Web MVC编程：The length of the string exceeds the value set on the maxJsonLength propert

返回从后台JSON到前台的时候蹦出的错：

The length of the string exceeds the value set on the maxJsonLength propert

网上的解决办法都是说在web.config里加段：

但是没起作用
我的解决办法是：

public ActionResult Get(DateTime dateFrom, DateTime dateTo)
		{
			DataTable list = GetList(dateFrom, dateTo);
			var salegoodsList = list.AsEnumerable().GroupBy(t => t["Dimension0"]).Select(n =>
				new
				{
					goodsid = n.Key,
					qty = n.Sum(s => s["销售数量"] == "" ? 0 : Convert.ToInt32(s["销售数量"])),
					stock = n.Sum(s => s["库存"] == "" ? 0 : Convert.ToInt32(s["库存"]))
				});

                       //关键代码，可设置JSON的长度
			System.Web.Script.Serialization.JavaScriptSerializer serializer = new System.Web.Script.Serialization.JavaScriptSerializer();
			serializer.MaxJsonLength = Int32.MaxValue;

			var retobject = new
			{  salegoodsList = salegoodsList ,
                           dateFrom = dateFrom 
                        }; 
var result = new ContentResult(); 
result.Content = serializer.Serialize(retobject); 
result.ContentType = "application/json"; 
return result;
}