IDC资讯中心
using system;
using system.web.ui;
using system.web.ui.webcontrols;
using system.componentmodel;
using system.text;
namespace nslzhpages
{
public class lzhpages : system.web.ui.webcontrols.webcontrol
{
private int _count;//每页显示的记录条数
private int _currentpage;//当前页
private int _allcount;//所有记录条数
private int _showpages;//显示页数
//以下脚本用于从文本框输入页码
private const string scriptstring = "<script language=javascript>\n" +
" function go(ctrl,max)\n" +
" {\n" +
" if(ctrl.value >= 1 && ctrl.value <= max)\n" +
" {\n" +
" var url;\n" +
" var index;\n" +
" url = location.href;\n" +
" index = url.indexof(?);\n" +
" if(index == -1)\n" +
" {\n" +
" }\n" +
" else\n" +
" {\n" +
" url = url.substring(0,index);\n" +
" }\n" +
" location.href = url + ?currentpage= + ctrl.value;\n" +
" }\n" +
" else\n" +
" {\n" +
" alert(您输入的页码必须是符合页面要求的数字,最大值是： + max);\n" +
" return false;\n" +
" }\n" +
" }\n" +
"</script>\n";
[defaultvalue(10),category("customer")]
public int count
{
set
{
if(value <= 0)
_count = 1;
else
_count = value;
}
get
{
return _count;
}
}
[defaultvalue(1),category("customer")]
public int currentpage
{
set
{
if(value < 0)
_currentpage = 1;
else
_currentpage = value;
}
get
{
return _currentpage;
}
}
[defaultvalue(1),category("customer")]
public int allcount
{
get
{
return _allcount;
}
set
{
if(_allcount < 0)
throw new exception("记录总条数不能为负数");
else
_allcount = value;
}
}
[defaultvalue(1),category("customer")]
public int pages//总页数
{
get
{
if(this._allcount % this._count > 0)
return ((int)this._allcount / this._count) + 1;
else
return ((int)this._allcount / this._count);
}
}
[defaultvalue(1),category("customer")]
public int showpages
{
set
{
if(value > 0)
_showpages = value;
else
_showpages = 9;
}
get
{
return _showpages;
}
}
protected override void render(htmltextwriter writer)
{
base.render (writer);
string leftinfo;
stringbuilder centerinfo = new stringbuilder();
//分页条分三部分，leftinfo是最左边的部分，用来显示当前页/总页数，每页显示的记录条数
leftinfo = "页:" + this.currentpage.tostring() + "/" + this.pages.tostring() + " " + "每页" + this.count.tostring() + "条" + " 共" + this.allcount.tostring() + "条";
//中间的部分是分页部分
int min;//要显示的页面数最小值
int max;//要显示的页面数最大值
if(this.currentpage > this.pages)//当前页必须小于最大页
{
this.currentpage = this.pages;
}
if(this.currentpage % this.showpages == 0) //如果恰好整除
{
min = this.currentpage + 1;
max = this.currentpage + this.showpages ;
}
else if(this.currentpage % this.showpages == 1 && this.currentpage > this.showpages )
{
min = (((int)this.currentpage / this.showpages ) – 1) * this.showpages +1;
max = this.currentpage – 1;
}
else
{
min = ((int)this.currentpage / this.showpages) * this.showpages + 1;
max = (((int)this.currentpage / this.showpages) +1) * this.showpages;
}
string numberstr = " ";//循环生成数字序列部分
string absurl;//url?左边的部分
absurl = this.context.request.url.tostring();
if(absurl.indexof("?") == -1)
{
}
else
{
absurl = absurl.substring(0,absurl.indexof("?"));
}
for(int i = min ; i <= max ; i++)
{
if(i <= this.pages)//只有不大于最大页才显示
{
if(this.currentpage == i)//如果是当前页，用斜体和红色显示
{
numberstr = numberstr + "<a href=" + absurl + "?currentpage=" + i.tostring() + ">" + "<i style=color:red>" + i.tostring() + "</i>" +"</a>" + "\n";
}
else
{
numberstr = numberstr + "<a href=" + absurl + "?currentpage=" + i.tostring() + ">" + i.tostring() +"</a>" + "\n";
}
}
}
//第一页，上一页，下一页,最后一页
string first,previous,next,last;
first = absurl + "?currentpage=1";
/////////
if(this.currentpage == 1)
previous = absurl + "?currentpage=1";
else
previous = absurl + "?currentpage=" + (this.currentpage – 1).tostring();
/////////
if(this.currentpage == this.pages)
next = absurl + "?currentpage=" + this.pages;
else
next = absurl + "?currentpage=" + (this.currentpage + 1).tostring();
/////////
last = absurl + "?currentpage=" + this.pages;
centerinfo.appendformat("<font face=webdings style=font-size:14px><a href={0}>7</a><a href={1}>3</a></font>{2}<font face=webdings style=font-size:14px><a href={3}>4</a><a href={4}>8</a></font>",first,previous,numberstr,next,last);
stringbuilder sb = new stringbuilder();//html字符串
sb.appendformat("<table style = font-size:12px border=0 cellpadding=0 cellspacing=0 width=100%> \n " +
"<tr>\n" +
"<td width=25% align=left>{0}</td>\n" +
"<td width=61% align=right>{1}</td>\n" +
"<td width=14% align=right><input type=text name=t1 size=4 style=border-bottom:solid 1pt gray;border-top :solid 1pt gray; border-left:solid 1pt gray;border-right:solid 1pt gray;> \n <input type=button name=b1 size=6 value=go style=border-bottom:solid 1pt gray;border-top :solid 1pt gray; border-left:solid 1pt gray;border-right:solid 1pt gray; onclick=go(t1,{2})></td>\n" +
"</tr>\n" +
"</table>",leftinfo,
centerinfo.tostring(),
this.pages);
writer.write(sb.tostring());
}
protected override void onprerender(eventargs e)
{
base.onprerender (e);
if(!page.isclientscriptblockregistered("werew-332dfaf-fdafdsfdsafd"))
{
page.registerclientscriptblock("werew-332dfaf-fdafdsfdsafd",scriptstring);
}
}
}
}
