wpf 绑定到父控件中的属性
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原文地址: http://stackoverflow.com/questions/15789090/
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bind to a property in the parent control
提问by lebhero
i have the following case:
我有以下情况：
Window
|_Grid
|_ListView (MainProductGrid)
|_View
|_GridView
|_GridViewColumn
|_CellTemplate
|_DataTemplate
|_Label (LabelID)
now, i want to display in the LabelID the index of the row in the ListView. so i made the following:
现在，我想在 LabelID 中显示 ListView 中行的索引。所以我做了以下事情：
<ListView ItemsSource="{Binding Path=ProductItems}" AlternationCount="{Binding Path=ProductItems.Count}">
...
and for the label i have the following:
对于标签，我有以下内容：
<Label x:Name="LabelID"
Content="{Binding RelativeSource={RelativeSource Mode=TemplatedParent},
Path=(ListView.AlternationIndex)}"/>
but it LabelID is only showing 0.. so i think the TemplatedParent is not pointing to the ListView control.. so how can i correct the binding to point to the "upper parent" which is in my case the ListView ?
但它 LabelID 只显示 0 .. 所以我认为 TemplatedParent 没有指向 ListView 控件.. 那么我如何更正绑定以指向“上层父级”，在我的情况下是 ListView ？
thanks in advance
提前致谢
################Update: here is the complete xaml ...
更新：这是完整的 xaml ...
<Grid x:Name="mainGrid">
<ListView ItemsSource="{Binding Path=ProductItems}" AlternationCount="{Binding Path=ProductItems.Count}" x:Name="MainProductGrid">
<ListView.View>
<GridView AllowsColumnReorder="False">
<GridViewColumn x:Name="gvc" Header="id" Width="auto">
<GridViewColumn.CellTemplate>
<DataTemplate>
<Label Content="{Binding (ListView.AlternationIndex),RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ListView}}}"/>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
<GridViewColumn Header="Product name" DisplayMemberBinding="{Binding Path=ProductName}" Width="auto" />
</GridView>
</ListView.View>
</ListView>
</Grid>
回答by user1064519
please try this :
请试试这个：
<Label Content="{Binding (ListView.AlternationIndex),
RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ListViewItem}}}" />
Update: here is the corret xaml, the binding should be to relativae source=ListViewItem, yet there was a problem with the grid column width:
更新：这里是 corret xaml，绑定应该是 relativae source=ListViewItem，但网格列宽有问题：
<ListView.View>
<GridView AllowsColumnReorder="False">
<GridViewColumn x:Name="gvc" Header="id" Width="30">
<GridViewColumn.CellTemplate>
<DataTemplate>
<TextBlock Text="{Binding (ListView.AlternationIndex),
RelativeSource={RelativeSource FindAncestor,
AncestorType={x:Type ListViewItem}}}"/>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
<GridViewColumn Header="Product name"
DisplayMemberBinding="{Binding Path=ProductName}"
Width="auto" />
</GridView>
</ListView.View>
回答by mlemay
You can use
您可以使用
RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ListView}}
to find a specific control above you
找到您上方的特定控件
回答by DHN
Well since you're in the context of a DataTemplateyou cannot access the property via TemplatedParentmode, at least in your case. It refers to the element to which the template (in which the data-bound element exists) is applied. [...]LinkI'm not sure, that it can be used in a DataTemplatebecause I've only seen it in ControlTemplates, but since the docs are not telling otherwise...
好吧，由于您处于 a 的上下文中，因此DataTemplate您无法通过TemplatedParent模式访问该属性，至少在您的情况下是这样。它指的是应用模板（数据绑定元素存在于其中）的元素。[...]链接我不确定它是否可以在 a 中使用，DataTemplate因为我只在 中看到过它ControlTemplates，但是由于文档没有说明其他情况......
What you can do is to try find the Ancestor. E.g.
您可以做的是尝试找到Ancestor. 例如
<Label Content="{Binding AlternationIndex,
RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ListView}}" ... />
I didn't used in DataTemplatesyet, so no warranty.
我还没用过DataTemplates，所以没有保修。
