Silverlight 向列表框动态添加eventtocommand操作_Silverlight_Windows Phone 7_Mvvm Light

Silverlight 向列表框动态添加eventtocommand操作

silverlight windows-phone-7

Silverlight 向列表框动态添加eventtocommand操作,silverlight,windows-phone-7,mvvm-light,Silverlight,Windows Phone 7,Mvvm Light,我有一页写着 <ContentControl x:Name="target1" Grid.Row="1" DataContext="{Binding SelectedItem}" Margin="20,0"> <ContentControl.Template> <ControlTemplate> <StackPanel>

我有一页写着

        <ContentControl x:Name="target1" Grid.Row="1" DataContext="{Binding SelectedItem}" Margin="20,0">
            <ContentControl.Template>
                <ControlTemplate>
                    <StackPanel>
                        <StackPanel Orientation="Horizontal">
                            <TextBlock Text="Name:" Margin="0,0,10,0"/>
                            <TextBlock Text="{Binding Name}"/>
                        </StackPanel>
                        <ListBox ItemsSource="{Binding SubItems}">
                            <ListBox.ItemContainerStyle>
                                <Style TargetType="ListBoxItem">
                                    <Setter Property="Padding" Value="1"/>
                                    <Setter Property="HorizontalContentAlignment" Value="Stretch"/>
                                </Style>
                            </ListBox.ItemContainerStyle>
                            <ListBox.ItemTemplate>
                                <DataTemplate>
                                    <Border Background="navy" BorderBrush="White" BorderThickness="1">
                                        <TextBlock Text="{Binding Name}"/>
                                    </Border>
                                </DataTemplate>
                            </ListBox.ItemTemplate>
                        </ListBox>
                    </StackPanel>
                </ControlTemplate>
            </ContentControl.Template>
        </ContentControl>
    </Grid>
</Grid>

名称空间：

xmlns:Custom="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity" 
xmlns:GalaSoft_MvvmLight_Command="clr-namespace:GalaSoft.MvvmLight.Command;assembly=GalaSoft.MvvmLight.Extras.WP7"

        <ContentControl x:Name="target1" Grid.Row="1" DataContext="{Binding SelectedItem}" Margin="20,0">
            <ContentControl.Template>
                <ControlTemplate>
                    <StackPanel>
                        <StackPanel Orientation="Horizontal">
                            <TextBlock Text="Name:" Margin="0,0,10,0"/>
                            <TextBlock Text="{Binding Name}"/>
                        </StackPanel>
                        <ListBox ItemsSource="{Binding SubItems}">
                            <ListBox.ItemContainerStyle>
                                <Style TargetType="ListBoxItem">
                                    <Setter Property="Padding" Value="1"/>
                                    <Setter Property="HorizontalContentAlignment" Value="Stretch"/>
                                </Style>
                            </ListBox.ItemContainerStyle>
                            <ListBox.ItemTemplate>
                                <DataTemplate>
                                    <Border Background="navy" BorderBrush="White" BorderThickness="1">
                                        <TextBlock Text="{Binding Name}"/>
                                    </Border>
                                </DataTemplate>
                            </ListBox.ItemTemplate>
                        </ListBox>
                    </StackPanel>
                </ControlTemplate>
            </ContentControl.Template>
        </ContentControl>
    </Grid>
</Grid>

设计时的xaml：

<ListBox  x:Name="ItemGroupsList" ItemsSource="{Binding ItemGroups}" Height="496" 
                SelectedItem="{Binding SelectedItemGroup, Mode=TwoWay}" >
    <Custom:Interaction.Triggers>
         <Custom:EventTrigger EventName="SelectionChanged">
             <GalaSoft_MvvmLight_Command:EventToCommand 
                     x:Name="SelectionChangedEvent" 
                     Command="{Binding GoToEditItemGroupCommand, Mode=OneWay}" 
                     PassEventArgsToCommand="True"/>
        </Custom:EventTrigger>
    </Custom:Interaction.Triggers>

