关键是我是用js表单提交跳转的  

@啰嗦: 那你就用ajax跳转，不知道是不是下面的代码

前台：

 1 $.ajax({
 2                             type: 'POST',
 3                             url: 'testCookie1',
 4                             async: false, 
 5                             data: {  },
 6                             success: function (result) {
 7                                 $.ajax({
 8                                     type: 'POST',
 9                                     url: 'testCookie2',
10                                     async: false, 
11                                     data: {},
12                                     success: function (result) {
13 
14 
15                                     }
16                                 });
17 
18 
19                             }
20                         });

后台：

1 public void testCookie1()
2         {
3             HttpCookie cookie = new HttpCookie("shoppingCart", "value1");
4             Response.Cookies.Add(cookie);
5         }
6         public void testCookie2()
7         {
8             object obj = Request.Cookies["shoppingCart"];
9         }

 购物车页面 ：

js

//去结算
function GoSettlement(goods)
{
var data = "{'goods':'" + goods + "'}";
$.ajax({
type: "Post",
cache: false,
contentType: "application/json",
url: "/ShoppingCart/CookiePath?t=" + Math.random(),
data: data,
dataType: "text",
async: true,
success: function (m) {
if (m == "ok") {
$("#postGoods").val(goods);
$("#cartForm").submit();
} else {
xq_alert("结算失败", "warn");
}
},
error: function (e) {
xq_alert("链接服务器超时，请检查你的网络连接", "error");
}
});
}

后端：

[HttpPost]
public string AddShoppingCart(int goodId, string goodName, string mobilePic, string salePrice, int goodsNum_)
{
try
{
if (Request.Cookies["shoppingCart"] == null)
{
cookie = new HttpCookie("shoppingCart");
cookie.Values.Add("" + goodId + "", Server.UrlEncode("" + goodName + "," + mobilePic + "," + salePrice + "," + goodsNum_ + ""));
cookie.Path = "/";
cookie.Expires = DateTime.Now.AddDays(1);
Response.Cookies.Add(cookie);
}
else
{
cookie = Request.Cookies["shoppingCart"];
for (int i = 0; i < cookie.Values.Count; i++)
{
if (cookie.Values.AllKeys[i] == goodId.ToString())
{
string[] goods = Server.UrlDecode(cookie.Values[i]).Split(',');
cookie["" + goodId + ""] = Server.UrlEncode("" + goods[0] + "," + goods[1] + "," + goods[2] + "," + (Convert.ToInt32(goodsNum_) + Convert.ToInt32(goods[3])) + "");
break;
}
}
cookie.Values.Add("" + goodId + "", Server.UrlEncode("" + goodName + "," + mobilePic + "," + salePrice + "," + goodsNum_ + ""));
cookie.Path = "/";
cookie.Expires = DateTime.Now.AddDays(1);
Response.Cookies.Add(cookie);
}
return "ok";
}
catch (Exception)
{

return "no";
}
}

订单页面

后端：

public ActionResult SubmitOrder()
{
if (CurrentUserInfo == null)
{
return null;
}
string gids = Request.Form["postGoods"].ToString() ?? "";
string shopId = CurrentUserInfo.Id;
if (!string.IsNullOrEmpty(gids)) GoodsCookieById(gids);
ViewBag.Detail = shop.GetShopDetailBy(shopId);
ViewBag.Contact = shop.GetShopContactBy(shopId);
return View();
}
//根据ID获取购物车Cookie的数据
public HttpCookie GoodsCookieById(string gids)
{
if (Response.Cookies["shoppingCart"] == null)
{
string value = "";
string[] goods = gids.Split(',');
for (int i = 0; i < goods.Length; i++)
{
cookie = Response.Cookies["shoppingCart"];
for (int j = 0; j < cookie.Values.Count; j++)
{

if (cookie.Values.AllKeys[j] == goods[i])
{
value += cookie.Values[HttpUtility.UrlEncode(goods[i])];
break;
}
}
}
}
return null;
}

@twxstar: 我是用了ajax  可是还是不行  那个Response.Cookies["shoppingCart"] 到了订单页面就获取不到 在购物车还好好的到了页面跳转就失效了 

@twxstar: 问题已解决谢谢了