嗨，我正在尝试通过棱镜中的视图模型实例化视图，但没有成功。显示该窗口，但没有更新任何模块区域。
请看下面的代码片段：
public class Bootstrapper : UnityBootstrapper
{
private ShellViewModel shellViewModel;
protected override DependencyObject CreateShell()
{
// register shell types
var container = ServiceLocator.Current.GetInstance<IUnityContainer>();
container.RegisterType<IShellView, ShellWindow>("ShellView");
container.RegisterType<Object, ShellViewModel>("ShellViewModel");
shellViewModel = container.Resolve<ShellViewModel>();
this.Shell = shellViewModel.View as DependencyObject;
return this.Shell;
//return new ShellWindow();
}
...
并且视图模型定义如下
public class ShellViewModel : ViewModelBase<IShellView>
{
public ShellViewModel([Dependency("ShellView")]IShellView view)
: base(view)
{
}
}
public interface IShellView : IView
{
void ShowMessageInOutputWindow(string message);
}
/// <summary>
/// Abstract base class for a ViewModel implementation.
/// </summary>
/// <typeparam name="TView">The type of the view. Do provide an interface as type and not the concrete type itself.</typeparam>
public abstract class ViewModelBase<TView> : ViewBase where TView : IView
{
/// <summary>
/// The view.
/// </summary>
private readonly TView view;
/// <summary>
/// Initializes a new instance of the <see cref="ViewModel<TView>"/> class and
/// attaches itself as <c>DataContext</c> to the view.
/// </summary>
/// <param name="view">The view.</param>
protected ViewModelBase(TView view)
: base(view)
{
this.view = view;
}
/// <summary>
/// Gets the associated view as specified view type.
/// </summary>
/// <remarks>
/// Use this property in a ViewModel class to avoid casting.
/// </remarks>
public TView View
{
get { return this.view; }
}
}
使用系统；使用 System.ComponentModel；使用 System.Threading；使用 System.Windows.Threading；
/// /// 所有视图模型的基类 /// 公共抽象类 ViewBase : INotifyPropertyChanging, INotifyPropertyChanged { /// /// 视图。/// 私有的只读 IView 视图；
/// <summary>
/// Initializes a new instance of the <see cref="ViewModelBase"/> class and
/// attaches itself as <c>DataContext</c> to the view.
/// </summary>
/// <param name="view">The view.</param>
protected ViewBase(IView view)
{
if (view == null)
{
throw new ArgumentNullException("view");
}
this.view = view;
// Check if the code is running within the WPF application model
if (SynchronizationContext.Current is DispatcherSynchronizationContext)
{
// Set DataContext of the view has to be delayed so that the ViewModel can initialize the internal data (e.g. Commands)
// before the view starts with DataBinding.
Dispatcher.CurrentDispatcher.BeginInvoke((Action)delegate
{
this.view.DataContext = this;
});
}
else
{
// When the code runs outside of the WPF application model then we set the DataContext immediately.
this.view.DataContext = this;
}
}
#region INotifyPropertyChanging Members
public event PropertyChangingEventHandler PropertyChanging;
#endregion
#region INotifyPropertyChanged Members
public event PropertyChangedEventHandler PropertyChanged;
#endregion
#region Administrative Properties
/// <summary>
/// Whether the view model should ignore property-change events.
/// </summary>
public virtual bool IgnorePropertyChangeEvents { get; set; }
#endregion
#region Public Methods
/// <summary>
/// Raises the PropertyChanged event.
/// </summary>
/// <param name="propertyName">The name of the changed property.</param>
public virtual void RaisePropertyChangedEvent(string propertyName)
{
// Exit if changes ignored
if (IgnorePropertyChangeEvents) return;
// Exit if no subscribers
if (PropertyChanged == null) return;
// Raise event
var e = new PropertyChangedEventArgs(propertyName);
PropertyChanged(this, e);
}
/// <summary>
/// Raises the PropertyChanging event.
/// </summary>
/// <param name="propertyName">The name of the changing property.</param>
public virtual void RaisePropertyChangingEvent(string propertyName)
{
// Exit if changes ignored
if (IgnorePropertyChangeEvents) return;
// Exit if no subscribers
if (PropertyChanging == null) return;
// Raise event
var e = new PropertyChangingEventArgs(propertyName);
PropertyChanging(this, e);
}
}
#endregion
/// <summary>
/// Represents a view
/// </summary>
public interface IView
{
/// <summary>
/// Gets or sets the data context of the view.
/// </summary>
object DataContext { get; set; }
/// <summary>
/// Initializes the view
/// </summary>
void Initialize();
}