        <ContentControl x:Name="target1" Grid.Row="1" DataContext="{Binding SelectedItem}" Margin="20,0">
            <ContentControl.Template>
                <ControlTemplate>
                    <StackPanel>
                        <StackPanel Orientation="Horizontal">
                            <TextBlock Text="Name:" Margin="0,0,10,0"/>
                            <TextBlock Text="{Binding Name}"/>
                        </StackPanel>
                        <ListBox ItemsSource="{Binding SubItems}">
                            <ListBox.ItemContainerStyle>
                                <Style TargetType="ListBoxItem">
                                    <Setter Property="Padding" Value="1"/>
                                    <Setter Property="HorizontalContentAlignment" Value="Stretch"/>
                                </Style>
                            </ListBox.ItemContainerStyle>
                            <ListBox.ItemTemplate>
                                <DataTemplate>
                                    <Border Background="navy" BorderBrush="White" BorderThickness="1">
                                        <TextBlock Text="{Binding Name}"/>
                                    </Border>
                                </DataTemplate>
                            </ListBox.ItemTemplate>
                        </ListBox>
                    </StackPanel>
                </ControlTemplate>
            </ContentControl.Template>
        </ContentControl>
    </Grid>
</Grid>

在代码中，我在运行时生成多个列表框，并希望能够像上面显示的xaml代码一样绑定到viewmode上的relaycommand

        <ContentControl x:Name="target1" Grid.Row="1" DataContext="{Binding SelectedItem}" Margin="20,0">
            <ContentControl.Template>
                <ControlTemplate>
                    <StackPanel>
                        <StackPanel Orientation="Horizontal">
                            <TextBlock Text="Name:" Margin="0,0,10,0"/>
                            <TextBlock Text="{Binding Name}"/>
                        </StackPanel>
                        <ListBox ItemsSource="{Binding SubItems}">
                            <ListBox.ItemContainerStyle>
                                <Style TargetType="ListBoxItem">
                                    <Setter Property="Padding" Value="1"/>
                                    <Setter Property="HorizontalContentAlignment" Value="Stretch"/>
                                </Style>
                            </ListBox.ItemContainerStyle>
                            <ListBox.ItemTemplate>
                                <DataTemplate>
                                    <Border Background="navy" BorderBrush="White" BorderThickness="1">
                                        <TextBlock Text="{Binding Name}"/>
                                    </Border>
                                </DataTemplate>
                            </ListBox.ItemTemplate>
                        </ListBox>
                    </StackPanel>
                </ControlTemplate>
            </ContentControl.Template>
        </ContentControl>
    </Grid>
</Grid>

如何在运行时在视图的代码隐藏中执行上述操作

        <ContentControl x:Name="target1" Grid.Row="1" DataContext="{Binding SelectedItem}" Margin="20,0">
            <ContentControl.Template>
                <ControlTemplate>
                    <StackPanel>
                        <StackPanel Orientation="Horizontal">
                            <TextBlock Text="Name:" Margin="0,0,10,0"/>
                            <TextBlock Text="{Binding Name}"/>
                        </StackPanel>
                        <ListBox ItemsSource="{Binding SubItems}">
                            <ListBox.ItemContainerStyle>
                                <Style TargetType="ListBoxItem">
                                    <Setter Property="Padding" Value="1"/>
                                    <Setter Property="HorizontalContentAlignment" Value="Stretch"/>
                                </Style>
                            </ListBox.ItemContainerStyle>
                            <ListBox.ItemTemplate>
                                <DataTemplate>
                                    <Border Background="navy" BorderBrush="White" BorderThickness="1">
                                        <TextBlock Text="{Binding Name}"/>
                                    </Border>
                                </DataTemplate>
                            </ListBox.ItemTemplate>
                        </ListBox>
                    </StackPanel>
                </ControlTemplate>
            </ContentControl.Template>
        </ContentControl>
    </Grid>
</Grid>

另外，我想将动态生成的列表框的datacontext分配给不同的视图模型，而不是当前绑定到我的视图的视图模型

        <ContentControl x:Name="target1" Grid.Row="1" DataContext="{Binding SelectedItem}" Margin="20,0">
            <ContentControl.Template>
                <ControlTemplate>
                    <StackPanel>
                        <StackPanel Orientation="Horizontal">
                            <TextBlock Text="Name:" Margin="0,0,10,0"/>
                            <TextBlock Text="{Binding Name}"/>
                        </StackPanel>
                        <ListBox ItemsSource="{Binding SubItems}">
                            <ListBox.ItemContainerStyle>
                                <Style TargetType="ListBoxItem">
                                    <Setter Property="Padding" Value="1"/>
                                    <Setter Property="HorizontalContentAlignment" Value="Stretch"/>
                                </Style>
                            </ListBox.ItemContainerStyle>
                            <ListBox.ItemTemplate>
                                <DataTemplate>
                                    <Border Background="navy" BorderBrush="White" BorderThickness="1">
                                        <TextBlock Text="{Binding Name}"/>
                                    </Border>
                                </DataTemplate>
                            </ListBox.ItemTemplate>
                        </ListBox>
                    </StackPanel>
                </ControlTemplate>
            </ContentControl.Template>
        </ContentControl>
    </Grid>
</Grid>

