清除Cookie、获取指定Cookie的值、添加一个Cookie(24小时过期)、添加一个Cookie

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public class CookieHelper

{

///<summary>

  ///清除指定Cookie

  ///</summary>

  ///<param name="cookiename">cookiename</param>

  public static void ClearCookie(string cookiename)

  {

    HttpCookie cookie=HttpContext.Current.Request.Cookies[cookiename];

    if(cookie!=null)

    {

      cookie.Expires=DateTime.Now.AddYears(-5);

      HttpContext.Current.Response.Cookies.Add(cookie);

    }

  }

  

///<summary>

  ///获取指定Cookie值

  ///</summary>

  ///<param name="cookiename">cookiename</param>

  ///<return></return>

  public static string GetCookieValue(string cookiename)

  {

    HttpCookie cookie=HttpContext.Current.Request.Cookies[cookiename];

    string str=String.Empty;

    if(cookie!=null)

    {

     str=cookie.Value; 

     }

    return str;

  }

  

  ///<summary>

  ///添加一个Cookie(24小时过期)

  ///</summary>

  ///<param name="cookiename">cookiename</param>

  ///<param name="cookievalue">cookievalue</param>

  public  static void SetCookie(string cookiename,string cookievalue)

  {

    SetCookie(cookiename,cookievalue,DateTime.Now.AddDays(1.0));

  }

  

///<summary>

  ///添加一个Cookie

  ///</summary>

  ///<param name="cookiename">cookiename</param>

  ///<param name="cookievalue">cookievalue</param>

  ///<param name="expires">过期时间</param>

  public static void  SetCookie(string cookiename,string cookievalue,DateTime wxpiress)

  {

    HttpCookie cookie =new HttpCookie(cookiename)

      {

        Value=cookievalue,

        Expires=expires

      };

    HttpContext.Current.Response.Cookie.Add(cookie);

  }

}

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