这篇文章给大家介绍asp.net 中怎么异步加载数据，内容非常详细，感兴趣的小伙伴们可以参考借鉴，希望对大家能有所帮助。
1、准备工作
引入“jquery-1.8.3.min.js”，AjaxPro.2.dll”：用于前台js调用后台方法。
2、Web.config的配置
复制代码 代码如下:
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<connectionStrings>
<clear/>
<!-- 数据库链接 -->
<add name="connSwtLoginLog" connectionString="Server=DUWEI\SQL2005;Database=SwtLoginLog;user id=sa;password=111111;Connect Timeout=120;pooling=true;min pool size=5;max pool size=10"/>
</connectionStrings>
<system.web>
<compilation debug="true" targetFramework="4.0" />
<!-- 页面调用后台方法 -->
<httpHandlers>
<add verb="POST,GET" path="ajaxpro/*.ashx" type="AjaxPro.AjaxHandlerFactory,AjaxPro.2"/>
</httpHandlers>
</system.web>
</configuration>
3、目录结构 
下面就直接上代码了。
4、Login.aspx页面代码
复制代码 代码如下:
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Login.aspx.cs" Inherits="AspNet.Login" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<script src="js/jquery-1.8.3.min.js" type="text/javascript"></script>
<script type="text/javascript">
function initTable(dt) {
var str = '<table border="1px">'
+ '<tr>'
+ '<td>'
+ 'LoginID'
+ '</td>'
+ '<td>'
+ 'SwtID'
+ '</td>'
+ '<td>'
+ 'UserName'
+ '</td>'
+ '<td>'
+ 'IP'
+ '</td>'
+ '<td>'
+ 'Address'
+ '</td>'
+ '<td>'
+ 'LogTime'
+ '</td>'
+ '<td>'
+ 'LogType'
+ '</td>'
+ '</tr>';
for (var i = 0; i < dt.Rows.length; i++) {
str = str + '<tr>'
+ '<td>'
+ dt.Rows[i]['LoginID']
+ '</td>'
+ '<td>'
+ dt.Rows[i]['SwtID']
+ '</td>'
+ '<td>'
+ dt.Rows[i]['UserName']
+ '</td>'
+ '<td>'
+ dt.Rows[i]['IP']
+ '</td>'
+ '<td>'
+ dt.Rows[i]['Address'] + dt.Rows[i]['Address2']
+ '</td>'
+ '<td>'
+ dt.Rows[i]['LogTime']
+ '</td>'
+ '<td>'
+ dt.Rows[i]['LogType']
+ '</td>'
+ '</tr>'
}
str = str + '</table>';
$("#d1").html(str);
}
function firtPage(page) {
$("#pageNo").text(page);
var dt = AspNet.Login.FindDate(page).value;
initTable(dt);
}
//定义一个当前页初始为1
var pageNo = 1;
//总页数
var totalPage = <%=pageCount %>;
function showContent(op) {
if (op == "first") {
pageNo = 1;
}
else if (op == "previous") {
if (pageNo > 1)
pageNo -= 1;
else
pageNo = 1;
}
else if (op == "next") {
if (pageNo < totalPage - 1)
pageNo += 1;
else
pageNo = totalPage - 1;
}
else if (op == "last") {
pageNo = totalPage - 1;
}
else if(op=="jump"){
var jump = $("#jump").val();
if(jump<1 || jump>totalPage){
pageNo = 1;
}else{
pageNo = jump;
}
}
else {
pageNo = 1;
}
firtPage(pageNo);
}
$(function () {
showContent("first");
});
</script>
</head>
<body>
<form id="form1" runat="server">
<div id="d1" align="center"></div>
<div align="center">
<span id="sp_ShowContent">
第<label id="pageNo"></label>页|共<%=pageCount%>页
|<a onclick="showContent('first');" href="javascript:void(0);">首页</a>
|<a onclick="showContent('previous');" href="javascript:void(0);">上一页</a>
|<a onclick="showContent('next');" href="javascript:void(0);">下一页</a>
|<a onclick="showContent('last');" href="javascript:void(0);">尾页</a>
|跳到<input id="jump"/><a onclick="showContent('jump');" href="javascript:void(0);">GO</a>
</span>
</div>
</form>
</body>
</html>
后台代码
复制代码 代码如下:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using AspNet.service;
namespace AspNet
{
public partial class Login : System.Web.UI.Page
{
//测试用 没页2条数据
public int pageSize = 2;
public int pageCount;
public LoginLogService logService = new LoginLogService();
protected void Page_Load(object sender, EventArgs e)
{
AjaxPro.Utility.RegisterTypeForAjax(typeof(Login));
if (!IsPostBack)
{
pageCount = logService.PageCount(pageSize);
}
}
//AjaxPro具体使用方法可以网上例子很多
[AjaxPro.AjaxMethod]
public DataTable FindDate(int currentPage)
{
return logService.FindDate(pageSize, currentPage);
}
}
}
5、LoginLogService.cs
复制代码 代码如下:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data;
using System.Data.SqlClient;
namespace AspNet.service
{
public class LoginLogService
{
public DataTable FindDate(int pageSize, int currentPage)
{
string sql = "SELECT LoginID,SwtID,UserName,IP,Address,Address2,LogTime,LogType FROM ( "
+ "SELECT * ,ROW_NUMBER() OVER(ORDER BY LoginID) AS columnNum FROM dbo.LoginLog ) a "
+ "WHERE a.columnNum BETWEEN @begin AND @end";
