在嵌套的itemrepeater ASP.NET 4中显示集合中的嵌套对象

时间：2013-11-14 10:08:26

标签： c# asp.net

我的购物车类

public class Cart
{
    [Key]
    public int CartID { get; set; }

    [Required]
    public int BillID { get; set; }

    [Required]
    [ForeignKey("BillID")]
    public virtual Bill Bill { get; set; }

    public virtual ICollection<CartItems> Products {get; set;}
}

我的CartItems类

public class CartItems
    {
        [Key]
        public int CartItemID { get; set; }

        [Required]
        public int ProductId { get; set; }

        [ForeignKey("ProductId")]
        public Product Product { get; set; }

        [Required]
        public int Qunatity { get; set; }
    }

我填充内部转发器的查询如下所示：

List<AdminCartItems> items = (from c in context.Carts
                                              where c.Bill.Date == currentDate
                                              select new AdminCartItems
                                              {
                                                  Products = c.Products,
                                                  BillNo = c.Bill.BillNumber,
                                                  Orderer = c.Bill.Name + ", " + c.Bill.Adress + ", " + c.Bill.PostalCode + " " + c.Bill.Country,
                                                  Sum = c.Products.Sum(x => x.Qunatity * x.Product.Price)
                                              }).ToList();

            CartRepeater.DataSource = items;
            this.DataBind();

public class AdminCartItems
    {
        public ICollection<CartItems> Products {get; set;}
        public int BillNo {get; set;}
        public string Orderer {get; set; }
        public double Sum {get; set;}
    }

aspx页面如下所示：

<asp:Repeater ID="CartRepeater" runat="server"> 
    <ItemTemplate>
        <p><b>Broj računa: </b><%# Eval("BillNo")%></p>
        <p><b>Naručioc: </b><%# Eval("Orderer")%></p>
        <br />

        <table class="table">
        <tr>
            <th><center><b>Slika</b></center></th>
            <th><center><b>Proizvod</b></center></th>
            <th><center><b>Količina</b></center></th>
            <th><center><b>Cena</b></center></th>
            <th><center><b>Ukupno</b></center></th>
        </tr>
        <asp:Repeater ID="ItemRepeater" runat="server" DataSource='<%# Eval("Products") %>' > 
                <ItemTemplate>
                    <tr>
                        <td>
                            <center><img src="/DBImages/<%# Eval("Product.Image") %>.png" class="productImage"/></center>
                        </td>
                        <td style="text-align:right">
                            <center><p><b>Proizvođač: </b><%# Eval("Product.Manufacturer.Name")%></p></center>
                            <center><p><b>Naziv: </b><%# DataBinder.Eval(Container.DataItem, "ProductID" %></p></center>
                        </td>
                        <td style="text-align:right">
                            <center><p><%# Eval("Qunatity")%></p></center>
                        </td>
                        <td style="text-align:right">
                            <center><p><%# Eval("Product.Price")%></p></center>
                        </td>
                        <td style="text-align:right">
                            <%--<center><p><%# Eval("Qunatity")%></p></center>--%>
                        </td>
                    </tr>
            </ItemTemplate>
        </asp:Repeater>
        </table>
        <b style="float: right; font-size:larger; margin-right: 30px;">
            Svega: <%# Eval("Sum")%> RSD
        </b>
    <br />
    <hr />
    </ItemTemplate>
</asp:Repeater>

我的问题是：如何在内部转发器中显示Product对象的属性。

我的产品对象如下所示：

public class Product
{
    [Key]
    public int ProductID { get; set; }

    [Required]
    public string Name { get; set; }

    [Required]
    public double Price { get; set; }

    [Required]
    public string Quantity { get; set; }

    public string Description { get; set; }

    [Required]
    public bool OnSale { get; set; }

    public double SalePrecent { get; set; }

    [Required]
    public int Image { get; set; }

    [Required]
    public int Stock { get; set; }

    [Required]
    public int CategoryID { get; set; }

    [ForeignKey("CategoryID")]
    public virtual Category Category { get; set; }

    [Required]
    public int ManufacturerID { get; set; }

    [ForeignKey("ManufacturerID")]
    public virtual Manufacturer Manufacturer { get; set; }
}

3 个答案:

答案 0 :(得分：1)

当您声明外部转发器时，您应该处理OnItemDataBound事件，并在此事件中Databind您的内部转发器

外转发器：

<asp:Repeater runat="server" id="CartRepeater" OnItemDataBound="CartRepeater_ItemDataBound">
...
</asp:Repeater>