基本上，我有一个panaroma，每个panaroma项目都是动态创建的，每个panaroma项目都有一个列表框，该列表框将绑定到带有RelayCommand的viewmodel上

        <ContentControl x:Name="target1" Grid.Row="1" DataContext="{Binding SelectedItem}" Margin="20,0">
            <ContentControl.Template>
                <ControlTemplate>
                    <StackPanel>
                        <StackPanel Orientation="Horizontal">
                            <TextBlock Text="Name:" Margin="0,0,10,0"/>
                            <TextBlock Text="{Binding Name}"/>
                        </StackPanel>
                        <ListBox ItemsSource="{Binding SubItems}">
                            <ListBox.ItemContainerStyle>
                                <Style TargetType="ListBoxItem">
                                    <Setter Property="Padding" Value="1"/>
                                    <Setter Property="HorizontalContentAlignment" Value="Stretch"/>
                                </Style>
                            </ListBox.ItemContainerStyle>
                            <ListBox.ItemTemplate>
                                <DataTemplate>
                                    <Border Background="navy" BorderBrush="White" BorderThickness="1">
                                        <TextBlock Text="{Binding Name}"/>
                                    </Border>
                                </DataTemplate>
                            </ListBox.ItemTemplate>
                        </ListBox>
                    </StackPanel>
                </ControlTemplate>
            </ContentControl.Template>
        </ContentControl>
    </Grid>
</Grid>

描述如何从代码隐藏附加行为

        <ContentControl x:Name="target1" Grid.Row="1" DataContext="{Binding SelectedItem}" Margin="20,0">
            <ContentControl.Template>
                <ControlTemplate>
                    <StackPanel>
                        <StackPanel Orientation="Horizontal">
                            <TextBlock Text="Name:" Margin="0,0,10,0"/>
                            <TextBlock Text="{Binding Name}"/>
                        </StackPanel>
                        <ListBox ItemsSource="{Binding SubItems}">
                            <ListBox.ItemContainerStyle>
                                <Style TargetType="ListBoxItem">
                                    <Setter Property="Padding" Value="1"/>
                                    <Setter Property="HorizontalContentAlignment" Value="Stretch"/>
                                </Style>
                            </ListBox.ItemContainerStyle>
                            <ListBox.ItemTemplate>
                                <DataTemplate>
                                    <Border Background="navy" BorderBrush="White" BorderThickness="1">
                                        <TextBlock Text="{Binding Name}"/>
                                    </Border>
                                </DataTemplate>
                            </ListBox.ItemTemplate>
                        </ListBox>
                    </StackPanel>
                </ControlTemplate>
            </ContentControl.Template>
        </ContentControl>
    </Grid>
</Grid>

