StackPanel 中的 ScrollViewer

Question

<StackPanel Name="mypanel">
   <ScrollViewer Height="{Binding ElementName=mypanel, Path=ActualHeight}">

我需要，Height = mypanel.ActualHeight-60。

我该怎么做？

编辑：

<StackPanel Name="mypanel">
    <ContentControl Content="{Binding HeaderPart}" /> <= here must be Expander
    <ScrollViewer Height="{Binding ElementName=mypanel, Path=ActualHeight, Converter={StaticResource HeightConverter}}" >
        <StackPanel>
        </StackPanel>
    </ScrollViewer>

当没有Expander 时，一切正常。当Expander 是，mypanel.ActualHeight，HeightAdjustmentConverter = 0。

发生了什么？

Answer 1

您需要编写一个IValueConverter，它接受ActualHeight 并返回一个负60 的新值。

类似：

[ValueConversion(typeof(double), typeof(double))]
public class HeightAdjustmentConverter: IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        double original = (double)value;
        return double - 60;
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        double adjusted = (double)value;
        return adjusted + 60;
    }
}