C#用AJAX验证用户登陆使用三层结构

客官°小女子只卖身不卖艺 2021-11-16 07:34 230阅读 0赞

DAL:

![None.gif][] using  System;  
![None.gif][] using  System.Collections.Generic;  
![None.gif][] using  System.Configuration;  
![None.gif][] using  System.Linq;  
![None.gif][] using  System.Text;  
![None.gif][] using  System.Data;  
![None.gif][] using  System.Data.Common;  
![None.gif][] using  System.Data.SqlClient;  
![None.gif][] using  System.Xml;  
![None.gif][] using  System.Xml.Xsl;  
![None.gif][] using  System.Xml.XPath;  
![None.gif][] namespace  DAL  
![ExpandedBlockStart.gif][]![ContractedBlock.gif][] ![dot.gif][] \{  
![InBlock.gif][]    public static class DBHelper  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]    ![dot.gif][]\{  
![InBlock.gif][]          
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]        /\*\*//// <summary>  
![InBlock.gif][]        /// 创建DbCommand的方法  
![InBlock.gif][]        /// </summary>  
![ExpandedSubBlockEnd.gif][]        /// <returns></returns>  
![InBlock.gif][]        public static DbCommand CreateCommand()  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]        ![dot.gif][]\{  
![InBlock.gif][]            string connectionString = ConfigurationManager.AppSettings\["connString"\];  
![InBlock.gif][]            string providerName = ConfigurationManager.AppSettings\["provName"\];  
![InBlock.gif][]            DbProviderFactory factory = DbProviderFactories.GetFactory(providerName);  
![InBlock.gif][]            DbConnection conn = factory.CreateConnection();  
![InBlock.gif][]            conn.ConnectionString = connectionString;  
![InBlock.gif][]            DbCommand cmd = conn.CreateCommand();  
![InBlock.gif][]            return cmd;  
![ExpandedSubBlockEnd.gif][]        \}  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]        /\*\*//// <summary>  
![InBlock.gif][]        /// 返回DataTabale的方法，第一重重载  
![InBlock.gif][]        /// </summary>  
![InBlock.gif][]        /// <param name="sql"></param>  
![ExpandedSubBlockEnd.gif][]        /// <returns></returns>  
![InBlock.gif][]        public static DataTable ExecuteCommand(string sql)  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]        ![dot.gif][]\{  
![InBlock.gif][]            DataTable table = new DataTable();  
![InBlock.gif][]            DbDataReader reader = null;  
![InBlock.gif][]            DbCommand cmd = DBHelper.CreateCommand();  
![InBlock.gif][]            cmd.CommandText = sql;  
![InBlock.gif][]            try  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]            ![dot.gif][]\{  
![InBlock.gif][]                  
![InBlock.gif][]                cmd.Connection.Open();  
![InBlock.gif][]                reader = cmd.ExecuteReader();  
![InBlock.gif][]                table.Load(reader);  
![ExpandedSubBlockEnd.gif][]            \}  
![InBlock.gif][]            catch (Exception ex)  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]            ![dot.gif][]\{  
![InBlock.gif][]  
![InBlock.gif][]                throw ex;  
![ExpandedSubBlockEnd.gif][]            \}  
![InBlock.gif][]            finally  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]            ![dot.gif][]\{  
![InBlock.gif][]                reader.Close();  
![InBlock.gif][]                cmd.Connection.Close();  
![ExpandedSubBlockEnd.gif][]            \}  
![InBlock.gif][]            return table;  
![ExpandedSubBlockEnd.gif][]        \}  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]        /\*\*//// <summary>  
![InBlock.gif][]        /// 返回DataTabale的方法，第二重重载，可执行存储过程  
![InBlock.gif][]        /// </summary>  
![InBlock.gif][]        /// <param name="sql"></param>  
![InBlock.gif][]        /// <param name="values"></param>  
![ExpandedSubBlockEnd.gif][]        /// <returns></returns>  
![InBlock.gif][]        public static DataTable ExecuteCommand(string sql, params DbParameter\[\] values)  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]        ![dot.gif][]\{  
![InBlock.gif][]            DataTable table = new DataTable();  
