如何绑定到2个不同的成员在WPF一类？ [英] How to bind to 2 different members in a class in WPF?

问题描述

我有一个类，如：

 类EditorViewModel
{
    公众的ObservableCollection＆lt;效果＆GT; AllEffects;
    公共BOOL HasPermissions;
}
 

但问题是，当我试图绑定 AllEffects 到的ListView ，那么我不能绑定什么 HasPermissions 因为绑定范围仅限于 AllEffects ，而不是 EditorViewModel 。

我试过，但它不工作：

 ＆LT; ListView控件的ItemsSource ={结合EditorViewModel}＆GT;...＆LT; GridViewColumn WIDTH =自动标题=名称＆GT;
    ＆LT; GridViewColumn.CellTemplate＆GT;
        ＆LT;＆DataTemplate的GT;
            ＆LT; TextBlock的文本={结合AllEffects.Name}/＆GT;
        ＆LT; / DataTemplate中＆GT;
    ＆LT; /GridViewColumn.CellTemplate>
＆LT; / GridViewColumn＆GT;＆LT; GridViewColumn WIDTH =自动标题=类型＆GT;
    ＆LT; GridViewColumn.CellTemplate＆GT;
        ＆LT;＆DataTemplate的GT;
            ＆LT; TextBlock的文本={结合AllEffects.Type}/＆GT;
        ＆LT; / DataTemplate中＆GT;
    ＆LT; /GridViewColumn.CellTemplate>
＆LT; / GridViewColumn＆GT;
 

如果我设置了的ItemsSource 到 EditorViewModel 和摆脱 AllEffects ，它的工作原理。但我不知道如何访问 HasPermissions 通过绑定：

 ＆LT; GridViewColumn宽度=50标题=覆盖＆GT;
    ＆LT; GridViewColumn.CellTemplate＆GT;
        ＆LT;＆DataTemplate的GT;
            ＆LT;复选框保证金=0
                                    的Horizo​​ntalAlignment =中心
                                    IsEnabled ={结合HasPermission}/＆GT;
        ＆LT; / DataTemplate中＆GT;
    ＆LT; /GridViewColumn.CellTemplate>
＆LT; / GridViewColumn＆GT;
 




解决方案

一个经典的技巧是使用ViewModelLocator，请参阅：
<一href=\"http://stackoverflow.com/questions/3829418/mvvm-light-using-viewmodellocator-properties-hit-multiple-times\">MVVM灯 - ​​使用ViewModelLocator - 性能击中多次

此外，为了更快速和肮脏的解决方案，你可以使用下面的绑定：

  {绑定的RelativeSource = {的RelativeSource模式= FindAncestor，AncestorType =的ListView}，路径= DataContext.HasPermissions}
 

请注意，这可能仅仅在WPF的工作，而不是在SL，SL以来不支持的RelativeSource这个语法。

I have a class like:

class EditorViewModel
{
    public ObservableCollection<Effect> AllEffects;
    public bool HasPermissions;
}

But the problem is, when I am trying to bind AllEffects to ListView, then I can't bind anything to HasPermissions because the binding scope is limited to AllEffects, not EditorViewModel.

I tried this but it doesn't work:

<ListView ItemsSource="{Binding EditorViewModel}">

...

<GridViewColumn Width="Auto" Header="Name">
    <GridViewColumn.CellTemplate>
        <DataTemplate>
            <TextBlock Text="{Binding AllEffects.Name}"/>
        </DataTemplate>
    </GridViewColumn.CellTemplate>
</GridViewColumn>

<GridViewColumn Width="Auto" Header="Type">
    <GridViewColumn.CellTemplate>
        <DataTemplate>
            <TextBlock Text="{Binding AllEffects.Type}"/>
        </DataTemplate>
    </GridViewColumn.CellTemplate>
</GridViewColumn>

If I set the ItemsSource to EditorViewModel and get rid of AllEffects, it works. But then I don't know how to access HasPermissions through binding:

<GridViewColumn Width="50" Header="Override">
    <GridViewColumn.CellTemplate>
        <DataTemplate>
            <CheckBox Margin="0"
                                    HorizontalAlignment="Center"
                                    IsEnabled="{Binding HasPermission}"/>
        </DataTemplate>
    </GridViewColumn.CellTemplate>
</GridViewColumn>

解决方案

A classic trick is to use ViewModelLocator, see: MVVM Light - using ViewModelLocator - properties hit multiple times

also, for a more quick-and-dirty solution, you can use the following Binding:

{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=ListView}, Path=DataContext.HasPermissions}

Note that this would only work on WPF and not in SL, since SL doesn't support this syntax of RelativeSource.

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