我正在寻找的行为基本上是DockPanel的行为，我希望最后一个孩子来填充可用空间。问题是我希望它成为最后一个可见的孩子。就我而言，我想同时显示两个视图。
到目前为止，我已经尝试将两种不同的样式应用于网格，但两种样式似乎都不起作用。我也尝试过使用在理论上似乎可行的转换器（我可以使用double.NaN返回“ Auto”），但是我不确定如何从代码中返回宽度“ *”。
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*">
<ColumnDefinition.Style>
<Style TargetType="{x:Type ColumnDefinition}">
<Style.Triggers>
<DataTrigger Binding="{Binding Visibility, ElementName=ccSomeItems}" Value="Collapsed">
<Setter Property="Width" Value="0" />
</DataTrigger>
</Style.Triggers>
</Style>
</ColumnDefinition.Style>
</ColumnDefinition>
<ColumnDefinition Width="*">
<ColumnDefinition.Style>
<Style TargetType="{x:Type ColumnDefinition}">
<Style.Triggers>
<DataTrigger Binding="{Binding SomeOtherItems.AllOtherItems.Count, Converter={StaticResource IntegerToVisibilityConverter}}" Value="Collapsed">
<Setter Property="Width" Value="0" />
</DataTrigger>
</Style.Triggers>
</Style>
</ColumnDefinition.Style>
</ColumnDefinition>
</Grid.ColumnDefinitions>
<ContentControl x:Name="ccSomeItems" Content="{Binding SomeItems}" Margin="4" Visibility="{Binding SomeItems.AllItems.Count, Converter={StaticResource IntegerToVisibilityConverter}}" />
<ContentControl Grid.Column="1" Content="{Binding SomeOtherItems}" Margin="4" Visibility="{Binding SomeOtherItems.AllOtherItems.Count, Converter={StaticResource IntegerToVisibilityConverter}}" />
</Grid>
我能够处理Rachel的评论，并使用转换器找到解决方案。
XAML：
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="{Binding Visibility, ElementName=SomeItems, Converter={StaticResource VisibilityToGridLengthConverter}}" />
<ColumnDefinition Width="{Binding Visibility, ElementName=SomeOtherItems, Converter={StaticResource VisibilityToGridLengthConverter}}" />
</Grid.ColumnDefinitions>
<ContentControl x:Name="SomeItems" Content="{Binding SomeItems}" Visibility="{Binding SubPackages.AllPackages.Count, Converter={StaticResource IntegerToVisibilityConverter}}" />
<ContentControl x:Name="SomeOtherItems" Grid.Column="1" Content="{Binding SomeOtherItems}" Visibility="{Binding Elements.AllElements.Count, Converter={StaticResource IntegerToVisibilityConverter}}" />
</Grid>
和转换器：
[ValueConversion(typeof(Visibility), typeof(GridLength))]
public class VisibilityToGridLengthConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
return (Visibility)value == Visibility.Collapsed ? new GridLength(0) : new GridLength(1, GridUnitType.Star);
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
throw new NotImplementedException();
}
}
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