/*http://evlon.cnblogs.com/archive/2006/03/20/354191.html
*/
我在们使用ASP.Net开发WEB网站时，有的时候是不让同一个用户名在同一时间进行多次登陆的。
为了不影响原来的整个网站，我选择使用了HttpModuler来实现。
先让所有的Page从自己的Page类：BasePage类继承，并实现 ISigleLogin接口。相关代码如下：
public
interface
ISingleLogin
{
string SigleUserLoginId { get; }
void SigleUserLogout();
}
public
class
BasePage : System.Web.UI.Page , BNet.Web.Modulers.ISingleLogin
{
public BasePage()
{
//
// TODO: 在此处添加构造函数逻辑
//
}
protected override void OnLoad(EventArgs e)
{
base.OnLoad(e);
if (Session["UserId"] == null)
{
Response.Write("你还没有登陆");
Response.Redirect("login.aspx");
}
}
ISingleLogin 成员
}
<
system
.web
>
<
httpModules
>
<
add
name
="SingleLogin"
type
="BNet.Web.Modulers.SingleLoginModuler"
/>
</
httpModules
>
</
system.web
>
相关的SigleLoginModuler代码如下：
using
System;
using
System.Collections.Generic;
using
System.Data;
using
System.Configuration;
using
System.Web;
using
System.Web.UI;
namespace
BNet.Web.Modulers
{
/// <summary>
/// SingleLoginModuler 的摘要说明
/// </summary>
public class SingleLoginModuler : System.Web.IHttpModule
{
const string sigle_login_userid = "evlon_siglelogin_userid";
const string sigle_pre_logout_sessionid = "evlon_sigle_pre_logout_sessionid";
static StringLifeValueDictionary loginedUserIdDictionary = null;
static StringLifeValueDictionary LoginedUserIdDictionary
{
get
{
if (loginedUserIdDictionary == null)
{
loginedUserIdDictionary = new StringLifeValueDictionary();
}
else
{
List<string> listRemove = new List<string>();
StringLifeValueDictionary.Enumerator iter = loginedUserIdDictionary.GetEnumerator();
while (iter.MoveNext())
{
if (iter.Current.Value.life < DateTime.Now)
{
listRemove.Add(iter.Current.Key);
}
}
foreach (string key in listRemove)
{
loginedUserIdDictionary.Remove(key);
}
}
return loginedUserIdDictionary;
}
}
static StringLifeValueDictionary preLogoutSessionIdDictionary = null;
static StringLifeValueDictionary PreLogoutSessionIdDictionary
{
get
{
if (preLogoutSessionIdDictionary == null)
{
preLogoutSessionIdDictionary = new StringLifeValueDictionary();
}
else
{
List<string> listRemove = new List<string>();
StringLifeValueDictionary.Enumerator iter = preLogoutSessionIdDictionary.GetEnumerator();
while (iter.MoveNext())
{
if (iter.Current.Value.life < DateTime.Now)
{
listRemove.Add(iter.Current.Key);
}
}
foreach (string key in listRemove)
{
preLogoutSessionIdDictionary.Remove(key);
}
}
return preLogoutSessionIdDictionary;
}
}
public SingleLoginModuler()
{
//
// TODO: 在此处添加构造函数逻辑
//
}
IHttpModule 成员
}
public class LifeValue
{
public string value;
public DateTime life;
public LifeValue(string value)
{
this.value = value;
this.life = DateTime.Now.AddMinutes(HttpContext.Current.Session.Timeout + 5);
}
}
public class StringLifeValueDictionary : Dictionary<string, LifeValue>
{
}
public interface ISingleLogin
{
string SigleUserLoginId { get; }
void SigleUserLogout();
}
}
*/
我在们使用ASP.Net开发WEB网站时，有的时候是不让同一个用户名在同一时间进行多次登陆的。
为了不影响原来的整个网站，我选择使用了HttpModuler来实现。
先让所有的Page从自己的Page类：BasePage类继承，并实现 ISigleLogin接口。相关代码如下：
public
interface
ISingleLogin
{ string SigleUserLoginId { get; } void SigleUserLogout(); }
public
class
BasePage : System.Web.UI.Page , BNet.Web.Modulers.ISingleLogin
{ public BasePage() { // // TODO: 在此处添加构造函数逻辑 // } protected override void OnLoad(EventArgs e) { base.OnLoad(e); if (Session["UserId"] == null) { Response.Write("你还没有登陆"); Response.Redirect("login.aspx"); } } ISingleLogin 成员}
然后在Web.config中加入HttpModuler：
<
system
.web
>
<
httpModules
>
<
add
name
="SingleLogin"
type
="BNet.Web.Modulers.SingleLoginModuler"
/>
</
httpModules
>
</
system.web
>
using
System;
using
System.Collections.Generic;
using
System.Data;
using
System.Configuration;
using
System.Web;
using
System.Web.UI;
namespace
BNet.Web.Modulers
{ /// <summary> /// SingleLoginModuler 的摘要说明 /// </summary> public class SingleLoginModuler : System.Web.IHttpModule { const string sigle_login_userid = "evlon_siglelogin_userid"; const string sigle_pre_logout_sessionid = "evlon_sigle_pre_logout_sessionid"; static StringLifeValueDictionary loginedUserIdDictionary = null; static StringLifeValueDictionary LoginedUserIdDictionary { get { if (loginedUserIdDictionary == null) { loginedUserIdDictionary = new StringLifeValueDictionary(); } else { List<string> listRemove = new List<string>(); StringLifeValueDictionary.Enumerator iter = loginedUserIdDictionary.GetEnumerator(); while (iter.MoveNext()) { if (iter.Current.Value.life < DateTime.Now) { listRemove.Add(iter.Current.Key); } } foreach (string key in listRemove) { loginedUserIdDictionary.Remove(key); } } return loginedUserIdDictionary; } } static StringLifeValueDictionary preLogoutSessionIdDictionary = null; static StringLifeValueDictionary PreLogoutSessionIdDictionary { get { if (preLogoutSessionIdDictionary == null) { preLogoutSessionIdDictionary = new StringLifeValueDictionary(); } else { List<string> listRemove = new List<string>(); StringLifeValueDictionary.Enumerator iter = preLogoutSessionIdDictionary.GetEnumerator(); while (iter.MoveNext()) { if (iter.Current.Value.life < DateTime.Now) { listRemove.Add(iter.Current.Key); } } foreach (string key in listRemove) { preLogoutSessionIdDictionary.Remove(key); } } return preLogoutSessionIdDictionary; } } public SingleLoginModuler() { // // TODO: 在此处添加构造函数逻辑 // } IHttpModule 成员 } public class LifeValue { public string value; public DateTime life; public LifeValue(string value) { this.value = value; this.life = DateTime.Now.AddMinutes(HttpContext.Current.Session.Timeout + 5); } } public class StringLifeValueDictionary : Dictionary<string, LifeValue> { } public interface ISingleLogin { string SigleUserLoginId { get; } void SigleUserLogout(); }}
本文转自高海东博客园博客，原文链接：http://www.cnblogs.com/ghd258/archive/2006/03/21/354569.html，如需转载请自行联系原作者
