KMCT名字的由來，這是我在Blog中的第一篇關於控件的文章，在此我將對我的控件做一個申明，控件 名字以我的Blog名字各項的首字母命名(Keyboard,Mouse,Cigarette,Tea )希望大家在以後看我的控件的 時候能想到我的Blog。同時我選擇了開源，開源更能促進技術的發展，也更能到達資源共享的目的。
廢話少說、直接進入主題，今天整理的是分頁控件，這個控件誕生將近一年了，是我和我的一個同事 共同開發，現在被廣泛用於公司的各個項目中。控件基於.net 2.0 開發。
先從宏觀上分析一下分頁控件：作為分頁控件應該具有每一頁的大小（Pagesize）、總頁數 （TotalPage）等屬性。
從實現上說我們在以前的分頁過程中都是像這樣傳遞參數xxxx.aspx?page=1，那麼我們只要改變page 參數的值便可以實現分頁的效果，因此我們只需要繼承System.Web.UI.Control控件並重寫Render()方法 即可實現該功能。
貼出代碼：
using System;
using System.Text;
using System.Text.RegularExpressions;
namespace KMCT.Control
{
/// <summary>
/// 該控件為分頁控件，其特點是分頁方便，輕量級
/// </summary>
public class Pager : System.Web.UI.Control
{
private int _pageSize, _totalPage;
private static readonly Regex RX;
private string query;
private int curretPage;
private int myTotalPage;
//Filed
public int TotalPage
{
get { return _totalPage; }
set { _totalPage = value; }
}
public int PageSize
{
get { return _pageSize; }
set { _pageSize = value; }
}
static Pager() { RX = new Regex(@"^&page=\d+", RegexOptions.Compiled); }
public Pager()
{
query = Context.Request.Url.Query.Replace("?", "&");
query = RX.Replace(query, string.Empty);
string myPage = Context.Request["page"];
if (string.IsNullOrEmpty(myPage))
curretPage = 0;
else
{
try
{
curretPage = int.Parse(myPage);
}
catch
{
Context.Response.Redirect(Regex.Replace
(Context.Request.Url.ToString(), @"page=[^&]+", "page=0"));
}
}
}
protected override void Render(System.Web.UI.HtmlTextWriter writer)
{
if ((this._totalPage % this._pageSize) == 0)
{
myTotalPage = this._totalPage / this._pageSize;
}
else
myTotalPage = this._totalPage / this._pageSize + 1;
string str = "<div class='digg'>";
if (this._pageSize > this._totalPage)
{
str += "";
}
else
{
if (this._totalPage <= this._pageSize * 10)
{
if (this.curretPage == 0)
str += "<span class='disabled'> <
</span>";
else
str += "<a href='?page=" + (curretPage -
1) + this.query + "'> < </a>";
for (int i = 0; i < myTotalPage; i++)
{
if (curretPage == i)
str += "<span class='current'>"
+ (i + 1) + "</span>";
else
str += "<a href='?page=" + i +
this.query + "'>" + (i + 1) + "</a>";
}
if (this.curretPage < myTotalPage - 1)
str += "<a href='?page=" + (curretPage +
1) + this.query + "'> > </a>";
else
str += "<span class='disabled'> >
</span>";
}
else
{
if (this.curretPage == 0)
str += "<span class='disabled'> <
</span>";
else
str += "<a href='?page=" + (curretPage -
1) + this.query + "'> < </a>";
if (this.curretPage < 4)
{
for (int i = 0; i < 5; i++)
{
if (curretPage == i)
str += "<span
class='current'>" + (i + 1) + "</span>";
else
str += "<a href='?page=" +
i + this.query + "'>" + (i + 1) + "</a>";
}
str += "<a href='?page=" + myTotalPage +
this.query + "'>" + myTotalPage + "</a>";
}
else if (this.curretPage >= 4 &&
this.curretPage < myTotalPage - 6)
{
str += "<a href='?page=1" + this.query +
"'>1</a>";
for (int i = -2; i < 3; i++)
{
if (i == 0)
str += "<span
class='current'>" + (this.curretPage + 1) + "</span>";
else
str += "<a href='?page=" +
(this.curretPage + i) + this.query + "'>" + (this.curretPage + 1 + i) + "</a>";
}
str += "<a href='?page=" + (myTotalPage -
1) + this.query + "'>" + myTotalPage + "</a>";
}
else if (curretPage > myTotalPage + 1)
{
Context.Response.Redirect(Regex.Replace
(Context.Request.Url.ToString(), @"page=\d+", "page=" + (myTotalPage - 1)));
}
else
{
str += "<a href='?page=1" + this.query +
"'>1</a>";
for (int i = 6; i > 0; i--)
{
if (curretPage == myTotalPage - i)
str += "<span
class='current'>" + (myTotalPage - i + 1) + "</span>";
else
str += "<a href='?page=" +
(myTotalPage - i) + this.query + "'>" + (myTotalPage - i + 1) + "</a>";
}
}
if (this.curretPage < myTotalPage - 1)
str += "<a href='?page=" + (curretPage +
1) + this.query + "'> > </a>";
else
str += "<span class='disabled'> >
</span>";
}
}
str += "</div>";
writer.Write(str);
}
}
}
