幻想曲.Net

pplive上的所有分页方式要进行变更
目前的分页是一次性显示出所有的分页
现在要进行改动


实际上很简单
只是一个起始页和终止页的计算问题

using System;
using System.Data;
using System.Configuration;
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;

/// <summary>
/// Pager 的摘要说明
/// </summary>
public class Pager
{
	public Pager()
	{
		//
		// TODO: 在此处添加构造函数逻辑
		//
	}
    public int PageIndex
    {
        set
        {
            if (value > 0)
                this._current_pageindex = value;
            else
                this._current_pageindex = 1;
        }
        get
        {
            return this._current_pageindex;
        }
    }
    public int PageCount
    {
        get
        {
            return this._page_count;
        }
        set
        {
            this._page_count = value;
        }
    }
    public string PageParam
    {
        set { this._page_param = value; }
    }
    private string _page_param;

    private int _current_pageindex = 1;  //当前页码
    private int _page_count;
    private int _per_num = 10;   //当前页要显示多少页码
    private int _next_num = 9;   //当前页之后要显示多少页码
    private string _pre_text = "上一页";
    private string _next_text = "下一页";
    private System.Text.StringBuilder sb = new System.Text.StringBuilder(1000);
    /// <summary>
    /// Pager分页类的构造
    /// </summary>
    /// <param name="pageindex">当前页码,从1开始</param>
    /// <param name="pagecount">总页数</param>
    /// <param name="param">分页参数</param>
    public Pager(int pageindex, int pagecount,string param)
    {
        this._current_pageindex = pageindex;
        this._page_count = pagecount;
        this._page_param = param;
    }
    public string ShowPager()
    {

        if (_current_pageindex > 1)
            sb.Append(string.Format("<a href=\"{0}\">{1}</a>", _page_param.Replace("$$",(_current_pageindex-1).ToString()), _pre_text));
        int min = _current_pageindex - _per_num;  //计算起始页
        int max = _current_pageindex + _next_num;   //计算终止页
        for (int i = min; i <= max; i++)
        {
            if (i < 1)
                continue;
            if (i > _page_count)
                break;
            if(_current_pageindex!=i)
               sb.Append(string.Format("<a href=\"{0}\">{1}</a>",_page_param.Replace("$$",i.ToString()),i));
            else
               sb.Append(string.Format("<span>{0}</span>", i));
           
        }
        if (_current_pageindex < _page_count)
            sb.Append(string.Format("<a href=\"{0}\">{1}</a>", _page_param.Replace("$$", (_current_pageindex+1).ToString()),_next_text));
        return sb.ToString();
    }
}

调用
protected void Page_Load(object sender, EventArgs e)
{
int page = 1;
if (Request.QueryString["page"] != null)
page = int.Parse(Request.QueryString["page"]);
Pager pager = new Pager(page, 83,"tag,$$.html");
this._lbl_pager.Text = pager.ShowPager();
}