![InBlock.gif][]            DbDataReader reader = null;  
![InBlock.gif][]            DbCommand cmd = DBHelper.CreateCommand();  
![InBlock.gif][]            cmd.CommandText = sql;  
![InBlock.gif][]            cmd.CommandType = CommandType.StoredProcedure;  
![InBlock.gif][]            cmd.Parameters.AddRange(values);  
![InBlock.gif][]            try  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]            ![dot.gif][]\{  
![InBlock.gif][]                cmd.Connection.Open();  
![InBlock.gif][]  
![InBlock.gif][]                reader = cmd.ExecuteReader();  
![InBlock.gif][]                table.Load(reader);  
![InBlock.gif][]  
![ExpandedSubBlockEnd.gif][]            \}  
![InBlock.gif][]            catch (Exception ex)  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]            ![dot.gif][]\{  
![InBlock.gif][]  
![InBlock.gif][]                throw ex;  
![ExpandedSubBlockEnd.gif][]            \}  
![InBlock.gif][]            finally  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]            ![dot.gif][]\{  
![InBlock.gif][]                reader.Close();  
![InBlock.gif][]                cmd.Connection.Close();  
![ExpandedSubBlockEnd.gif][]            \}  
![InBlock.gif][]            return table;  
![ExpandedSubBlockEnd.gif][]        \}  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]        /\*\*//// <summary>  
![InBlock.gif][]        /// 执行修改、删除、添加数据库中表的方法，第一重重载  
![InBlock.gif][]        /// </summary>  
![InBlock.gif][]        /// <param name="sql"></param>  
![ExpandedSubBlockEnd.gif][]        /// <returns></returns>  
![InBlock.gif][]        public static int ExecuteNoQuery(string sql)  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]        ![dot.gif][]\{  
![InBlock.gif][]            int affect = \-1;  
![InBlock.gif][]            DbCommand cmd = DBHelper.CreateCommand();  
![InBlock.gif][]            cmd.CommandText = sql;  
![InBlock.gif][]            try  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]            ![dot.gif][]\{  
![InBlock.gif][]                cmd.Connection.Open();  
![InBlock.gif][]                affect = cmd.ExecuteNonQuery();  
![ExpandedSubBlockEnd.gif][]            \}  
![InBlock.gif][]            catch (Exception ex)  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]            ![dot.gif][]\{  
![InBlock.gif][]                throw ex;  
![ExpandedSubBlockEnd.gif][]            \}  
![InBlock.gif][]            finally  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]            ![dot.gif][]\{  
![InBlock.gif][]                cmd.Connection.Close();  
![ExpandedSubBlockEnd.gif][]            \}  
![InBlock.gif][]            return affect;  
![InBlock.gif][]  
![ExpandedSubBlockEnd.gif][]        \}  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]        /\*\*//// <summary>  
![InBlock.gif][]        /// 执行修改、删除、添加数据库中表的方法，第二重重载，可执行存储过程  
![InBlock.gif][]        /// </summary>  
![InBlock.gif][]        /// <param name="sql"></param>  
![InBlock.gif][]        /// <param name="values"></param>  
![ExpandedSubBlockEnd.gif][]        /// <returns></returns>  
![InBlock.gif][]        public static int ExecuteNoQuery(string sql,params DbParameter\[\] values)  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]        ![dot.gif][]\{  
![InBlock.gif][]            int affect = \-1;  
![InBlock.gif][]            DbCommand cmd = DBHelper.CreateCommand();  
![InBlock.gif][]            cmd.CommandText = sql;  
![InBlock.gif][]            cmd.CommandType = CommandType.StoredProcedure;  
![InBlock.gif][]            cmd.Parameters.AddRange(values);  
![InBlock.gif][]            try  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]            ![dot.gif][]\{  
![InBlock.gif][]                cmd.Connection.Open();  
![InBlock.gif][]                affect = cmd.ExecuteNonQuery();  
![ExpandedSubBlockEnd.gif][]            \}  
![InBlock.gif][]            catch (Exception ex)  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]            ![dot.gif][]\{  
