汇总ObservableCollection的总数<；我的类型>；带有Linq表达式

我有一个Silverlight委托，它在EventArgs Result中获得一个ObservableCollection。DTO myType包含字段Order、StartDate、Status、PlannedAmount、ActualAmount和其他一些字段。WCF服务端的查询为每个订单获取几行，仅根据PlannedAmount和ActualAmount而变化。

Order # | StartDate | PlannedAmount| ActualAmount | Order Comments ....
Order A | March 15  |    20.00     |     0.00     | Comment 1 ...
Order A | March 15  |    30.00     |     0.00     | Comment 1 ...
Order A | March 15  |    10.00     |     0.00     | Comment 1 ...
Order A | March 15  |     0.00     |    30.00     | Comment 1 ...
Order B | March 25  |    10.00     |      0       | Comment 2 ...
Order B | March 25  |     0.00     |     5.00     | Comment 2 ...

我希望每个订单只显示一行，并将所有PlannedAmount和ActualAmount值相加。我更喜欢在表示层中更改这一点，因为我不知道WCF操作的其他使用者需要什么。所以我想把它汇总到…

Order # | StartDate | PlannedAmount| ActualAmount | Order Comments ....
Order A | March 15  |    60.00     |    30.00     | Comment 1 ...
Order B | March 25  |    10.00     |    5.00      | Comment 2 ...

然后把它做成一个ObservableCollection，和我以前的类型一样。

我已经尝试过了，但除了Key和Sum值之外，我似乎什么都得不到。

    var Orders =
        from wo in OrdersPerOperation
        group wo by wo.OrderNo
        into g
        select new
        {
            OrderNo = g.Key,
            Planned = g.Sum(wo => wo.Planned),
            Actual = g.Sum(wo => wo.Actual),
            OrderComments = g.Select(wo => wo.Equipment),
            StartDate = g.Select(wo => wo.StartDate),
            Status = g.Select(wo => wo.Status),
            OrderType = g.Select(wo => wo.OrderType) //,...
        };

编辑
只得到密钥和两个总和是直接的：

var Orders =
        from wo in OrdersPerOperation
        group wo by wo.OrderNo
        into g
        select new
        {
            OrderNo = g.Key,
            Planned = g.Sum(wo => wo.Planned),
            Actual = g.Sum(wo => wo.Actual)
        }

挑战在于获得所有其他领域，这些领域是重复的，也会在结果中显示出来。

编辑
我猜测这可能像自引用SQL查询一样工作。我相信我在这方面走在了正确的轨道上，因为每个元素都有正确格式的数据。在所有这些Linq混乱之前，我仍然无法将结果设置为Silverlight网格的ItemsSource，我可以绑定它。IDE警告我FirstOrDefault可能是NullReferenceException。

var workOrders = from wo in workOrdersPerOperation
                group wo by wo.OrderNo
                into g
                select new
                {
                    OrderNo = g.Key,
                    Planned = g.Sum(wo => wo.Planned),
                    Actual = g.Sum(wo => wo.Actual),
                    g.FirstOrDefault(wo => wo.OrderNo == g.Key).Location,
                    g.FirstOrDefault(wo => wo.OrderNo == g.Key).Equipment,
                    g.FirstOrDefault(wo => wo.OrderNo == g.Key).StartDate,
                    g.FirstOrDefault(wo => wo.OrderNo == g.Key).Status,
                    g.FirstOrDefault(wo => wo.OrderNo == g.Key).OrderType,
                    g.FirstOrDefault(wo => wo.OrderNo == g.Key).AccType,
                    g.FirstOrDefault(wo => wo.OrderNo == g.Key).WorkCenter,
                    g.FirstOrDefault(wo => wo.OrderNo == g.Key).Description,
                    g.FirstOrDefault(wo => wo.OrderNo == g.Key).Priority
                };

有人能帮我走过这一步吗？我仍然需要将它绑定到控件。

Location = g.FirstOrDefault(wo => wo.OrderNo == g.Key).Location,

Location = g.FirstOrDefault().Location,

Location = g.First().Location,

var orders = from wo in ordersPerOperation
    group wo by wo.OrderNo
    into g
    select new MyType
    {
        OrderNo = g.Key,
        Planned = g.Sum(wo => wo.Planned),
        Actual = g.Sum(wo => wo.Actual),
        Location = g.First().Location,
        Equipment = g.First().Equipment,
        StartDate = g.First().StartDate,
        Status = g.First().Status,
        OrderType = g.First().OrderType,
        AccType = g.First().AccType,
        WorkCenter = g.First().WorkCenter,
        Description = g.First().Description,
        Priority = g.First().Priority
    };

OrderComments = g.Select(wo => wo.Equipment).ToList()

var orders = from wo in ordersPerOperation
    group wo by wo.OrderNo
    into g
    select new MyType()
    {
        OrderNo = g.Key,
        Planned = g.Sum(wo => wo.Planned),
        Actual = g.Sum(wo => wo.Actual),
        Location = g.FirstOrDefault(wo => wo.OrderNo == g.Key).Location,
        Equipment = g.FirstOrDefault(wo => wo.OrderNo == g.Key).Equipment,
        StartDate = g.FirstOrDefault(wo => wo.OrderNo == g.Key).StartDate,
        Status = g.FirstOrDefault(wo => wo.OrderNo == g.Key).Status,
        OrderType = g.FirstOrDefault(wo => wo.OrderNo == g.Key).OrderType,
        AccType = g.FirstOrDefault(wo => wo.OrderNo == g.Key).AccType,
        WorkCenter = g.FirstOrDefault(wo => wo.OrderNo == g.Key).WorkCenter,
        Description = g.FirstOrDefault(wo => wo.OrderNo == g.Key).Description,
        Priority = g.FirstOrDefault(wo => wo.OrderNo == g.Key).Priority
    };