然而，我坚决不建议你走这条路，除非你有一个迫切的需要这样做。如果在
ViewModel
中使用此方法，则会失去所有可测试性，因为它会生成一个与
视图高度耦合的ViewModel ，事实上，没有它就无法生存。（旁注：出于这个原因，如果需要，将事件参数返回到ViewModel 使用CommandParameter 来返回DataContext 也是不好的做法） <ContentControl x:Name="target1" Grid.Row="1" DataContext="{Binding SelectedItem}" Margin="20,0"> <ContentControl.Template> <ControlTemplate> <StackPanel> <StackPanel Orientation="Horizontal"> <TextBlock Text="Name:" Margin="0,0,10,0"/> <TextBlock Text="{Binding Name}"/> </StackPanel> <ListBox ItemsSource="{Binding SubItems}"> <ListBox.ItemContainerStyle> <Style TargetType="ListBoxItem"> <Setter Property="Padding" Value="1"/> <Setter Property="HorizontalContentAlignment" Value="Stretch"/> </Style> </ListBox.ItemContainerStyle> <ListBox.ItemTemplate> <DataTemplate> <Border Background="navy" BorderBrush="White" BorderThickness="1"> <TextBlock Text="{Binding Name}"/> </Border> </DataTemplate> </ListBox.ItemTemplate> </ListBox> </StackPanel> </ControlTemplate> </ContentControl.Template> </ContentControl> </Grid> </Grid> 通常，您可以用另一种方式使用MVVM归档您的目标，本文的其余部分将对此进行描述 <ContentControl x:Name="target1" Grid.Row="1" DataContext="{Binding SelectedItem}" Margin="20,0"> <ContentControl.Template> <ControlTemplate> <StackPanel> <StackPanel Orientation="Horizontal"> <TextBlock Text="Name:" Margin="0,0,10,0"/> <TextBlock Text="{Binding Name}"/> </StackPanel> <ListBox ItemsSource="{Binding SubItems}"> <ListBox.ItemContainerStyle> <Style TargetType="ListBoxItem"> <Setter Property="Padding" Value="1"/> <Setter Property="HorizontalContentAlignment" Value="Stretch"/> </Style> </ListBox.ItemContainerStyle> <ListBox.ItemTemplate> <DataTemplate> <Border Background="navy" BorderBrush="White" BorderThickness="1"> <TextBlock Text="{Binding Name}"/> </Border> </DataTemplate> </ListBox.ItemTemplate> </ListBox> </StackPanel> </ControlTemplate> </ContentControl.Template> </ContentControl> </Grid> </Grid> 首先，您不需要使用命令来获取所选属性，也不需要获取此属性已更改的通知。通常的模式是将列表框的SelectedItem 绑定到ViewModel 中的属性。现在，您可以使用PropertyChanged 事件跟踪此属性何时更改 <ContentControl x:Name="target1" Grid.Row="1" DataContext="{Binding SelectedItem}" Margin="20,0"> <ContentControl.Template> <ControlTemplate> <StackPanel> <StackPanel Orientation="Horizontal"> <TextBlock Text="Name:" Margin="0,0,10,0"/> <TextBlock Text="{Binding Name}"/> </StackPanel> <ListBox ItemsSource="{Binding SubItems}"> <ListBox.ItemContainerStyle> <Style TargetType="ListBoxItem"> <Setter Property="Padding" Value="1"/> <Setter Property="HorizontalContentAlignment" Value="Stretch"/> </Style> </ListBox.ItemContainerStyle> <ListBox.ItemTemplate> <DataTemplate> <Border Background="navy" BorderBrush="White" BorderThickness="1"> <TextBlock Text="{Binding Name}"/> </Border> </DataTemplate> </ListBox.ItemTemplate> </ListBox> </StackPanel> </ControlTemplate> </ContentControl.Template> </ContentControl> </Grid> </Grid> 其次，使用模板生成列表框并设置其样式。如果只需要在选中项目时显示它们，请使用BooleanToVisibility （转换器并使用转换器将子列表框的Visibility 属性绑定到ViewModel 上的属性（不是示例） <ContentControl x:Name="target1" Grid.Row="1" DataContext="{Binding SelectedItem}" Margin="20,0"> <ContentControl.Template> <ControlTemplate> <StackPanel> <StackPanel Orientation="Horizontal"> <TextBlock Text="Name:" Margin="0,0,10,0"/> <TextBlock Text="{Binding Name}"/> </StackPanel> <ListBox ItemsSource="{Binding SubItems}"> <ListBox.ItemContainerStyle> <Style TargetType="ListBoxItem"> <Setter Property="Padding" Value="1"/> <Setter Property="HorizontalContentAlignment" Value="Stretch"/> </Style> </ListBox.ItemContainerStyle> <ListBox.ItemTemplate> <DataTemplate> <Border Background="navy" BorderBrush="White" BorderThickness="1"> <TextBlock Text="{Binding Name}"/> </Border> </DataTemplate> </ListBox.ItemTemplate> </ListBox> </StackPanel> </ControlTemplate> </ContentControl.Template> </ContentControl> </Grid> </Grid> 该示例创建一个列表框，该列表框将其ItemsSource 绑定到ViewModel 的Items属性。