![InBlock.gif][]                throw ex;  
![ExpandedSubBlockEnd.gif][]            \}  
![InBlock.gif][]            finally  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]            ![dot.gif][]\{  
![InBlock.gif][]                cmd.Connection.Close();  
![ExpandedSubBlockEnd.gif][]            \}  
![InBlock.gif][]            return affect;  
![InBlock.gif][]  
![ExpandedSubBlockEnd.gif][]        \}  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]        /\*\*//// <summary>  
![InBlock.gif][]        /// 返回数据表的第一行第一列，第一重重载  
![InBlock.gif][]        /// </summary>  
![InBlock.gif][]        /// <param name="sql"></param>  
![ExpandedSubBlockEnd.gif][]        /// <returns></returns>  
![InBlock.gif][]        public static string GetScalar(string sql)  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]        ![dot.gif][]\{  
![InBlock.gif][]            string result = null;  
![InBlock.gif][]            DbCommand cmd = DBHelper.CreateCommand();  
![InBlock.gif][]            cmd.CommandText = sql;  
![InBlock.gif][]            try  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]            ![dot.gif][]\{  
![InBlock.gif][]                cmd.Connection.Open();  
![InBlock.gif][]                result = cmd.ExecuteScalar().ToString();  
![ExpandedSubBlockEnd.gif][]            \}  
![InBlock.gif][]            catch(Exception ex)  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]            ![dot.gif][]\{  
![InBlock.gif][]  
![InBlock.gif][]                result = (string)(cmd.ExecuteScalar());  
![ExpandedSubBlockEnd.gif][]            \}  
![InBlock.gif][]            finally  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]            ![dot.gif][]\{  
![InBlock.gif][]                cmd.Connection.Close();  
![ExpandedSubBlockEnd.gif][]            \}  
![InBlock.gif][]            return result;  
![ExpandedSubBlockEnd.gif][]        \}  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]        /\*\*//// <summary>  
![InBlock.gif][]        /// 返回数据表的第一行第一列，第二重重载，可执行存储过程  
![InBlock.gif][]        /// </summary>  
![InBlock.gif][]        /// <param name="sql"></param>  
![InBlock.gif][]        /// <param name="values"></param>  
![ExpandedSubBlockEnd.gif][]        /// <returns></returns>  
![InBlock.gif][]        public static string GetScalar(string sql, params DbParameter\[\] values)  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]        ![dot.gif][]\{  
![InBlock.gif][]            string result = null;  
![InBlock.gif][]            DbCommand cmd = null;  
![InBlock.gif][]            cmd.CommandText = sql;  
![InBlock.gif][]            cmd.CommandType = CommandType.StoredProcedure;  
![InBlock.gif][]            cmd.Parameters.AddRange(values);  
![InBlock.gif][]            try  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]            ![dot.gif][]\{  
![InBlock.gif][]                cmd = DBHelper.CreateCommand();  
![InBlock.gif][]                cmd.Connection.Open();  
![InBlock.gif][]                result = cmd.ExecuteScalar().ToString();  
![ExpandedSubBlockEnd.gif][]            \}  
![InBlock.gif][]            catch (Exception ex)  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]            ![dot.gif][]\{  
![InBlock.gif][]                result = (string)(cmd.ExecuteScalar());  
![ExpandedSubBlockEnd.gif][]            \}  
![InBlock.gif][]            finally  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]            ![dot.gif][]\{  
![InBlock.gif][]                cmd.Connection.Close();  
![ExpandedSubBlockEnd.gif][]            \}  
![InBlock.gif][]            return result;  
![ExpandedSubBlockEnd.gif][]        \}  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]        /\*\*//// <summary>  
![InBlock.gif][]        /// 把数据转换成XML形式输出，第一重重载  
![InBlock.gif][]        /// </summary>  
![InBlock.gif][]        /// <param name="sql"></param>  
![ExpandedSubBlockEnd.gif][]        /// <returns></returns>  
