c# – 当前上下文中不存在名称“con”

在select之后的代码中,我尝试获取ActivityID值,但列表’con’不可用.

List<Contribution> contributions =
    contLogic.GetAllContibutionsByActivityIDToList(ActivityID);

var groups = from con in contributions
             group con by con.Response
             into gResponse
             select new
             {
                grop = gResponse.Count(),con.ActivityID
             };

我看过微软的样本,我不知道我做错了什么.

微软示例：

List<Product> products = GetProductList();

var orderGroups = from prod in products
                  group prod by prod.Category into prodGroup
                  select new { Category = prodGroup.Key,Products = prodGroup };

ObjectDumper.Write(orderGroups,1);