它进一步创建一个ContentControl ，该ContentControl将其DataContext 绑定到ViewModel 的SelectedItem 。然后ContentControl 再次包含一个ListBox 其中DataContext 绑定到ItemViewModel 的子项属性。MainViewModel 生成在设计时和运行时显示的测试数据 <ContentControl x:Name="target1" Grid.Row="1" DataContext="{Binding SelectedItem}" Margin="20,0"> <ContentControl.Template> <ControlTemplate> <StackPanel> <StackPanel Orientation="Horizontal"> <TextBlock Text="Name:" Margin="0,0,10,0"/> <TextBlock Text="{Binding Name}"/> </StackPanel> <ListBox ItemsSource="{Binding SubItems}"> <ListBox.ItemContainerStyle> <Style TargetType="ListBoxItem"> <Setter Property="Padding" Value="1"/> <Setter Property="HorizontalContentAlignment" Value="Stretch"/> </Style> </ListBox.ItemContainerStyle> <ListBox.ItemTemplate> <DataTemplate> <Border Background="navy" BorderBrush="White" BorderThickness="1"> <TextBlock Text="{Binding Name}"/> </Border> </DataTemplate> </ListBox.ItemTemplate> </ListBox> </StackPanel> </ControlTemplate> </ContentControl.Template> </ContentControl> </Grid> </Grid> 文章的其余部分显示了一个示例： <ContentControl x:Name="target1" Grid.Row="1" DataContext="{Binding SelectedItem}" Margin="20,0"> <ContentControl.Template> <ControlTemplate> <StackPanel> <StackPanel Orientation="Horizontal"> <TextBlock Text="Name:" Margin="0,0,10,0"/> <TextBlock Text="{Binding Name}"/> </StackPanel> <ListBox ItemsSource="{Binding SubItems}"> <ListBox.ItemContainerStyle> <Style TargetType="ListBoxItem"> <Setter Property="Padding" Value="1"/> <Setter Property="HorizontalContentAlignment" Value="Stretch"/> </Style> </ListBox.ItemContainerStyle> <ListBox.ItemTemplate> <DataTemplate> <Border Background="navy" BorderBrush="White" BorderThickness="1"> <TextBlock Text="{Binding Name}"/> </Border> </DataTemplate> </ListBox.ItemTemplate> </ListBox> </StackPanel> </ControlTemplate> </ContentControl.Template> </ContentControl> </Grid> </Grid> 1.主页的XAML（除此之外）： <ContentControl x:Name="target1" Grid.Row="1" DataContext="{Binding SelectedItem}" Margin="20,0"> <ContentControl.Template> <ControlTemplate> <StackPanel> <StackPanel Orientation="Horizontal"> <TextBlock Text="Name:" Margin="0,0,10,0"/> <TextBlock Text="{Binding Name}"/> </StackPanel> <ListBox ItemsSource="{Binding SubItems}"> <ListBox.ItemContainerStyle> <Style TargetType="ListBoxItem"> <Setter Property="Padding" Value="1"/> <Setter Property="HorizontalContentAlignment" Value="Stretch"/> </Style> </ListBox.ItemContainerStyle> <ListBox.ItemTemplate> <DataTemplate> <Border Background="navy" BorderBrush="White" BorderThickness="1"> <TextBlock Text="{Binding Name}"/> </Border> </DataTemplate> </ListBox.ItemTemplate> </ListBox> </StackPanel> </ControlTemplate> </ContentControl.Template> </ContentControl> </Grid> </Grid> <ContentControl x:Name="target1" Grid.Row="1" DataContext="{Binding SelectedItem}" Margin="20,0"> <ContentControl.Template> <ControlTemplate> <StackPanel> <StackPanel Orientation="Horizontal"> <TextBlock Text="Name:" Margin="0,0,10,0"/> <TextBlock Text="{Binding Name}"/> </StackPanel> <ListBox ItemsSource="{Binding SubItems}"> <ListBox.ItemContainerStyle> <Style TargetType="ListBoxItem"> <Setter Property="Padding" Value="1"/> <Setter Property="HorizontalContentAlignment" Value="Stretch"/> </Style> </ListBox.ItemContainerStyle> <ListBox.ItemTemplate> <DataTemplate> <Border Background="navy" BorderBrush="White" BorderThickness="1"> <TextBlock Text="{Binding Name}"/> </Border> </DataTemplate> </ListBox.ItemTemplate> </ListBox> </StackPanel> </ControlTemplate> </ContentControl.Template> </ContentControl> </Grid> </Grid> 2.