我已经创建，将参照此问题的文件是：
TechnicainSelectionView.xaml
TechnicianSelectionView.cs
TechnicianSelectionViewModel.cs
Technician.cs (Code First Entity)
我在我的TechnicanSelectionView.xaml下面的XAML
<UserControl xmlns etc... here"
d:DesignHeight="48" d:DesignWidth="300">
<Grid>
<StackPanel>
<Label Content="Select a Technican to run the test" FontWeight="Bold"></Label>
<ComboBox ItemsSource="{Binding Technicians, Mode=TwoWay}"></ComboBox>
</StackPanel>
</Grid>
</UserControl>
技术员到的属性的ItemSource设置绑定到其状态Cannot resolve Technicians due to an unknown DataContext.
因此，如果我们看一下我的TechnicianSelectionView.cs代码隐藏...
public partial class TechnicianSelectionView : UserControl
{
public TechnicianSelectionViewModel ViewModel { get; private set; }
public TechnicianSelectionView()
{
InitializeComponent();
Technician.GenerateSeedData();
ViewModel = new TechnicianSelectionViewModel();
DataContext = ViewModel;
}
}
......我们看到，我设置视图的DataContext的我TechnicianSelectionViewModel ...
public class TechnicianSelectionViewModel : ViewModelBase
{
public ObservableCollection<Technician> Technicians { get; set; }
public TechnicianSelectionViewModel()
{
Technicians = new ObservableCollection<Technician>();
}
public bool IsLoaded { get; private set; }
public void LoadTechnicians()
{
List<Technician> technicians;
using (var db = new TestContext())
{
var query = from tech in db.Technicians
select tech;
foreach (var technician in query)
{
Technicians.Add(technician);
}
}
IsLoaded = true;
}
}
Techicians是我的ViewModel属性...
所以在已经设置的DataContext的观点，为什么不能解析的视图模型作为技术人员在DataContext /属性它要结合？
编辑：
按下面的评论的关注。 这是设计的时间问题，而不是编译时间。 我应该在一开始已经表明这一点。
