在WPF中，应MVVM ViewModel的参与打开一个窗口，如关于窗口？ [英] In WPF,MVVM should ViewModel be involved in opening a window, e.g. About-window?

问题描述

我有一个标准的WPF TreeView和已绑定的物品，查看模型类。

我现在要处理的行为，当项目是双击（打开文档visual-工作室的风格）。

我可以得到事件处理程序在控制住房火树视图（如图所示XAML），但我怎么绑定到具体行为上的观点模型类 - 如： ProjectViewModel

优选结合到ICommand的-实施者，因为这是在别处使用...

为任何由于注释

安德斯，丹麦

 <树视图的ItemsSource = {结合项目}MouseDoubleClick =TreeView_MouseDoubleClick> 
< TreeView.ItemContainerStyle> 
<  - ！
这种风格结合一个树型视图到TreeViewItemViewModel。 
  - > 
<风格的TargetType ={X：类型的TreeViewItem}> 
< setter属性=IsExpandedVALUE ={结合IsExpanded，模式=双向}/> 
< setter属性=IsSelectedVALUE ={结合IsSelected，模式=双向}/> 
< setter属性=粗细VALUE =正常/> 
< Style.Triggers> 
<触发属性=IsSelectedVALUE =真> 
< setter属性=粗细VALUE =大胆/> 
< /触发> 
< /Style.Triggers> 
< /样式和GT; 
< /TreeView.ItemContainerStyle> 
 
< TreeView.Resources> 
< HierarchicalDataTemplate数据类型={X：类型实现：ProjectViewModel}的ItemsSource ={结合儿童}> 
< StackPanel的方向=横向> 
<图像宽度=16高度=16保证金=3,0来源=Images\Region.png/> 
< TextBlock的文本={结合显示名称}/> 
< / StackPanel的> 
< / HierarchicalDataTemplate> 
 
< HierarchicalDataTemplate数据类型={X：类型实现：PumpViewModel}的ItemsSource ={结合儿童}> 
< StackPanel的方向=横向> 
<图像宽度=16高度=16保证金=3,0来源=Images\State.png/> 
< TextBlock的文本={绑定名称}/> 
< / StackPanel的> 
< / HierarchicalDataTemplate> 
 
<数据类型的DataTemplate ={X：类型实现：PumpDesignViewModel}> 
< StackPanel的方向=横向> 
<图像宽度=16高度=16保证金=3,0来源=Images\City.png/> 
< TextBlock的文本={绑定名称}/> 
< / StackPanel的> 
< / DataTemplate中> 
< /TreeView.Resources> 
< / TreeView的> 
  

解决方案

要在标题-问题：是的。主视图的VM应该显示AboutBox的。

但该消息的身体似乎有所不同，也许你可以在上面一点点扩大？

I have a standard WPF treeview and have bound items to view model classes.

I now wish to handle behaviour when items are double-clicked (opening documents visual-studio-style).

I can get event-handler to fire in the control housing the treeview (xaml shown), but how do I bind to specific behaviour on the view model classes - e.g. ProjectViewModel?

Preferable bound to ICommand-implementer, as this is used elsewhere...

Thanks for any comments,

Anders, Denmark

    <TreeView ItemsSource="{Binding Projects}" MouseDoubleClick="TreeView_MouseDoubleClick">
        <TreeView.ItemContainerStyle>
            <!-- 
    This Style binds a TreeViewItem to a TreeViewItemViewModel. 
    -->
            <Style TargetType="{x:Type TreeViewItem}">
                <Setter Property="IsExpanded" Value="{Binding IsExpanded, Mode=TwoWay}" />
                <Setter Property="IsSelected" Value="{Binding IsSelected, Mode=TwoWay}" />
                <Setter Property="FontWeight" Value="Normal" />
                <Style.Triggers>
                    <Trigger Property="IsSelected" Value="True">
                        <Setter Property="FontWeight" Value="Bold" />
                    </Trigger>
                </Style.Triggers>
            </Style>
        </TreeView.ItemContainerStyle>

        <TreeView.Resources>
            <HierarchicalDataTemplate DataType="{x:Type Implementations:ProjectViewModel}" ItemsSource="{Binding Children}">
                <StackPanel Orientation="Horizontal">
                    <Image Width="16" Height="16" Margin="3,0" Source="Images\Region.png" />
                    <TextBlock Text="{Binding DisplayName}" />
                </StackPanel>
            </HierarchicalDataTemplate>

            <HierarchicalDataTemplate DataType="{x:Type Implementations:PumpViewModel}" ItemsSource="{Binding Children}">
                <StackPanel Orientation="Horizontal">
                    <Image Width="16" Height="16" Margin="3,0" Source="Images\State.png" />
                    <TextBlock Text="{Binding Name}" />
                </StackPanel>
            </HierarchicalDataTemplate>

            <DataTemplate DataType="{x:Type Implementations:PumpDesignViewModel}">
                <StackPanel Orientation="Horizontal">
                    <Image Width="16" Height="16" Margin="3,0" Source="Images\City.png" />
                    <TextBlock Text="{Binding Name}" />
                </StackPanel>
            </DataTemplate>
        </TreeView.Resources>
    </TreeView>

解决方案

To the Title-question: Yes. The VM of the Main View should show the AboutBox.

But the body of the message seems different, maybe you can expand on it a little?

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