wp7 ObservableCollection人口

Question

我正在使用AMCharts控件，但我尝试按照该示例进行操作，但是我不确定如何将我的historyItemCollection（图1）中的数据获取到Observable集合（图2）中？

图。1：

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

图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，我有一个要放入轴值的日期项以及一个要放入值值的成本项（图2 ：）

如何将数据放入observableCollection中，以便可以使用此图表控件？

Answer 1

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

或者在运行时

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);