![InBlock.gif][]        public static string GetXmlReaderString(string sql)  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]        ![dot.gif][]\{  
![InBlock.gif][]            StringBuilder xmlString = new StringBuilder();  
![InBlock.gif][]            SqlCommand sqlcmd = (SqlCommand)(DBHelper.CreateCommand());  
![InBlock.gif][]            sqlcmd.CommandText = sql;  
![InBlock.gif][]            try  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]            ![dot.gif][]\{  
![InBlock.gif][]                sqlcmd.Connection.Open();  
![InBlock.gif][]                XmlReader reader = sqlcmd.ExecuteXmlReader();  
![InBlock.gif][]                reader.Read();  
![InBlock.gif][]                xmlString.Append("<root>");  
![InBlock.gif][]                while (!reader.EOF)  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]                ![dot.gif][]\{  
![InBlock.gif][]                    xmlString.Append(reader.ReadOuterXml());  
![ExpandedSubBlockEnd.gif][]                \}  
![InBlock.gif][]                xmlString.Append("</root>");  
![ExpandedSubBlockEnd.gif][]            \}  
![InBlock.gif][]            catch (Exception ex)  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]            ![dot.gif][]\{  
![InBlock.gif][]                throw ex;  
![ExpandedSubBlockEnd.gif][]            \}  
![InBlock.gif][]            finally  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]            ![dot.gif][]\{  
![InBlock.gif][]                sqlcmd.Connection.Close();  
![ExpandedSubBlockEnd.gif][]            \}  
![InBlock.gif][]            return xmlString.ToString();  
![ExpandedSubBlockEnd.gif][]        \}  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]        /\*\*//// <summary>  
![InBlock.gif][]        /// 把数据转换成XML形式输出，第二重重载，可执行存储过程  
![InBlock.gif][]        /// </summary>  
![InBlock.gif][]        /// <param name="sql"></param>  
![InBlock.gif][]        /// <param name="values"></param>  
![ExpandedSubBlockEnd.gif][]        /// <returns></returns>  
![InBlock.gif][]        public static string GetXmlReaderString(string sql,params SqlParameter\[\] values)  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]        ![dot.gif][]\{  
![InBlock.gif][]            StringBuilder xmlString = new StringBuilder();  
![InBlock.gif][]            SqlCommand sqlcmd = (SqlCommand)(DBHelper.CreateCommand());  
![InBlock.gif][]            sqlcmd.CommandText = sql;  
![InBlock.gif][]            sqlcmd.CommandType = CommandType.StoredProcedure;  
![InBlock.gif][]            sqlcmd.Parameters.AddRange(values);      
![InBlock.gif][]            try  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]            ![dot.gif][]\{  
![InBlock.gif][]                sqlcmd.Connection.Open();  
![InBlock.gif][]                XmlReader reader = sqlcmd.ExecuteXmlReader();  
![InBlock.gif][]                reader.Read();  
![InBlock.gif][]                xmlString.Append("<root>");  
![InBlock.gif][]                while (!reader.EOF)  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]                ![dot.gif][]\{  
![InBlock.gif][]                    xmlString.Append(reader.ReadOuterXml());  
![ExpandedSubBlockEnd.gif][]                \}  
![InBlock.gif][]                xmlString.Append("</root>");  
![ExpandedSubBlockEnd.gif][]            \}  
![InBlock.gif][]            catch (Exception ex)  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]            ![dot.gif][]\{  
![InBlock.gif][]                throw ex;  
![ExpandedSubBlockEnd.gif][]            \}  
![InBlock.gif][]            finally  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]            ![dot.gif][]\{  
![InBlock.gif][]                sqlcmd.Connection.Close();  
![ExpandedSubBlockEnd.gif][]            \}  
![InBlock.gif][]            return xmlString.ToString();  
![ExpandedSubBlockEnd.gif][]        \}  
![InBlock.gif][]  
![ExpandedSubBlockEnd.gif][]    \}  
![ExpandedBlockEnd.gif][]\}   
![None.gif][]

