List<CartProducts>();
            }
            return _cartProducts;
        }
        set
        {
            _cartProducts = value;

            SessionService.PushToSession(SessionKeys.Cart, _cartProducts);
        }
    }

    public decimal TotalPrice
    {
        get
        {
            return cartProducts.Sum(p => p.TotalItemPrice);
        }
    }


    public void UpdateProduct(int quantity, int productID)
    {
       //Update logic here


    }



    public long PlaceOrder()
    {
        //Place order

    }
}

现在将您的网格绑定到会话中的产品列表，如下所示： private void BindCart（） { //购物车对象

        Cart c = new Cart();
        if (c.cartProducts.Count > 0)
        dlistCart.DataSource = c.cartProducts;
        dlistCart.DataBind();

    }

现在每次在购物车中更新商品时都会使用以下内容：

var txtQuantity = e.Item.FindControl("txtQuantity") as TextBox;
        if (e.CommandName == "update")
        {

            if (txtQuantity != null)
            {
                if (txtQuantity.Text.isInt())
                {
                    var count = txtQuantity.Text.toInt();
                    int ProductID = e.CommandArgument.ToString().toInt();

                    Cart cart = new Cart();
                    cart.UpdateProduct(count, ProductID);
                }
            }
        }

很抱歉，所有代码都在C＃中，因为我不知道VB，我最近在购物车上工作并粘贴代码，但逻辑将保持不变。

希望这会有所帮助

ASP.NET从ShoppingCart的会话变量填写Gridview中的文本字段

1 个答案: