/// <summary>
/// 以 <paramref name="expires"/> 设置的过期时间，存储键和值到 Cookie。
/// </summary>
/// <param name="accessor"></param>
/// <param name="key">要存储的 Cookie 键。</param>
/// <param name="value">要存储的 Cookie 值。</param>
/// <param name="expires">过期时间，为 null 表示不过期。</param>
public static void SaveCookie(this ICookiesAccessor accessor, string key, string value, DateTime?expires)
{
CookieOptions options = new CookieOptions();
options.Expires = expires;
accessor.SaveCookie(key, value, options);
}
/// <summary>
/// 存储键和值到 Cookie。
/// </summary>
/// <param name="accessor"></param>
/// <param name="key">要存储的 Cookie 键。</param>
/// <param name="value">要存储的 Cookie 值。</param>
public static void SaveCookie(this ICookiesAccessor accessor, string key, string value)
{
accessor.SaveCookie(key, value, (CookieOptions)null);
}