SqlParameter[] paras = new SqlParameter[]{new SqlParameter("@begin",pageSize * (currentPage-1)+1),
new SqlParameter("@end",pageSize * currentPage)};
DataTable dt = DBHelper.GetDataSet(sql, paras);
return DBHelper.GetDataSet(sql, paras);
}
public int PageCount(int pageSize)
{
string sql = "SELECT COUNT(1) FROM dbo.LoginLog";
int rowCount = int.Parse(DBHelper.GetDataSet(sql).Rows[0][0].ToString());
return rowCount % pageSize == 0 ? rowCount / pageSize : rowCount / pageSize+1;
}
}
}
6、Utils放着DBHelper.cs
复制代码 代码如下:
using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
namespace AspNet
{
public static class DBHelper
{
private static SqlConnection connection;
public static SqlConnection Connection
{
get
{
string connectionString = ConfigurationManager.ConnectionStrings["connSwtLoginLog"].ConnectionString;
if (connection == null)
{
connection = new SqlConnection(connectionString);
connection.Open();
}
else if (connection.State == System.Data.ConnectionState.Closed)
{
connection.Open();
}
else if (connection.State == System.Data.ConnectionState.Broken)
{
connection.Close();
connection.Open();
}
return connection;
}
}
//ExecuteNonQuery方法是用来执行insert、delete、update语句的,返回的是影响的行数
public static int ExecuteCommand(string safeSql)
{
SqlCommand cmd = new SqlCommand(safeSql, Connection);
int result = cmd.ExecuteNonQuery();
return result;
}
public static int ExecuteCommand(string sql, params SqlParameter[] values)
{
SqlCommand cmd = new SqlCommand(sql, Connection);
cmd.Parameters.AddRange(values);
return cmd.ExecuteNonQuery();
}
//ExecuteScalar()返回sql语句执行后的第一行第一列的值,object类型
public static int GetScalar(string safeSql)
{
SqlCommand cmd = new SqlCommand(safeSql, Connection);
int result = Convert.ToInt32(cmd.ExecuteScalar());
return result;
}
public static int GetScalar(string sql, params SqlParameter[] values)
{
SqlCommand cmd = new SqlCommand(sql, Connection);
cmd.Parameters.AddRange(values);
int result = Convert.ToInt32(cmd.ExecuteScalar());
return result;
}
//ExecuteReader()返回一个Datareader对象，对象内容是为与命令匹配的所有行，通常用于读取数据
public static SqlDataReader GetReader(string safeSql)
{
SqlCommand cmd = new SqlCommand(safeSql, Connection);
SqlDataReader reader = cmd.ExecuteReader();
return reader;
}
public static SqlDataReader GetReader(string sql, params SqlParameter[] values)
{
SqlCommand cmd = new SqlCommand(sql, Connection);
cmd.Parameters.AddRange(values);
SqlDataReader reader = cmd.ExecuteReader();
return reader;
}
public static DataTable GetDataSet(string safeSql)
{
connection = Connection;
DataSet ds = new DataSet();
SqlCommand cmd = new SqlCommand(safeSql, Connection);
SqlDataAdapter da = new SqlDataAdapter(cmd);
da.Fill(ds);
cmd.Parameters.Clear();
return ds.Tables[0];
}
public static DataTable GetDataSet(string sql, params SqlParameter[] values)
{
DataSet ds = new DataSet();
SqlCommand cmd = new SqlCommand(sql, Connection);
cmd.Parameters.AddRange(values);
SqlDataAdapter da = new SqlDataAdapter(cmd);
da.Fill(ds);
cmd.Parameters.Clear();
return ds.Tables[0];
}
}
}
复制代码 代码如下:
数据表结构：<pre code_snippet_id="274427" snippet_file_name="blog_20140404_6_6418355" name="code" class="plain">CREATE TABLE [dbo].[LoginLog](
[LoginID] [int] IDENTITY(1,1) NOT NULL,
[SwtID] [int] NULL,
[UserName] [nvarchar](255) COLLATE Chinese_PRC_CI_AS NULL,
[IP] [nvarchar](20) COLLATE Chinese_PRC_CI_AS NULL,
[Address] [nvarchar](255) COLLATE Chinese_PRC_CI_AS NULL,
[Address2] [nvarchar](255) COLLATE Chinese_PRC_CI_AS NULL,
[LogTime] [datetime] NULL,
[LogType] [int] NULL CONSTRAINT [DEFAULT_LoginLog_LogType] DEFAULT ((1)),
CONSTRAINT [PK_LoginLog_LoginID] PRIMARY KEY CLUSTERED
(
[LoginID] ASC
)WITH (PAD_INDEX = OFF, IGNORE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]</pre>
<pre></pre>
<pre code_snippet_id="274427" snippet_file_name="blog_20140404_6_6418355" name="code" class="csharp"><pre code_snippet_id="274427" snippet_file_name="blog_20140404_6_6418355" name="code" class="sql"><pre code_snippet_id="274427" snippet_file_name="blog_20140404_6_6418355"></pre>
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