linq 查询分页实例
2010-11-14 08:09:24 来源：WEB开发网核心提示：在项目中需要查询分页，今天发布一个经过测试的实例添加一个linq to sql 类DataClasses.dbml新建一个测试页面PageBreakTest.aspx，linq 查询分页实例，具体代码如下：<%@ Page Language="C#" AutoEventWireup="
在项目中需要查询分页，今天发布一个经过测试的实例
添加一个linq to sql 类DataClasses.dbml
新建一个测试页面PageBreakTest.aspx，具体代码如下：
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="PageBreakTest.aspx.cs" Inherits="PageBreakTest" %>
<%@ Import Namespace="System.Xml.Linq" %>
<%@ Import Namespace="System.Linq" %>
<%
//linq to sql 类
DataClassesDataContext db = new DataClassesDataContext();
string ClassID = Request["ClassID"]; //参数
ClassID = "100";//我这里没有实际参数，根据自己数据表中的数据随便给了一个值
int recordcount = 0;
string StarPage = string.Empty;
%>
<html>
<head runat="server">
<title>Linq分页测试</title>
</head>
<body>
<ul>
<%
try
{
//db.tn_article 数据表
//article_classid 参数对应的字段
var artcleList = from artcle in db.tn_article where artcle.article_classid == int.Parse(ClassID) orderby artcle.article_id descending select artcle;
recordcount = artcleList.Count();
if (recordcount != 0)
{
int Record = string.IsNullOrEmpty(Request["Record"]) ? 20 : int.Parse(Request["Record"]);
int PageNum = string.IsNullOrEmpty(Request["PageNum"]) ? 1 : int.Parse(Request["PageNum"]);
//分页器 PageBreak(每页显示条数，第几页，总记录数，显示页面地址，参数)
StarPage = PageBreak(ref Record, ref PageNum, recordcount, "PageBreakTest.aspx", "<input type=\"hidden\" name=\"ClassID\" value=\"" + Request["ClassID"] + "\"/>");
//无参数情况
//StarPage = PageBreak(ref Record, ref PageNum, recordcount, "PageBreakTest.aspx", "");
//多参数情况
//StarPage = PageBreak(ref Record, ref PageNum, recordcount, "PageBreakTest.aspx", "<input type='hidden' name='numberStr' value='" +Request["ClassID"] + "'/><input type='hidden' name='titleStr' value='" + titleStr + "'/><input type='hidden' name='applydept' value='" + applydept + "'/>");
var ta1 = artcleList.Skip(Record * (PageNum - 1)).Take(Record);
foreach (tn_article ta in ta1)
{
%>
<li>
<%=ta.article_title%></li>
<%
}
}
else
{
Response.Write("<li>没有找到相关信息!</li>");
}
db.Dispose();
}
catch (Exception ex)
{
//db.Dispose();
//Response.Write("<li>请稍候访问！服务器正忙！</li>");
throw new Exception(ex.Message);
}
%>
</ul>
<div>
<%=StarPage%>
</div>
</body>
</html>
后台代码如下（有两个分页方法，一个复杂带跳转，一个简单），当然这两个方法可以放在一个类中任何页面都可以调用
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class PageBreakTest : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
//分页器 PageBreak(每页显示条数，第几页，总记录数，显示页面地址，参数)
public static string PageBreak(ref int Record, ref int PageNum, int RecordMax, string ActionURL, string Hidden)
{
int PageTemp, i, MaxPage;
System.Text.StringBuilder tmpPageBreak = new System.Text.StringBuilder();
if (Record > RecordMax)
{
Record = RecordMax;
}
if (Record < 1)
{
Record = 1;
}
MaxPage = RecordMax / Record;
if (RecordMax % Record > 0)
{
MaxPage = MaxPage + 1;
}
if (PageNum > MaxPage) PageNum = MaxPage;
if (PageNum < 1) PageNum = 1;
tmpPageBreak.AppendFormat("<form method=\"get\" action=\"{0}\">", ActionURL);
tmpPageBreak.Append(Hidden);
tmpPageBreak.Append("<div style=\"float: left;width:26%;padding: 10px 0px 0px 0px;text-align : center;\">");
PageTemp = 1;
if (MaxPage > 1)
{
if (PageNum > 1)
{
tmpPageBreak.Append("<a href=\"#\" onclick=\"JScript:this.parentNode.parentNode.PageNum.value='1';this.parentNode.parentNode.submit();return false;\">首页</a> ");
tmpPageBreak.AppendFormat("<a href=\"#\" onclick=\"JScript:this.parentNode.parentNode.PageNum.value='{0}';this.parentNode.parentNode.submit();return false;\">前页</a>", PageNum - 1);
}
else
{
tmpPageBreak.Append("首页 前页");
}
if (PageNum < MaxPage)
{
tmpPageBreak.AppendFormat(" <a href=\"#\" onclick=\"JScript:this.parentNode.parentNode.PageNum.value='{0}';this.parentNode.parentNode.submit();return false;\">后页</a> ", PageNum + 1);
