用ViewState 怎么实现升序降序排列,急

Question

就是单击一个按钮,让Repeater里的值升序降序排列

Answer 1

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;using MyBookShopBLL;
using MyBookShopModels;public partial class BookList : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if(!Page.IsPostBack) {
            ViewState["page"] = 0;
            ViewState["order"] = "";
            ViewState["updown"] = "";       //升序还是降序
            try
            {
                ViewState["typeId"] = Convert.ToInt32(Request.QueryString.Get("typeId"));
            }
            catch 
            {
                ViewState["typeId"] = -1;
            }
            DataBind();
        }
    }    /// <summary>
    /// 数据的邦定
    /// </summary>
    private void DataBind() {
        PagedDataSource pdsBooks = new PagedDataSource();
        pdsBooks.DataSource = BookManager.GetOrderedSmallBooksByCategoryId(Convert.ToInt32(ViewState["typeId"].ToString()), ViewState["order"].ToString(), ViewState["updown"].ToString());
        pdsBooks.AllowPaging = true;
        pdsBooks.PageSize = 4;
        pdsBooks.CurrentPageIndex = Pager;
        lblCurrentPage.Text = "第 " + (pdsBooks.CurrentPageIndex + 1).ToString() + " 页 共 " + pdsBooks.PageCount.ToString() + " 页 总共："+pdsBooks.DataSourceCount.ToString()+" 页";
        SetEnable(pdsBooks);
        dlBooks.DataSource = pdsBooks;
        dlBooks.DataBind();
    }    /// <summary>
    /// 按钮的可用性
    /// </summary>
    /// <param name="pdsBooks"></param>
    private void SetEnable(PagedDataSource pdsBooks)
    {
        btnPrev.Enabled = true;
        btnNext.Enabled = true;
        if(pdsBooks.IsFirstPage) {
            btnPrev.Enabled = false;
        }
        if(pdsBooks.IsLastPage) {
            btnNext.Enabled = false;
        }
    }    //当前页
    private int Pager
    {
        get {
            return (int)ViewState["page"];
        }
        set {
            ViewState["page"] = value;
        }
    }    /// <summary>
    /// 上一页
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    protected void btnPrev_Click(object sender, EventArgs e)
    {
        Pager--;
        DataBind();
    }    /// <summary>
    /// 下一页
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    protected void btnNext_Click(object sender, EventArgs e)
    {
        Pager++;
        DataBind();
    }    /// <summary>
    /// 根据出版日期排序
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    protected void btnDate_Click(object sender, EventArgs e) {
        ViewState["order"] = "PublishDate";
        Pager = 0;
        btnDate.Enabled = false;
        btnPrice.Enabled = true;
        DataBind();
    }    /// <summary>
    /// 根据价格排序
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    protected void btnPrice_Click(object sender, EventArgs e) {
        ViewState["order"] = "UnitPrice";
        Pager = 0;
        btnPrice.Enabled = false;
        btnDate.Enabled = true;
        DataBind();
    }    /// <summary>
    /// 用户定义页数
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    protected void btnGo_Click(object sender, EventArgs e)
    {
        try
        {
            Pager = int.Parse(this.txtGo.Text.ToString());
        }
        catch (Exception ex)
        {
            return;
        }
        
        Pager -= 1;
        DataBind();
    }    /// <summary>
    /// 升序还是降序 
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    protected void ddlUpDown_SelectedIndexChanged(object sender, EventArgs e)
    {
        string flag = this.ddlUpDown.SelectedValue.ToString();
        if (flag == "2")
        {
            ViewState["updown"] = "desc";
        }
        else {
            ViewState["updown"] = "";
        }
        DataBind();
    }
}

Answer 2

本来想给你个测试过的代码来，我的数据没帮定上，呵呵，给你关键代码自己去试吧。if (!Page.IsPostBack)
        {
            ViewState["SortOrder"] = "OrdersID";
            ViewState["OrderDire"] = "DESC";
            BindData();
        }
 private void BindData()
    {   ///获取数据
        DataSet ds = myOrders.Get_SalesColorOrders_List(SalesID);
        ///显示数据
        ///
        DataView dv = ds.Tables[0].DefaultView;
        string sort = (string)ViewState["SortOrder"] + " " + (string)ViewState["OrderDire"];
        dv.Sort = sort;
        gvOrders.DataSource = dv;
        gvOrders.DataBind();
    }
//单击事件
protected void Click(object sender, EventArgs e)
{
    ViewState["OrderDire"] = "ASE";
    BindData();
}
怎么扩展自己想办法吧