代码背后：

protected void CartRepeater_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
if (e.Item.ItemType != ListItemType.Item && e.Item.ItemType != ListItemType.AlternatingItem) return;

var item = (CartItems) e.Item.DataItem;

var repeater = (Repeater) e.Item.FindControl("ItemRepeater");

repeater.DataSource = item.Products;
repeater.DataBind();
}

您的Eval("Product.SomeProperty")表达式不需要。从字符串中删除Product.位，例如：

<%# Eval("Product.Image") %>变为<%# Eval("Image") %>

答案 1 :(得分：0)

您将内部转发器绑定到产品：

<asp:Repeater ID="ItemRepeater" runat="server" DataSource='<%# Eval("Products") %>' >

因此内部转发器中的每个绑定DataItem都是Product。因此，而不是：

 <center><p><b>Proizvođač: </b><%# Eval("Product.Manufacturer.Name")%></p></center>

您应该指定：

 <center><p><b>Proizvođač: </b><%# Eval("Manufacturer.Name")%></p></center>

答案 2 :(得分：0)

正如您所见，我更新了问题，因此现在有一个AdminCartsItem类。外部转发器从那里获取数据源：

List<AdminCartItems> items = (from c in context.Carts
                                              where c.Bill.Date == currentDate
                                              select new AdminCartItems
                                              {
                                                  Product = c.Products.Select(x => x.Product),
                                                  BillNo = c.Bill.BillNumber,
                                                  Orderer = c.Bill.Name + ", " + c.Bill.Adress + ", " + c.Bill.PostalCode + " " + c.Bill.Country,
                                                  Sum = c.Products.Sum(x => x.Qunatity * x.Product.Price),
                                                  Pices = (int)c.Products.Select(x => x.Qunatity).FirstOrDefault(),
                                                  Total = (c.Products.Select(x => x.Product.Price)).FirstOrDefault() * (int)c.Products.Select(x => x.Qunatity).FirstOrDefault()
                                              }).ToList();

内部转发器ItemDataBound事件如下所示：

protected void CartRepeaterItemDataBound(object sender, RepeaterItemEventArgs e)
        {
            if (e.Item.ItemType != ListItemType.Item && e.Item.ItemType != ListItemType.AlternatingItem) return;

            var item = (AdminCartItems)e.Item.DataItem;

            var repeater = (Repeater)e.Item.FindControl("ItemRepeater");

            repeater.DataSource = item.Product;
            repeater.DataBind();
        }

HTML现在看起来像这样：

<asp:Repeater ID="CartRepeater" runat="server" OnItemDataBound="CartRepeaterItemDataBound"> 
        <ItemTemplate>
            <p><b>Broj računa: </b><%# Eval("BillNo")%></p>
            <p><b>Naručioc: </b><%# Eval("Orderer")%></p>
            <br />

            <table class="table">
            <tr>
                <th><center><b>Slika</b></center></th>
                <th><center><b>Proizvod</b></center></th>
                <th><center><b>Pakovenje</b></center></th>
                <th><center><b>Cena</b></center></th>
                <th><center><b>Količina</b></center></th>
                <th><center><b>Ukupno</b></center></th>
            </tr>
            <asp:Repeater ID="ItemRepeater" runat="server" > 
                    <ItemTemplate>
                        <tr>
                            <td>
                                <center><img src="/DBImages/<%# Eval("Image") %>.png" class="productImage"/></center>
                            </td>
                            <td style="text-align:right">
                                <center><p><b>Proizvođač: </b><%# Eval("Manufacturer.Name")%></p></center>
                                <center><p><b>Naziv: </b><%# Eval("Name")%></p></center>
                            </td>
                            <td style="text-align:right">
                                <center><p><%# Eval("Quantity")%></p></center>
                            </td>
                            <td style="text-align:right">
                                <center><p><%# Eval("Price")%></p></center>
                            </td>
                            <td style="text-align:right">
                                <center><p><%# DataBinder.Eval(Container.Parent.Parent, "DataItem.Pices")%> </p></center>
                            </td>
                            <td style="text-align:right">
                                <center><p><%# DataBinder.Eval(Container.Parent.Parent, "DataItem.Total")%> </p></center>
                            </td>
                        </tr>
                    </ItemTemplate>
            </asp:Repeater>
            </table>
            <b style="float: right; font-size:larger; margin-right: 30px;">
                Svega: <%# Eval("Sum")%> RSD
            </b>
        <br />
        <hr />
        <hr />
        </ItemTemplate>
    </asp:Repeater>

希望这会有所帮助。

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