tmpPageBreak.AppendFormat("<a href=\"#\" onclick=\"JScript:this.parentNode.parentNode.PageNum.value='{0}';this.parentNode.parentNode.submit();return false;\">尾页</a>", MaxPage);
PageTemp = PageNum + 1;
}
else
{
tmpPageBreak.AppendFormat(" 后页 尾页");
}
}
else
{
tmpPageBreak.AppendFormat("首页 前页 后页 尾页");
}
tmpPageBreak.AppendFormat("</div>");
tmpPageBreak.AppendFormat("<div style=\"float: right;width:30%;text-align : center;\">转到:<select name=\"PageNum\">");
for (i = 1; i <= MaxPage; i++)
{
tmpPageBreak.AppendFormat("<option value=\"{0}\"", i);
if (i == PageTemp)
{
tmpPageBreak.Append(" selected=\"selected\"");
}
tmpPageBreak.AppendFormat(">{0}</option>", i);
}
tmpPageBreak.AppendFormat("</select> <button onclick=\"JScript:this.form.submit();\"><img border=\"0\" src=\"{0}/Images/Goto.Gif\" align=\"absbottom\" /> 翻页</button>", "");
tmpPageBreak.Append("</div>");
tmpPageBreak.Append("<div style=\"padding: 3px 0px 0px 0px;text-align : center;\">");
tmpPageBreak.AppendFormat("共{0}条信息 每页<input maxlength=\"4\" class=\"MyText\" valueType=\"integer\" type=\"text\" name=\"Record\" size=\"2\" value=\"{1}\" />条 页次:<span style=\"font-weight:bold;color:red\">{2}</span>/{3}页", RecordMax, Record, PageNum, MaxPage);
tmpPageBreak.Append("</div></form>");
return tmpPageBreak.ToString();
}
public static string PageBreak2(ref int Record, ref int PageNum, int RecordMax, string ActionURL, string Hidden)
{
int PageTemp, i, MaxPage;
System.Text.StringBuilder tmpPageBreak = new System.Text.StringBuilder();
if (Record > RecordMax)
{
Record = RecordMax;
}
if (Record < 1)
{
Record = 1;
}
MaxPage = RecordMax / Record;
if (RecordMax % Record > 0)
{
MaxPage = MaxPage + 1;
}
if (PageNum > MaxPage) PageNum = MaxPage;
if (PageNum < 1) PageNum = 1;
tmpPageBreak.AppendFormat("<form method=\"get\" action=\"{0}\">", ActionURL);
tmpPageBreak.Append(Hidden);
tmpPageBreak.Append("<div style=\"float: left;width:26%;padding: 10px 0px 0px 0px;text-align : center;\">");
PageTemp = 1;
if (MaxPage > 1)
{
if (PageNum > 1)
{
tmpPageBreak.Append("<a href=\"#\" onclick=\"JScript:this.parentNode.parentNode.PageNum.value='1';this.parentNode.parentNode.submit();return false;\">首页</a> ");
tmpPageBreak.AppendFormat("<a href=\"#\" onclick=\"JScript:this.parentNode.parentNode.PageNum.value='{0}';this.parentNode.parentNode.submit();return false;\">前页</a>", PageNum - 1);
}
else
{
tmpPageBreak.Append("首页 前页");
}
if (PageNum < MaxPage)
{
tmpPageBreak.AppendFormat(" <a href=\"#\" onclick=\"JScript:this.parentNode.parentNode.PageNum.value='{0}';this.parentNode.parentNode.submit();return false;\">后页</a> ", PageNum + 1);
tmpPageBreak.AppendFormat("<a href=\"#\" onclick=\"JScript:this.parentNode.parentNode.PageNum.value='{0}';this.parentNode.parentNode.submit();return false;\">尾页</a>", MaxPage);
PageTemp = PageNum + 1;
}
else
{
tmpPageBreak.AppendFormat(" 后页 尾页");
}
}
else
{
tmpPageBreak.AppendFormat("首页 前页 后页 尾页");
}
tmpPageBreak.AppendFormat("</div>");
tmpPageBreak.AppendFormat("<div style=\"float: right;width:30%;text-align: center;display:none;\">转到:<select name=\"PageNum\">");
for (i = 1; i <= MaxPage; i++)
{
tmpPageBreak.AppendFormat("<option value=\"{0}\"", i);
if (i == PageTemp)
{
tmpPageBreak.Append(" selected=\"selected\"");
}
tmpPageBreak.AppendFormat(">{0}</option>", i);
}
tmpPageBreak.AppendFormat("</select> <button onclick=\"JScript:this.form.submit();\"><img border=\"0\" src=\"{0}/Images/Goto.Gif\" align=\"absbottom\" /> 翻页</button>", "");
tmpPageBreak.Append("</div>");
tmpPageBreak.Append("<div style=\"padding: 3px 0px 0px 0px;text-align : center;\">");
tmpPageBreak.AppendFormat("共{0}条信息 每页{1}条 页次:<span style=\"font-weight:bold;color:red\">{2}</span>/{3}页", RecordMax, Record, PageNum, MaxPage);
tmpPageBreak.Append("</div></form>");
return tmpPageBreak.ToString();
}
}
[]
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