主视图模型 <ContentControl x:Name="target1" Grid.Row="1" DataContext="{Binding SelectedItem}" Margin="20,0"> <ContentControl.Template> <ControlTemplate> <StackPanel> <StackPanel Orientation="Horizontal"> <TextBlock Text="Name:" Margin="0,0,10,0"/> <TextBlock Text="{Binding Name}"/> </StackPanel> <ListBox ItemsSource="{Binding SubItems}"> <ListBox.ItemContainerStyle> <Style TargetType="ListBoxItem"> <Setter Property="Padding" Value="1"/> <Setter Property="HorizontalContentAlignment" Value="Stretch"/> </Style> </ListBox.ItemContainerStyle> <ListBox.ItemTemplate> <DataTemplate> <Border Background="navy" BorderBrush="White" BorderThickness="1"> <TextBlock Text="{Binding Name}"/> </Border> </DataTemplate> </ListBox.ItemTemplate> </ListBox> </StackPanel> </ControlTemplate> </ContentControl.Template> </ContentControl> </Grid> </Grid> public MainViewModel() { // working with fields to ensure no events are fired during initial phase this._items = new ObservableCollection<ItemViewModel>(); for (int i = 0; i < 5; ++i) { var item = new ItemViewModel() { Name = string.Format("Item {0}", i) }; for (int j = 0; j < 3; ++j) item.SubItems.Add(new ItemViewModel() { Name = string.Format("{0} - Sub Item {1}", item.Name, j) }); this._items.Add(item); } this.SelectedItem = this._items[0]; if (IsInDesignMode) { // Code runs in Blend --> create design time data. } else { // Code runs "for real" } } #region [Items] /// <summary> /// The <see cref="Items" /> property's name. /// </summary> public const string ItemsPropertyName = "Items"; private ObservableCollection<ItemViewModel> _items = default(ObservableCollection<ItemViewModel>); /// <summary> /// Gets the Items property. /// TODO Update documentation: /// Changes to that property's value raise the PropertyChanged event. /// This property's value is broadcasted by the Messenger's default instance when it changes. /// </summary> public ObservableCollection<ItemViewModel> Items { get { return _items; } set { if (_items == value) { return; } var oldValue = _items; _items = value; // Update bindings, no broadcast RaisePropertyChanged(ItemsPropertyName); // Update bindings and broadcast change using GalaSoft.MvvmLight.Messenging //RaisePropertyChanged(ItemsPropertyName, oldValue, value, true); } } #endregion #region [SelectedItem] /// <summary> /// The <see cref="SelectedItem" /> property's name. /// </summary> public const string SelectedItemPropertyName = "SelectedItem"; private ItemViewModel _selectedItem = default(ItemViewModel); /// <summary> /// Gets the SelectedItem property. /// TODO Update documentation: /// Changes to that property's value raise the PropertyChanged event. /// This property's value is broadcasted by the Messenger's default instance when it changes. /// </summary> public ItemViewModel SelectedItem { get { return _selectedItem; } set { if (_selectedItem == value) { return; } var oldValue = _selectedItem; _selectedItem = value; // Update bindings, no broadcast RaisePropertyChanged(SelectedItemPropertyName); // Update bindings and broadcast change using GalaSoft.MvvmLight.Messenging //RaisePropertyChanged(SelectedItemPropertyName, oldValue, value, true); } } #endregion } public主视图模型（） { //使用字段以确保在初始阶段不会触发任何事件此._items=新的ObservableCollection（）；对于（int i=0；i<5；++i）{ var item=new ItemViewModel（）{Name=string.Format（“item{0}”，i）}；对于（int j=0；j<3；++j） item.SubItems.Add（newitemViewModel（）{Name=string.Format（“{0}-子项{1}”，item.Name，j）}）；此项。添加（项）； } this.SelectedItem=this._项[0]；如果（IsInDesignMode）{ //代码在混合-->创建设计时数据中运行。 }否则{ //代码“真实地”运行 } } #地区[项目] /// ///该属性的名称。 /// public const string ItemsPropertyName=“Items”；私有ObservableCollection _items=默认值（ObservableCollection）； /// ///获取Items属性。 ///TODO更新文档： ///更改该属性的值将引发PropertyChanged事件。 ///此属性的值在更改时由Messenger的默认实例广播。 /// 公共可观测收集项目{ 得到{ 退货(物品);； } 设置{ 如果（_items==值）{ 返回； } var oldValue=_项； _项目=价值； //更新绑定，无广播 RaisePropertyChanged（ItemsPropertyName）； //使用GalaSoft.MvvmLight.messeng更新绑定和广播更改 //RaisePropertyChanged（ItemsPropertyName、oldValue、value、true）； } } #端区 #区域[SelectedItem] /// ///该属性的名称。 /// 公共常量字符串SelectedItemPropertyName=“SelectedItem”；私有项目视图模型_selectedItem=default（项目视图模型）；