LINQ中的分组列表

我有以下班级的名单:

public class PostOrderDataModel
{
    public string OCN { get; set; }
    public string Quantity { get; set; }
    public string VerticalTypeName { get; set; }
    public Dictionary<string, string> VerticalTypeQuantity { get; set; }
}

具有具有相同OCN的多个实例:

List<PostOrderDataModel> lstPostOrderDataModel = new List<PostOrderDataModel>();

lstPostOrderDataModel[0] = new PostOrderDataModel { OCN = "AX", Quantity = "1", VerticalTypeName = "Internet", VerticalTypeQuantity = null} ; 
lstPostOrderDataModel[1] = new PostOrderDataModel { OCN = "AX", Quantity = "2", VerticalTypeName = "Video", VerticalTypeQuantity = null}; 
lstPostOrderDataModel[2] = new PostOrderDataModel { OCN = "BX", Quantity = "2", VerticalTypeName = "Phone", VerticalTypeQuantity = null}; 

key 数量为 value VerticalTypeQuantity ?

var results = lstPostOrderDataModel.GroupBy(
    p => p.OCN,
    p => p.VerticalTypeName,
    (key, g) => new { OCN = key, VerticalTypeName = g.ToList() });

上面的代码仅针对每个OCN提供VerticalTypeName。我也想要数量,这样我就可以在字典里加上。