wp7 ObservableCollection人口

Question

我正在使用AMCharts控件，但我嘗試按照該示例進行操作，但是我不確定如何將我的historyItemCollection（圖1）中的數據獲取到Observable集合（圖2）中？

圖。1：

from item in App.ViewModel.historyItemCollection
where item.VehicleId == (Application.Current as App).vehicleId
select item;

圖2：

private ObservableCollection<TestDataItem> _data = new ObservableCollection<TestDataItem>()
{
    new TestDataItem() { axis = "Mar", value=5},
    new TestDataItem() { axis = "Apr", value=15.2},
    new TestDataItem() { axis = "May", value=25},
    new TestDataItem() { axis = "June", value=8.1},
};

在historyitemcollection中，我有一個要放入軸值的日期項以及一個要放入值值的成本項（圖2 ：）

如何將數據放入observableCollection中，以便可以使用此圖表控件？

Answer 1

_data = new ObservableCollection<HistoryItem>
(
    from item in App.ViewModel.historyItemCollection
    where item.VehicleId == (Application.Current as App).vehicleId
    select item;
)

或者在運行時

var historyItems =
    from item in App.ViewModel.historyItemCollection
    where item.VehicleId == (Application.Current as App).vehicleId
    select item;

foreach (var item in historyItems)
    _data.Add(item);