C # (Cookie) basic operations,

C # (Cookie) basic operations,

Create a new CookieHelper in Common and call it globally.

Using System; using System. collections. generic; using System. linq; using System. text; using System. threading. tasks; using System. web; namespace Common {public class CookieHelper {/// <summary> // set the cookie // </summary> /// <param name = "cookieName"> cookie name </ param> /// <param name = "cookieValue"> cookie value </param> /// <param name = "domain"> scope, if it is null, no write scope </param> public static void SetCookie (String cookieNam E, String cookieValue, string domain) {if (String. IsNullOrEmpty (cookieName) | String. IsNullOrEmpty (cookieValue) return; if (HttpContext. Current! = Null) {HttpCookie cookie = new HttpCookie (cookieName, cookieValue); if (domain. length> 0) {cookie. domain = domain;} cookie. httpOnly = true; HttpContext. current. response. cookies. add (cookie );}} /// <summary> /// set cookie /// </summary> /// <param name = "cookieName"> cookie name </param> /// <param name = "cookieValue"> cookie value </param> // <param name = "domain"> scope, if it is null, no scope is written. </param> // <param name = "day "> Validity period </param> public static void SetCookie (String cookieName, String cookieValue, string domain, int day) {if (String. isNullOrEmpty (cookieName) | String. isNullOrEmpty (cookieValue) return; if (HttpContext. current! = Null) {HttpCookie cookie = new HttpCookie (cookieName, cookieValue); if (domain. length> 0) {cookie. domain = domain;} cookie. httpOnly = true; cookie. expires = DateTime. now. addDays (day); HttpContext. current. response. cookies. add (cookie );}} /// <summary> /// set cookie expiration /// </summary> /// <param name = "cookieName"> name of the cookie to be expired </param> public static void ExpireCookie (String cookieName) {if (Strin G. IsNullOrEmpty (cookieName) return; if (HttpContext. Current! = Null) {HttpCookie cookie = new HttpCookie (cookieName, string. empty); cookie. httpOnly = true; cookie. expires = DateTime. now. addYears (-5); HttpContext. current. response. cookies. add (cookie );}} /// <summary> /// obtain the value of the corresponding Cookie name /// </summary> /// <param name = "cookieName"> Cookie name </param> /// <returns> </returns> public static string GetCookie (string cookieName) {if (string. isNullOrEmpty (cookieName) return string. empty; if (System. web. httpContext. current = null) return string. empty; if (System. web. httpContext. current. request. cookies [cookieName] = null) return string. empty; else return System. web. httpContext. current. request. cookies [cookieName]. value ;} /// <summary> /// determine whether the corresponding Cookie exists // </summary> /// <param name = "cookieName"> Cookie name </param> /// <returns> </returns> public static bool ExistCookie (string cookieName) {if (string. isNullOrEmpty (cookieName) | System. web. httpContext. current = null) return false; if (System. web. httpContext. current. request. cookies [cookieName] = null) return false; if (System. web. httpContext. current. request. cookies [cookieName]. value = null) return false; return (System. web. httpContext. current. request. cookies [cookieName]. value. length> 0 );}}}