问题是：如何将任何WebBrowser事件绑定到ItemTemplate中我的View Model中的ICommand属性？
当我尝试使用Expression混合交互库在MvvmLight方式中正常执行此操作时，一个例外就会出现：
错误集合属性 'Microsoft.VisualStudio.DesignTools.WpfDesigner.InstanceBuilders.HwndHostInstance'。 '触发器' 是空的。
WebTabItems是可观察的项目集合ViewModels
这是代码：
<TabControl ItemsSource="{Binding WebTabItems}" SelectedItem="{Binding SelectedWebTabItem}" VerticalAlignment="Stretch" HorizontalAlignment="Stretch" >
<i:Interaction.Triggers>
<i:EventTrigger EventName="SelectionChanged">
<mvvm:EventToCommand Command="{Binding SelectionChangedVMCommand}" PassEventArgsToCommand="True"></mvvm:EventToCommand>
</i:EventTrigger>
</i:Interaction.Triggers>
<TabControl.ItemTemplate>
<!--header-->
<DataTemplate>
<TextBlock Text="{Binding Header}"></TextBlock>
</DataTemplate>
</TabControl.ItemTemplate>
<TabControl.ContentTemplate>
<DataTemplate>
<Grid >
<Grid.RowDefinitions>
<RowDefinition Height="auto"></RowDefinition>
<RowDefinition></RowDefinition>
</Grid.RowDefinitions>
<TextBlock Text="{Binding NotificationRibbonText}" Visibility="{Binding NotificationRibbonVisibility}"></TextBlock>
<WebBrowser Grid.Row="1" Visibility="Visible" local:WebBrowserExtension.BindableSource="{Binding Sourse}" >
<i:Interaction.Triggers>
<i:EventTrigger EventName="Navigating">
<mvvm:EventToCommand Command="{Binding NavigatingMVCommand}" PassEventArgsToCommand="True" ></mvvm:EventToCommand>
</i:EventTrigger>
</i:Interaction.Triggers>
</WebBrowser>
</Grid>
</DataTemplate>
</TabControl.ContentTemplate>
</TabControl>
选项卡控件中的事件绑定效果很好，但模板中没有
xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
<i:Interaction.Triggers>
<i:EventTrigger EventName="Navigating">
<mvvm:EventToCommand Command="{Binding NavigatingMVCommand}" PassEventArgsToCommand="True" ></mvvm:EventToCommand>
</i:EventTrigger>
</i:Interaction.Triggers>
答案 0 :(得分：0)
如果在模板中绑定事件或使用表达式混合交互库是不可能的话，请回答
ICommand类型的附加属性是您可以通过其他方式实现相同功能的。
此答案也可用于绑定到非路由事件
在我的情况下： XAML
<WebBrowser Grid.Row="1" Visibility="Visible"
local:WebBrowserExtension.BindableSource="{Binding NavigeteToSourse}"
local:WebBrowserExtension.NavigatingCmdExtended="{Binding NavigatingMVCommand}"
>
</WebBrowser>
分隔的类，用于将附加的依赖项属性添加到原始Web浏览器
class WebBrowserExtension
{
#region BindableSourceProperty
public static readonly DependencyProperty BindableSourceProperty =
DependencyProperty.RegisterAttached("BindableSource", typeof(string), typeof(WebBrowserExtension), new UIPropertyMetadata("", BindableSourcePropertyChanged));
public static string GetBindableSource(DependencyObject obj)
{
return (string)obj.GetValue(BindableSourceProperty);
}
public static void SetBindableSource(DependencyObject obj, string value)
{
obj.SetValue(BindableSourceProperty, value);
}
public static void BindableSourcePropertyChanged(DependencyObject o, DependencyPropertyChangedEventArgs e)
{
WebBrowser browser = o as WebBrowser;
if (browser != null)
{
string uri = e.NewValue as string;
browser.Source = !String.IsNullOrEmpty(uri) ? new Uri(uri) : null;
}
}
#endregion
#region NavigatingCmdExtended
public static ICommand GetNavigatingCmdExtended(DependencyObject obj)
{
return (ICommand)obj.GetValue(NavigatingCmdExtendedProperty);
}
public static void SetNavigatingCmdExtended(DependencyObject obj, ICommand value)
{
obj.SetValue(NavigatingCmdExtendedProperty, value);
}
// Using a DependencyProperty as the backing store for CalenderOpenCommand. This enables animation, styling, binding, etc...
public static readonly DependencyProperty NavigatingCmdExtendedProperty =
DependencyProperty.RegisterAttached("NavigatingCmdExtended", typeof(ICommand), typeof(WebBrowserExtension), new PropertyMetadata(OnChangedNavigatingCmdExtendedProperty));
private static void OnChangedNavigatingCmdExtendedProperty(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
var webBrowser = d as WebBrowser;
if (webBrowser != null)
{
if (e.NewValue != null)
{
//attach event handler
webBrowser.Navigating += webBrowser_Navigating;
}
else
{
//detach event handler
webBrowser.Navigating -= webBrowser_Navigating;
}
}
}
///
/// Event handler for Calender Opened event.
///
///
///
static void webBrowser_Navigating(object sender, NavigatingCancelEventArgs e)
{
ICommand command = GetNavigatingCmdExtended(sender as DependencyObject);
if (command != null)
{
if (command.CanExecute(e))
{
//executes a command
command.Execute(e);
}
}
}
#endregion
和ViewModel中的命令
public class WebTabItemVievModel: ViewModelBase
{
public WebTabItemVievModel()
{
NavigatingMVCommand = new RelayCommand<NavigatingCancelEventArgs>(NavigatingMethod);
}
public ICommand NavigatingMVCommand { get; set; }
private void NavigatingMethod(NavigatingCancelEventArgs e)
{
Messenger.Default.Send<NotificationMessage <UriChangedMSG>>(new NotificationMessage<UriChangedMSG> (new UriChangedMSG { NewUri = e.Uri.AbsoluteUri },"test"));
CurrentUri = e.Uri.AbsoluteUri;
NotificationRibbonText = e.Uri.AbsoluteUri;
}
有关详细信息，请参阅此文章：