C # use of cookies and interaction with javascript cookies

Create:

HttpCookie cookie = new HttpCookie ("regID ");
Cookie. Value = username;
Cookie. Expires = DateTime. Now. AddDays (1 );
Response. Cookies. Add (cookie );

Create a sub-key:

Response. Cookies ["user"] ["userName"] = Server. UrlEncode (" watermelon"); // UrlEncode is used to retrieve data using javascript without garbled characters.

Or:
HttpCookie cookie = new HttpCookie ("user ");
Cookie. Values ["userName"] = "aaa"; // cookie. Values. Add ("userName", "aaa ");
Cookie. Expires = DateTime. Now. AddDays (1 );
Response. Cookies. Add (cookie) // Response. AppendCookie (cookie );

 

 

Eliminate: You cannot delete the COOKIE directly because it is saved on the user's machine after the COOKIE is created, rather than on the server.

Delete all the items as follows:

Private HttpCookie cookie = null;
Private string cookieName = string. Empty;

For (int I = 0; I <Request. Cookies. Count; I ++)
{
CookieName = Request. Cookies [I]. Name;
Cookie = new HttpCookie (cookieName );
Cookie. Expires = DateTime. Now. AddDays (-1 );
Response. Cookies. Add (cookie );
}

Delete subkeys:
HttpCookie;
Cookie = Request. Cookies ["userInfo"];
Cookie. Values. Remove ("userName ");
Cookie. Expires = DateTime. Now. AddDays (1 );
Response. Cookies. Add (cookie );

 

 

 

 

 

Use javascript to obtain the cookie:

Function get_head_cookie (c_name)
{

If (document. cookie. length> 0)
{
C_start = document. cookie. indexOf (c_name + "= ");
If (c_start! =-1)
{
C_start = c_start + c_name.length + 1;
C_end = document. cookie. indexOf (";", c_start );
If (c_end =-1)
{
C_end = document. cookie. length;
}
Return decodeURIComponent (myreplace_head (document. cookie. substring (c_start, c_end), '+ ',''));
}
}
Return null;
}

Var email = get_head_cookie ('regid ');
Var nickname = get_head_cookie ('username ');

If (email! = ''& Email! = Null & nickname! = ''& Nickname! = Null)
{
// Cookie
}
Else
{
// When the cookie is empty

}