Model:

![None.gif][] using  System;  
![None.gif][] using  System.Collections.Generic;  
![None.gif][] using  System.Linq;  
![None.gif][] using  System.Text;  
![None.gif][]  
![None.gif][] namespace  Model  
![ExpandedBlockStart.gif][]![ContractedBlock.gif][] ![dot.gif][] \{  
![InBlock.gif][]    public class User  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]    ![dot.gif][]\{  
![InBlock.gif][]        string username;  
![InBlock.gif][]        string password;  
![InBlock.gif][]        public string Username  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]        ![dot.gif][]\{  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]            get ![dot.gif][]\{ return this.username; \}  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]            set ![dot.gif][]\{ this.username = value; \}  
![ExpandedSubBlockEnd.gif][]        \}  
![InBlock.gif][]        public string Password  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]        ![dot.gif][]\{  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]            get ![dot.gif][]\{ return this.password; \}  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]            set ![dot.gif][]\{ this.password = value; \}  
![InBlock.gif][]  
![ExpandedSubBlockEnd.gif][]        \}  
![ExpandedSubBlockEnd.gif][]    \}  
![ExpandedBlockEnd.gif][]\}

BLL:

![None.gif][] using  System;  
![None.gif][] using  System.Collections.Generic;  
![None.gif][] using  System.Linq;  
![None.gif][] using  System.Text;  
![None.gif][] using  Model;  
![None.gif][] using  DAL;  
![None.gif][] using  System.Data;  
![None.gif][] namespace  BLL  
![ExpandedBlockStart.gif][]![ContractedBlock.gif][] ![dot.gif][] \{  
![InBlock.gif][]    public class BLLCheckUser  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]    ![dot.gif][]\{  
![InBlock.gif][]        public static string Check(User user)  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]        ![dot.gif][]\{  
![InBlock.gif][]            string sql = "select \* from tb\_User where UserId='" \+ user.Username \+ "' and Password='" \+ user.Password \+ "'";  
![InBlock.gif][]            DataTable table = DBHelper.ExecuteCommand(sql);  
![InBlock.gif][]            if (table.Rows.Count > 0)  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]            ![dot.gif][]\{  
![InBlock.gif][]                if(table.Rows\[0\]\["UserId"\].ToString()!="")  
![InBlock.gif][]                return "true";  
![ExpandedSubBlockEnd.gif][]            \}  
![InBlock.gif][]            return "false";  
![ExpandedSubBlockEnd.gif][]        \}  
![ExpandedSubBlockEnd.gif][]    \}  
![ExpandedBlockEnd.gif][]\}

