repeater的疑难症

[qianlanglearn]

我在网页的左侧做了一个repeater，想用它实现用户浏览过的商品。想实现这样的问题。1.用户点击的商品会在repeater里面显示，只显示头十个，而且最后点击的商品放在最上面，依次类推。2.如果我点击repeater里面的第5个商品，那么第5个商品就放到了第一个位置。

[weiphone]

每次点击 不存在就插入 时间自动 已经存在就更新时间为最新！ 点击事件最后面再重新绑定 一下就好了

[drummery]

lz试下这段代码，基本思路是建立一个队列类，定义两个基本方法：Push() 和SetTop(), 并在Session中缓存这个队列类。
前台

    <form id="form1" runat="server">
    <div>
   <asp:Repeater ID="rptCart" runat="server" OnItemCommand="rptCart_ItemCommand">
   <HeaderTemplate><ul></HeaderTemplate>
   <ItemTemplate>
   <li><asp:LinkButton ID="btnProuduct" runat="server" CommandName="SetTop" Text='<%# Eval("Name") %>' /></li>
   </ItemTemplate>
   <FooterTemplate></ul></FooterTemplate>
   </asp:Repeater>
   <asp:TextBox ID="editProduct" runat="server" />
   <asp:Button ID="btnAdd" runat="server" Text="Add product to cart." OnClick="btnAdd_Click" /> 
    
    </div>
    </form>

后台

public partial class Default2 : System.Web.UI.Page
{
    private CProductQueue _queue = null;
    /// <summary>
    /// Use session to record the custmolized items.
    /// </summary>
    protected CProductQueue Queue
    {
        get
        {
            if (Session["Queue"] == null)
            {
                _queue = new CProductQueue(3);
                Session["Queue"] = _queue;
            }
            else
            {
                _queue = Session["Queue"] as CProductQueue;
            }
            return _queue;
        }
    }

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            BindRepeater();
        }
    }

    protected void btnAdd_Click(object sender, EventArgs e)
    {
        Queue.Push(new CProduct(editProduct.Text.Trim()));
        BindRepeater();
    }

    protected void rptCart_ItemCommand(object source, RepeaterCommandEventArgs e)
    {
        switch (e.CommandName)
        {
            case "SetTop":
                Queue.SetTop(e.Item.ItemIndex);
                break;
        }
        BindRepeater();
    }

    private void BindRepeater()
    {
        rptCart.DataSource = Queue.Products;
        rptCart.DataBind();
    }
}

public class CProduct
{
    private string _name = "";

    public string Name
    {
        get { return _name; }
        set { _name = value; }
    }

    public CProduct(string name)
    {
        _name = name;
    }

    public override string ToString()
    {
        return string.Format("Product: Name={1}", _name);
    }
}

public class CProductQueue
{
    private ArrayList listProducts = null;
    private int _maxLength;

    public CProductQueue(int maxLength)
    {
        listProducts = new ArrayList();
        _maxLength = maxLength;
    }
    public CProductQueue()
    {
        _maxLength = 10;
    }

    public CProduct this[int index]
    {
        get { return IsIndexValid(index) ? listProducts[index] as CProduct : null ; }
        set 
        {
            if (IsIndexValid(index))
            {
                listProducts[index] = value;
            }
        }
    }

    public ArrayList Products
    {
        get
        {
            return listProducts;
        }
    }

    public void Push(CProduct prodcut)
    {
        // Inset at first position.
        listProducts.Insert(0, prodcut);
        if (listProducts.Count > _maxLength)
        {
            // Remove the last one if the length exceeds.
            listProducts.RemoveAt(_maxLength);
        }
    }

    /// <summary>
    /// Sets the product with the specific index top of the query.
    /// </summary>
    public void SetTop(int index)
    {
        if (IsIndexValid(index) && index > 0)
        {
            CProduct origin = listProducts[index] as CProduct;
            CProduct product = new CProduct(origin.Name);
            listProducts.RemoveAt(index);
            Push(product);
        }
    }

    private bool IsIndexValid(int index)
    {
        return (index < listProducts.Count && index >= 0);
    }
}

[大正他爹]

点击触发一个点击时间，再接时间排序。