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[转].net cookie版购物车
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#region 添加到购物车AddShoppingCar /// <summary> /// 添加到购物车AddShoppingCar /// </summary> /// <param name="num">数量 如果存在产品 负数是减少 /// 正数是增加 如果不存在 直接增加</param> /// <param name="id">货物ID</param> /// <param name="expires">cookies保存的天数</param> /// <remarks>这里的方法就是把在原有的Cookie基础上判断是否有 /// 这个产品 如果有 在原有数量上增加 没有 就直接增加 如果是负 /// 数 就是减少 如果负数的数量大于等于 /// 原有数量 设置为0 对应后面的读出操作</remarks> public static void AddShoppingCar(string num, string id, int expires) { if (System.Web.HttpContext.Current.Request.Cookies["Products"] != null) { System.Web.HttpCookie cookie; string cookievalue = http://www.mamicode.com/System.Web.HttpContext.Current.Request.Cookies["Products"].Value; if (System.Web.HttpContext.Current.Request.Cookies["Products"].Values[id.ToString()] == null) { cookievalue = cookievalue + "&" + id + "=" + num; } else { int num1 = int.Parse(System.Web.HttpContext.Current.Request.Cookies["Products"].Values[id.ToString()].ToString()) + int.Parse(num); if (num1 > 0) { System.Web.HttpContext.Current.Request.Cookies["Products"].Values[id.ToString()] = num1.ToString(); } else { System.Web.HttpContext.Current.Request.Cookies["Products"].Values[id.ToString()] = "0"; } cookievalue = System.Web.HttpContext.Current.Request.Cookies["Products"].Value; } cookie = new System.Web.HttpCookie("Products", cookievalue); if (expires != 0) { DateTime dt = DateTime.Now; TimeSpan ts = new TimeSpan(expires, 0, 0, 20); cookie.Expires = dt.Add(ts); } System.Web.HttpContext.Current.Response.AppendCookie(cookie); } else { System.Web.HttpCookie newcookie = new HttpCookie("Products"); if (expires != 0) { DateTime dt = DateTime.Now; TimeSpan ts = new TimeSpan(expires, 0, 0, 20); newcookie.Expires = dt.Add(ts); } newcookie.Values[id.ToString()] = num; System.Web.HttpContext.Current.Response.AppendCookie(newcookie); } } #endregion #region 添加到购物车AddShoppingCar /// <summary> /// 添加到购物车AddShoppingCar /// </summary> /// <param name="num">数量 如果存在产品 负数是减少 /// 正数是增加 如果不存在 直接增加</param> /// <param name="dt"> /// 循环读出来的DATATABLE /// </param> /// <param name="id">货物ID</param> /// <param name="expires">cookies保存的天数</param> /// <remarks>这里的方法就是把在原有的Cookie基础上判断是否有 /// 这个产品 如果有 在原有数量上增加 没有 就直接增加 如果是负 /// 数 就是减少 如果负数的数量大于等于 /// 原有数量 设置为0 对应后面的读出操作</remarks> public static void AddShoppingCar(DataTable dt, int expires) { if (System.Web.HttpContext.Current.Request.Cookies["Products"] != null) { System.Web.HttpCookie cookie; string cookievalue = http://www.mamicode.com/System.Web.HttpContext.Current.Request.Cookies["Products"].Value; for (int i = 0; i < dt.Rows.Count; i++) { if (System.Web.HttpContext.Current.Request.Cookies["Products"].Values[dt.Rows[i]["id"].ToString().ToString()] == null) { cookievalue = cookievalue + "&" + dt.Rows[i]["id"].ToString() + "=" + dt.Rows[i]["num"].ToString(); } else { int num1 = int.Parse(System.Web.HttpContext.Current.Request.Cookies["Products"].Values[dt.Rows[i]["id"].ToString().ToString()].ToString()) + int.Parse(dt.Rows[i]["num"].ToString()); if (num1 > 0) { System.Web.HttpContext.Current.Request.Cookies["Products"].Values[dt.Rows[i]["id"].ToString().ToString()] = num1.ToString(); } else { System.Web.HttpContext.Current.Request.Cookies["Products"].Values[dt.Rows[i]["id"].ToString().ToString()] = "0"; } cookievalue = System.Web.HttpContext.Current.Request.Cookies["Products"].Value; } } cookie = new System.Web.HttpCookie("Products", cookievalue); if (expires != 0) { DateTime time1 = DateTime.Now; TimeSpan ts = new TimeSpan(expires, 0, 0, 20); cookie.Expires = time1.Add(ts); } System.Web.HttpContext.Current.Response.AppendCookie(cookie); } else { System.Web.HttpCookie newcookie = new HttpCookie("Products"); if (expires != 0) { DateTime time1 = DateTime.Now; TimeSpan ts = new TimeSpan(expires, 0, 0, 20); newcookie.Expires = time1.Add(ts); } for (int i = 0; i < dt.Rows.Count; i++) { newcookie.Values[dt.Rows[i]["id"].ToString()] = dt.Rows[i]["num"].ToString(); } System.Web.HttpContext.Current.Response.AppendCookie(newcookie); } } #endregion #region 根据ID删除产品RemoveShoppingCar /// <summary> /// 根据ID删除产品RemoveShoppingCar /// </summary> /// <param name="id">产品ID</param> /// <remarks> /// 就是设置商品数量为0 /// 本来增加方法可以实现 /// 但是需要读出来原有数量 /// 所以为了避免繁琐 有此方法 /// </remarks> public static void RemoveShoppingCar(string id) { if (System.Web.HttpContext.Current.Request.Cookies["Products"] != null && System.Web.HttpContext.Current.Request.Cookies["Products"].Values[id] != null) { System.Web.HttpCookie cookie; System.Web.HttpContext.Current.Request.Cookies["Products"].Values[id] = "0"; string cookievalue = http://www.mamicode.com/System.Web.HttpContext.Current.Request.Cookies["Products"].Value; cookie = new System.Web.HttpCookie("Products", cookievalue); System.Web.HttpContext.Current.Response.AppendCookie(cookie); } } #endregion #region 删除购物车RemoveShoppingCar /// <summary> /// 删除购物车RemoveShoppingCar /// </summary> /// <remarks> /// 使购物车的Cookie为空 /// </remarks> public static void RemoveShoppingCar() { if (System.Web.HttpContext.Current.Request.Cookies["Products"] != null && System.Web.HttpContext.Current.Request.Cookies["Products"].Values.Count != 0) { System.Web.HttpContext.Current.Request.Cookies["Products"].Expires = System.DateTime.Now.AddHours(-1); System.Web.HttpContext.Current.Response.AppendCookie(System.Web.HttpContext.Current.Request.Cookies["Products"]); } } #endregion #region 根据ID修改产品UpdateShoppingCar /// <summary> /// 根据ID修改产品UpdateShoppingCar /// </summary> /// <param name="id">产品ID</param> /// <param name="num">产品数量</param> /// <remarks> /// 更新产品的数量 /// </remarks> public static void UpdateShoppingCar(string id,string num) { if (System.Web.HttpContext.Current.Request.Cookies["Products"] != null && System.Web.HttpContext.Current.Request.Cookies["Products"].Values[id] != null) { System.Web.HttpCookie cookie; System.Web.HttpContext.Current.Request.Cookies["Products"].Values[id] = num; string cookievalue = http://www.mamicode.com/System.Web.HttpContext.Current.Request.Cookies["Products"].Value; cookie = new System.Web.HttpCookie("Products", cookievalue); System.Web.HttpContext.Current.Response.AppendCookie(cookie); } } #endregion #region 得到所有的产品列表GetAllChoppingCar /// <summary> /// 得到所有的产品列表GetAllChoppingCar /// </summary> /// <returns>所有产品的数据集</returns> /// <remarks>因为对DataTable操作比较方便(个人喜好) /// 这里是把里面的字符串分割为Datatable</remarks> public static DataTable GetAllChoppingCar() { if (System.Web.HttpContext.Current.Request.Cookies["Products"] != null && System.Web.HttpContext.Current.Request.Cookies["Products"].Value.Trim() != "") { DataColumn dcid = new DataColumn("id"); DataColumn dcnum = new DataColumn("num"); DataTable dt = new DataTable(); dt.Columns.Add(dcid); dt.Columns.Add(dcnum); string[] str = System.Web.HttpContext.Current.Request.Cookies["Products"].Value.Split("&"); for (int i = 0; i < str.Length; i++) { DataRow dr = dt.NewRow(); dr["id"] = (str[i].Split("="))[0].ToString(); dr["num"] = (str[i].Split("="))[1].ToString(); if (int.Parse((str[i].Split("="))[1].ToString()) != 0) { dt.Rows.Add(dr); } } return dt; } else { return null; } } #endregion #region 关于购物车Cookie里的DataTable的操作GetCookieByDataTable /// <summary> /// 关于购物车Cookie里的DataTable的操作GetCookieByDataTable /// </summary> /// <param name="dt"></param> /// <remarks> /// 把读出来的DataTable转换为字符串 /// 根据的规则是自己定的 &符号是分开产品 /// =号是分开产品ID和产品价格 /// </remarks> /// <returns></returns> public static String GetCookieByDataTable(DataTable dt) { String datatable = ""; if (dt.Rows.Count > 0) { for (int i = 0; i < dt.Rows.Count; i++) { datatable = dt.Rows[i]["id"].ToString() + "=" + dt.Rows[i]["num"].ToString() + "&" + datatable; } } return datatable; } #endregion #region 把字符串转换为datatable GetDataTable /// <summary> /// 把字符串转换为datatable GetDataTable /// </summary> /// <param name="datatable"></param> /// <remarks> /// 把Cookie里的字符串转换为DataTable /// 是GetCookieByDataTable的反操作 /// </remarks> /// <returns></returns> public static DataTable GetDataTable(string datatable) { DataColumn dcid = new DataColumn("id"); DataColumn dcnum = new DataColumn("num"); DataTable dt = new DataTable(); dt.Columns.Add(dcid); dt.Columns.Add(dcnum); if (!datatable.StartsWith("&")) { string[] str = datatable.Split("&"); for (int i = 0; i < str.Length; i++) { DataRow dr = dt.NewRow(); dr["id"] = (str[i].Split("="))[0].ToString(); dr["num"] = (str[i].Split("="))[1].ToString(); if (int.Parse((str[i].Split("="))[1].ToString()) != 0) { dt.Rows.Add(dr); } } } else { DataRow dr = dt.NewRow(); dr["id"] = (datatable.Split("="))[0].ToString(); dr["num"] = (datatable.Split("="))[1].ToString(); if (int.Parse((datatable.Split("="))[1].ToString()) != 0) { dt.Rows.Add(dr); } } return dt; } #endregion
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