页面：

![ExpandedBlockStart.gif][] ![ContractedBlock.gif][] <% ![dot.gif][] @ Page Language="C\#" AutoEventWireup="true" CodeFile="Login.aspx.cs" Inherits="Login"  %>   
![None.gif][]  
![None.gif][] <! DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" >   
![None.gif][]  
![None.gif][] < html  xmlns ="http://www.w3.org/1999/xhtml" >   
![None.gif][] < head  runat ="server" >   
![None.gif][]     < title ></ title >   
![ExpandedBlockStart.gif][]![ContractedBlock.gif][] < style  type ="text/css" > ![dot.gif][]   
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]body\{ ![dot.gif][]\}\{   
![InBlock.gif][]    text-align: center;  
![InBlock.gif][]    font-size: 12px;  
![InBlock.gif][]    color:\#666;  
![InBlock.gif][]    font-family: font-family: Arial, Helvetica, sans-serif;  
![ExpandedSubBlockEnd.gif][]\}  
![InBlock.gif][]table  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]\{ ![dot.gif][]\}\{   
![InBlock.gif][]    margin-top: 160px;  
![InBlock.gif][]    padding-top: 30px;  
![InBlock.gif][]    padding-bottom: 30px;  
![InBlock.gif][]    border: solid 2px \#333;  
![InBlock.gif][]    background: \#fafcfd;  
![InBlock.gif][]      
![ExpandedSubBlockEnd.gif][]\}  
![InBlock.gif][]h1  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]\{ ![dot.gif][]\}\{   
![InBlock.gif][]    width: 200px;  
![InBlock.gif][]    font-size:24px;  
![InBlock.gif][]    text-align: center;  
![InBlock.gif][]    margin: 0;  
![InBlock.gif][]    padding: 0;  
![InBlock.gif][]    margin-left: 100px;  
![InBlock.gif][]      
![ExpandedSubBlockEnd.gif][]\}  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]td\{ ![dot.gif][]\}\{   
![InBlock.gif][]    width: 200px;  
![InBlock.gif][]    height: 30px;  
![InBlock.gif][]    padding: 6px;  
![ExpandedSubBlockEnd.gif][]\}  
![InBlock.gif][].field  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]\{ ![dot.gif][]\}\{   
![InBlock.gif][]    width: 120px;  
![InBlock.gif][]    border: solid 1px \#ccc;  
![InBlock.gif][]  
![ExpandedSubBlockEnd.gif][]\}  
![InBlock.gif][].login\_btn  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]\{ ![dot.gif][]\}\{   
![InBlock.gif][]    border: solid 1px \#ccc;  
![InBlock.gif][]    background: \#fafcfd;  
![InBlock.gif][]    text-align:center;  
![InBlock.gif][]    width: 60px;  
![InBlock.gif][]    font-size: 12px;  
![InBlock.gif][]    color: \#666;  
![InBlock.gif][]    margin: 10px;  
![InBlock.gif][]    padding-top:2px;  
![InBlock.gif][]    line-height: 16px;  
![ExpandedSubBlockEnd.gif][]\}  
![ExpandedBlockEnd.gif][]     </ style >   
![None.gif][] </ head >   
![None.gif][] < body >   
![None.gif][]     < form  action ="Office.aspx"  method ="post" >   
![None.gif][]         < table  align ="center" >   
![None.gif][]             < tr >   
![None.gif][]                 < td  colspan ="2" >< h1 > Office办公自动化 </ h1 ></ td >   
![None.gif][]             </ tr >   
![None.gif][]             < tr >   
![None.gif][]                 < td  align ="right" > 用户名： </ td >   
![None.gif][]                 < td  align ="left" >< input  type ="text"  size ="9"  class ="field"  id ="\_name" /></ td >   
![None.gif][]             </ tr >   
![None.gif][]             < tr >   
![None.gif][]                 < td  align ="right" > 密  &nbsp; 码： </ td >   
![None.gif][]                 < td  align ="left" >< input  type ="password"  class ="field"  id ="\_pwd" /></ td >   
![None.gif][]             </ tr >   
![None.gif][]             < tr >   
![None.gif][]                 < td  align ="right" >< input  type ="button"  value ="登陆"  class ="login\_btn"  onclick ="sendTo()" />< input  type ="submit"  id ="submit"  style ="display:none" /></ td >   
![None.gif][]                 < td  align ="left" >< input  type ="reset" value ="取消"  class ="login\_btn" /></ td >   
![None.gif][]             </ tr >            
![None.gif][]         </ table >   
![None.gif][]     </ form >   
![None.gif][] </ body >   
![None.gif][] </ html >

