The cookie application in ASP. NET, which corresponds to multiple values

Set cookie

Protected void page_load (Object sender, eventargs e) <br/>{< br/> // declare a reference to an httpcookie <br/> httpcookie cookie = NULL; <br/> // count the number of visits <br/> int COUNT = 0; <br/> // determines whether the access request is a page addition. <br/> If (! Page. ispostback) <br/>{< br/> // read the "userinfo" in the session range, because we store the userinfo type, therefore, we can directly convert this type to <br/> userinfo = session ["userinfo"] As userinfo; <br/> If (userinfo = NULL) <br/> {<br/> response. redirect ("login. aspx "); <br/>}< br/> else if (userinfo. username! = "Jrain" | userinfo. Password! = "1234") <br/>{< br/> response. redirect ("login. aspx "); <br/>}< br/> else <br/> {<br/> // read the cookie named" login "from the client, <br/> cookie = request. cookies ["login"]; <br/> // If the cookie does not exist, the cookie is written for the first time. <br/> If (cookie = NULL) <br/>{< br/> // if the client does not have this cookie, We need to instantiate the cookie named login first, <br/> cookie = new httpcookie ("login"); <br/> // Add the number of visits <br/> count ++; </P> <p> // note that only values of the string type can be added to a cookie </P> <p> // set the cookie value. If there are multiple values We use cookies. values ["loginname"] method <br/> cookie. values ["loginname"] = userinfo. username; <br/> cookie. values ["datetime"] = datetime. now. tostring (); <br/> cookie. values ["count"] = count. tostring (); </P> <p>/* set the cookie expiration time. Note: <br/> to save data to the hard disk, you must set the cookie expiration time. Otherwise, the cookie will only be stored in the memory. <br/> expires attribute, which sets the cookie expiration date and time. If the cookie validity period is not set (the default setting), <br/> You can also create a cookie, but it will not be saved to the user's hard disk, but will become part of the user's session information, <br/> when the browser is closed or the session times out, the cookie will disappear. This cookie is called a non-permanent cookie. <Br/> the cookie for storing sessionid is such a cookie, which is not stored on the hard disk and only exists in the memory. */<Br/> // cookie. the expires value is an enumeration of datetime <br/> cookie. expires = datetime. now. adddays (30); <br/> // write the cookie to the client <br/> response. cookies. add (cookie ); <br/>}< br/> else // when the client has a cookie currently searched <br/> {<br/> // number of visits read <br/> COUNT = int. parse (cookie. values ["count"]. tostring (); <br/> // times plus <br/> count ++; <br/> // read the logon name <br/> cookie. values ["loginname"] = userinfo. username; <br/> // read logon time <br/> cookie. values ["da Tetime "] = datetime. now. tostring (); <br/> cookie. values ["count"] = count. tostring (); <br/> cookie. expires = datetime. now. adddays (30); <br/> // update the current cookie value in the cookie set <br/> response. cookies. set (cookie); </P> <p >}</P> <p> response. write (userinfo. username + "welcome"); <br/>}</P> <p> This. lblleavetime. TEXT = datetime. now. tostring (); <br/>}</P> <p> // obtain the cookie value of the customer named "login" <br/> If (request. cookies ["L Ogin "]! = NULL) <br/>{< br/> // multiple values <br/> string loginname = request. cookies ["login"] ["loginname"]. tostring (); <br/> If (loginname! = NULL) <br/>{< br/> response. write ("username" + loginname); </P> <p >}</P> <p> string time = request. cookies ["login"] ["datetime"]. tostring (); <br/> If (time! = NULL) <br/>{< br/> response. write ("Upload time" + time); <br/>}</P> <p> string COUNT = request. cookies ["login"] ["count"]. tostring (); <br/> If (count! = NULL) <br/>{< br/> response. write ("access times" + count); <br/>}</P> <p> protected void page_load (Object sender, eventargs E) <br/>{< br/> // declare a reference to an httpcookie <br/> httpcookie cookie = NULL; <br/> // count the number of visits <br/> int COUNT = 0; <br/> // determines whether the access request is a page addition. <br/> If (! Page. ispostback) <br/>{< br/> // read the "userinfo" in the session range, because we store the userinfo type, therefore, we can directly convert this type to <br/> userinfo = session ["userinfo"] As userinfo; <br/> If (userinfo = NULL) <br/> {<br/> response. redirect ("login. aspx "); <br/>}< br/> else if (userinfo. username! = "Jrain" | userinfo. Password! = "1234") <br/>{< br/> response. redirect ("login. aspx "); <br/>}< br/> else <br/> {<br/> // read the cookie named" login "from the client, <br/> cookie = request. cookies ["login"]; <br/> // If the cookie does not exist, the cookie is written for the first time. <br/> If (cookie = NULL) <br/>{< br/> // if the client does not have this cookie, We need to instantiate this name first.

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