WPF 将 RowDefinition.Height 属性绑定到另一个 RowDefinition，在 DataTemplate 中 Height=Auto
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WPF Bind RowDefinition.Height property to another RowDefinition with Height=Auto within DataTemplate
提问by user1119308
I'd like to make 3 rows in a grid in a WPF datatemplate. The first is set to Height=Auto, the second fills the available space and the third is equal to the first. I've tried with binding to elementname, but that doesn't seem to work
我想在 WPF 数据模板的网格中创建 3 行。第一个设置为 Height=Auto，第二个填充可用空间，第三个等于第一个。我尝试绑定到 elementname，但这似乎不起作用
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" x:Name="definition" />
<RowDefinition Height="*" />
<RowDefinition Height="{Binding ElementName=definition, Path=ActualHeight}" />
</Grid.RowDefinitions>
<TextBox Grid.Row="0" Height="100" />
</Grid>
In this example I hope the height of the third row is also 100px. Any suggestions?
在这个例子中，我希望第三行的高度也是 100px。有什么建议？
回答by Erti-Chris Eelmaa
RowDefinition.ActualHeightis not an actually dependency property, which means your binding won't get any "updates" about ActualHeightbeing changed.
RowDefinition.ActualHeight不是实际的依赖属性，这意味着您的绑定不会获得任何关于ActualHeight被更改的“更新” 。
You can follow this pattern:
您可以遵循以下模式：
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="*" />
<RowDefinition Height="{Binding ElementName=FirstRow, Path=ActualHeight}" />
<Grid Grid.Row="0" x:Name="FirstRow" />
<Grid Grid.Row="1" x:Name="SecondRow" />
<Grid Grid.Row="2" x:Name="ThirdRow" />
</Grid.RowDefinitions>
The reason this should work theoretically, is simple enough: RowDefinition.ActualHeight == FirstRow.ActualHeight(by default it should fill available space)
这在理论上应该有效的原因很简单：（RowDefinition.ActualHeight == FirstRow.ActualHeight默认情况下它应该填充可用空间）
Alternatively, just steal the RowDefinition, and perhaps create your own CustomRowDefinition which can implement dependency property, called ActualHeight, and fire updates.
或者，只需窃取 RowDefinition，或者创建您自己的 CustomRowDefinition，它可以实现依赖属性，称为ActualHeight，并触发更新。
http://dotnetinside.com/in/type/PresentationFramework/RowDefinition/4.0.0.0
http://dotnetinside.com/in/type/PresentationFramework/RowDefinition/4.0.0.0
回答by Victory Jessie
Try this:
尝试这个：
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*" />
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<Grid Height="100" Background="Red" x:Name="definition"/>
<Grid Background="Green" Grid.Row="1"/>
<Grid Background="Blue" Grid.Row="2" Height="{Binding ElementName=definition, Path=ActualHeight}"/>
</Grid>