JS脚本：

![None.gif][] function  InitHttpRequest()  
![ExpandedBlockStart.gif][]![ContractedBlock.gif][] ![dot.gif][] \{  
![InBlock.gif][]    var HttpRequest=null;  
![InBlock.gif][]    if(window.ActiveXObject)  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]    ![dot.gif][]\{  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]        try![dot.gif][]\{  
![InBlock.gif][]        HttpRequest=new ActiveXObject("Msxml2.XMLHTTP");  
![ExpandedSubBlockEnd.gif][]        \}  
![InBlock.gif][]        catch(e)  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]        ![dot.gif][]\{  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]            try![dot.gif][]\{  
![InBlock.gif][]                HttpRequest=new ActiveXObject("Microsofr.XMLHTTP");  
![ExpandedSubBlockEnd.gif][]            \}  
![InBlock.gif][]            catch(e)  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]            ![dot.gif][]\{  
![ExpandedSubBlockEnd.gif][]            \}  
![ExpandedSubBlockEnd.gif][]        \}  
![ExpandedSubBlockEnd.gif][]    \}  
![InBlock.gif][]    else if(window.XMLHttpRequest)  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]    ![dot.gif][]\{  
![InBlock.gif][]        HttpRequest = new XMLHttpRequest();  
![ExpandedSubBlockEnd.gif][]    \}  
![InBlock.gif][]    return HttpRequest;  
![ExpandedBlockEnd.gif][]\}   
![None.gif][] function  sendRequest(url,data)  
![ExpandedBlockStart.gif][]![ContractedBlock.gif][] ![dot.gif][] \{  
![InBlock.gif][]    var Request = InitHttpRequest();  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]    Request.onreadystatechange = function() ![dot.gif][]\{  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]        if (Request.readyState == 4 && Request.Status == 200) ![dot.gif][]\{  
![InBlock.gif][]            var recieve = Request.responseText;  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]            if (recieve == "true") ![dot.gif][]\{  
![InBlock.gif][]                document.getElementById("submit").click();  
![InBlock.gif][]                //alert("验证通过！");  
![ExpandedSubBlockEnd.gif][]            \}  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]            else ![dot.gif][]\{  
![InBlock.gif][]                alert("用户名或密码错误！");  
![ExpandedSubBlockEnd.gif][]            \}  
![ExpandedSubBlockEnd.gif][]        \}  
![ExpandedSubBlockEnd.gif][]    \}  
![InBlock.gif][]    Request.open("POST", url, false);  
![InBlock.gif][]    Request.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");  
![InBlock.gif][]    Request.send(data);  
![ExpandedBlockEnd.gif][]\}   
![None.gif][] function  sendTo()  
![ExpandedBlockStart.gif][]![ContractedBlock.gif][] ![dot.gif][] \{  
![InBlock.gif][]    var url = "Ajax/CheckUser.aspx";  
![InBlock.gif][]    var post\_str = "\_name=" \+ document.getElementById("\_name").value \+ "&\_pwd=" \+ document.getElementById("\_pwd").value;//构造POST参数  
![InBlock.gif][]    sendRequest(url,post\_str);  
![ExpandedBlockEnd.gif][]\}

异步调用页面：

![None.gif][] using  System;  
![None.gif][] using  System.Collections.Generic;  
![None.gif][] using  System.Linq;  
![None.gif][] using  System.Web;  
![None.gif][] using  System.Web.UI;  
![None.gif][] using  System.Web.UI.WebControls;  
![None.gif][] using  Model;  
![None.gif][] using  BLL;  
![None.gif][] public   partial   class  AJAX\_CheckUser : System.Web.UI.Page  
![ExpandedBlockStart.gif][]![ContractedBlock.gif][] ![dot.gif][] \{  
![InBlock.gif][]    protected void Page\_Load(object sender, EventArgs e)  
![ExpandedSubBlockStart.gif][]![ContractedSubBlock.gif][]    ![dot.gif][]\{  
![InBlock.gif][]        string username = Request.Params\["\_name"\];  
![InBlock.gif][]        string password = Request.Params\["\_pwd"\];  
![InBlock.gif][]        User user = new User();  
![InBlock.gif][]        user.Username = username;  
![InBlock.gif][]        user.Password = password;  
![InBlock.gif][]        string check = BLLCheckUser.Check(user);  
![InBlock.gif][]        Response.Write(check);  
![ExpandedSubBlockEnd.gif][]    \}  
![ExpandedBlockEnd.gif][]\}

转载于:https://www.cnblogs.com/psunny/archive/2009/07/06/1517394.html

[None.gif]: /images/20211116/b9a8c530080d46e281e222709713eaa8.png
[ExpandedBlockStart.gif]: https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif
[ContractedBlock.gif]: https://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif
[dot.gif]: /images/20211116/0baff3f439e94e8d94a3495fe3834337.png
[InBlock.gif]: /images/20211116/506e716e8e1a440bb0c93e68d2a47b52.png
[ExpandedSubBlockStart.gif]: https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif
[ContractedSubBlock.gif]: /images/20211116/35dc70a68e44452bae2b5d341b4a6946.png
[ExpandedSubBlockEnd.gif]: /images/20211116/771d3df9bdbe42029a936412978be2f7.png
[ExpandedBlockEnd.gif]: /images/20211116/76d8ec7af338419786340e264d7f28b0.png