分页排序等

分页 排序等using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class 分页_Default : System.Web.UI.Page
{
    int pagesize = 10;
    protected void Page_Load(object sender, EventArgs e)
    {
        ViewState["pagesize"] = 10;
        pagesize = Convert.ToInt32(ViewState["pagesize"]);
        if (!IsPostBack)
        {
            this.BookListBinds(Convert.ToInt32(ViewState["pagesize"]));
        }
    }
    //当前页
    protected int PageIndex
    {
        get 
        {
            if (ViewState["PageIndex"] == null)
            {
              ViewState["PageIndex"]=0;
            }
            return (int)ViewState["PageIndex"];
        }
        set {
            ViewState["PageIndex"] = value;
        }
    }
    protected void BookListBinds(int pagesize)
    {
        //创建分页类
        PagedDataSource pds = new PagedDataSource();
        //启用分页
        pds.AllowPaging = true;
        //将数据绑定给分页
        System.Data.DataView dv = DBHelper.GetDataTable("select * from Books").DefaultView;
        //设置排序
        dv.Sort = Sort;
        
        pds.DataSource = dv;
        //设置当前页
        pds.CurrentPageIndex = PageIndex;
        //设置一页显示多少行数据
        pds.PageSize = pagesize;
        //保存当前总页数
        ViewState["PageCount"] = pds.PageCount;
        //将分页后的数据绑定到Repeater
        Repeater1.DataSource = pds;
        Repeater1.DataBind();
        //绑定当前页和总页数
        l1.Text = (PageIndex + 1).ToString();
        l2.Text = pds.PageCount.ToString();
        //启用按钮
        this.btnEnable(pds);
    }
    //禁用按钮方法
    protected void btnEnable(PagedDataSource pds)
    {
        btnF.Enabled = true;
        btnU.Enabled = true;
        btnN.Enabled = true;
        btnL.Enabled = true;
        //判断是否是首页
        if (pds.IsFirstPage)
        {
            btnF.Enabled = false;
            btnU.Enabled = false;
        }
        if (pds.IsLastPage)
        {
            btnN.Enabled = false;
            btnL.Enabled = false;
        }
    }
    //分页按钮
    protected void PageCommand(object sender, CommandEventArgs e)
    {

        if (e.CommandName=="btnF")
        {
            PageIndex =0;
        }
        else if (e.CommandName == "btnU")
        {
            PageIndex--;
        }

        else if (e.CommandName=="btnN")
        {
            PageIndex++;
        }
        else if (e.CommandName=="btnL")
        {
            PageIndex = Convert.ToInt32(ViewState["PageCount"]) - 1;
        }
        //重新绑定数据
        this.BookListBinds(Convert.ToInt32(ViewState["pagesize"]));
    }
    //按几行排列
    protected void pagesizeBind(object sender, CommandEventArgs e)
    {
        if (e.CommandName=="15")
        {
            ViewState["pagesize"] = 15;
        }
        else if (e.CommandName == "20")
        {
            ViewState["pagesize"] = 20;
        }
        else if (e.CommandName == "50")
        {
            ViewState["pagesize"] = 50;
        }
        else
        {
            ViewState["pagesize"] = 10;
        }
        this.BookListBinds(Convert.ToInt32(ViewState["pagesize"]));

    }
    protected string Sort
    {
        get
        {
            if (ViewState["Sort"]==null)
            {
                ViewState["Sort"] = "ID";
            }
            return ViewState["Sort"].ToString();
        }
        set 
        {
            ViewState["Sort"] = value;
        }
    } 
    //按时间排序
    protected void btnTime_Click(object sender, EventArgs e)
    {
       Orientation("PublishDate");
        this.BookListBinds(Convert.ToInt32(ViewState["pagesize"]));
    }
    //按单价排序
    protected void PriceBtn_Click(object sender, EventArgs e)
    {
        Orientation("UnitPrice");
        this.BookListBinds(Convert.ToInt32(ViewState["pagesize"]));
    }
    //排序方向
    protected void Orientation(String columns)
    {
        if (Sort == (columns + "asc"))
        {
            Sort = columns + "desc";
        }
        else
        {
            Sort = columns + " asc";
        }
    }
}

___________________________________________-

public class StringHandler
{

    //获取ISBN图书图片
    public static string CoverURL(object ISBN)
    {
        return "BooKCovers/" + ISBN.ToString().Trim() + ".jpg";
    }

    //详情页面内容过多时
    public static String CutString(object content, int num)
    {
        if (content.ToString().Length>num)
        {
            return content.ToString().Substring(0, num)+"....";
        }
        return content.ToString();
    }