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ASP. NET limits repeated User Logon

Source: Internet
Author: User
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This method records the session ID and logon time when a user logs on. Then write an XML file. The name of the user name indicates the time when the content is written to the user. After logon, each page compares the written files with the session logon time every 20 seconds. If it is correct, you do not need to worry about it. If it is incorrect, it is kicked out. Because the written file will not be updated if it is not logged on with the same user name.

CodeAllows you to log on to a single logon node for unlimited logon times. You can implement it with a slight modification.

Login Page

<% @ Page Language = "C #" autoeventwireup = "true" codefile = "login. aspx. cs" inherits = "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> No title page </title>

</Head>

<Body>

<Form ID = "form1" runat = "server">

<Div>

& Nbsp; <div>

<Asp: textbox id = "txtuser" runat = "server"> </ASP: textbox>

<Asp: button id = "button1" runat = "server" onClick = "button#click" text = "login"/> <br/>

</Div>

</Div>

</Form>

</Body>

</Html>

Login code

Using system;

Using system. DaTa;

Using system. configuration;

Using system. collections;

Using system. Web;

Using system. Web. Security;

Using system. Web. UI;

Using system. Web. UI. webcontrols;

Using system. Web. UI. webcontrols. webparts;

Using system. Web. UI. htmlcontrols;

Public partial class login: system. Web. UI. Page

{

Protected void page_load (Object sender, eventargs E)

{

}

Protected void button#click (Object sender, eventargs E)

{

String struserid = txtuser. text;

String times = datetime. Now. tostring ("yyyymmddhhmmss ");

String body = coursexmlfileheader + "<usertime>" + times + "</usertime> </newdataset> ";

String coursefilepath = server. mappath (".") + "file: // userlist //" + struserid + ". xml ";

If (! System. Io. file. exists (coursefilepath ))

{

System. Io. filestream newtext = system. Io. file. Create (coursefilepath );

Newtext. Close ();

Session ["session_usertime"] = times;

Session ["session_username"] = struserid;

}

Else

{

System. Io. file. Delete (coursefilepath );

System. Io. filestream newtext = system. Io. file. Create (coursefilepath );

Newtext. Close ();

Session ["session_usertime"] = times;

Session ["session_username"] = struserid;

}

System. Io. streamwriter Sw = new system. Io. streamwriter (coursefilepath, true );

Body = body. Replace ("\'","\"");

Sw. writeline (body );

Sw. Close ();

Response. Redirect ("default. aspx ");

}

Public String coursexmlfileheader = @ "<? XML version = '1. 0' standalone = 'Yes'?> <Newdataset> ";

}

Default Page

<% @ Page Language = "C #" autoeventwireup = "true" codefile = "default. aspx. cs" inherits = "_ default" %>

<! 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 id = "head1" runat = "server">

<Title> </title>

</Head>

<Body>

<Form ID = "form1" runat = "server">

<Asp: gridview id = "datalist1" runat = "server">

</ASP: gridview>

</Form>

</Body>

</Html>

<SCRIPT type = "text/javasOther ">

VaR x = 0;

Function myrefresh ()

{

Xrequest ();

VaR result = "";

XMLHTTP. Open ("Post", "test. aspx", false );

XMLHTTP. Send ("");

Result = XMLHTTP. responsetext;

If (result! = "OK ")

{

Alert ("sorry, your account is logged on elsewhere ");

Location. href = 'logost. aspx ';

}

X ++;

If (x <20)

{

SetTimeout ("myrefresh ()", 1000 );

}

}

Myrefresh ();

VaR XMLHTTP;

Function xrequest (){

If (window. XMLHttpRequest ){

XMLHTTP = new XMLHttpRequest (); // Firefox browser.

}

Else if (window. activexobject ){

XMLHTTP = new activexobject ("msxml2.xmlhttp"); // IE browser.

If (! XMLHTTP) {XMLHTTP = new activexobject ("Microsoft. XMLHTTP ");}

}

}

</SCRIPT>

Code

Using system;

Using system. DaTa;

Using system. configuration;

Using system. collections;

Using system. Web;

Using system. Web. Security;

Using system. Web. UI;

Using system. Web. UI. webcontrols;

Using system. Web. UI. webcontrols. webparts;

Using system. Web. UI. htmlcontrols;

Using system. IO;

Public partial class _ default: system. Web. UI. Page

{

Protected void page_load (Object sender, eventargs E)

{

Directoryinfo di = new directoryinfo (server. mappath (".") + "file: // userlist //");

Filesysteminfo [] Dis = Di. getfilesysteminfos ();

If (DIS. Length <1)

{

Response. Write ("<SCRIPT> alert (\" the directory is empty \ "); </SCRIPT> ");

}

Else

{

Foreach (filesysteminfo fitemp in DIS)

{

Response. Write (fitemp. Name + "<br> ");

}

}

}

}

The test. ASPX page is used to check whether the page is topped. You only need to write the code.

Using system;

Using system. DaTa;

Using system. configuration;

Using system. collections;

Using system. Web;

Using system. Web. Security;

Using system. Web. UI;

Using system. Web. UI. webcontrols;

Using system. Web. UI. webcontrols. webparts;

Using system. Web. UI. htmlcontrols;

Using system. IO;

Using system. xml;

Public partial class test: system. Web. UI. Page

{

Protected void page_load (Object sender, eventargs E)

{

String times = session ["session_usertime"]. tostring ();

String userid = session ["session_username"]. tostring ();

String coursefilepath = server. mappath (".") + "file: // userlist //" + userid + ". xml ";

If (times. Equals (readxmlreturnnode (coursefilepath, "usertime ")))

{

This. response. Write ("OK ");

This. response. End ();

}

Else

{

This. response. Write ("no ");

This. response. End ();

}

}

Public static string readxmlreturnnode (string xmlpath, string node)

{

Xmldocument docxml = new xmldocument ();

Docxml. Load (@ xmlpath );

Xmlnodelist xn = docxml. getelementsbytagname (node );

Return XN. Item (0). innertext. tostring ();

}

}

Exit logost. aspx

Using system;

Using system. DaTa;

Using system. configuration;

Using system. collections;

Using system. Web;

Using system. Web. Security;

Using system. Web. UI;

Using system. Web. UI. webcontrols;

Using system. Web. UI. webcontrols. webparts;

Using system. Web. UI. htmlcontrols;

Public partial class logost: system. Web. UI. Page

{

Protected void page_load (Object sender, eventargs E)

{

Session. Remove ("session_usertime ");

Session. Remove ("session_username ");

Response. Redirect ("login. aspx ");

}

}

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

Related Keywords:
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