StackPanel中的ScrollViewer

Question

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

我需要，Height = mypanel.ActualHeight-60。

我該怎麼辦？

編輯：

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

當沒有Expander，一切工作正常。當Expander是，mypanel.ActualHeight,HeightAdjustmentConverter = 0。

發生了什麼事？

Answer 1

你需要寫一個IValueConverter這需要在ActualHeight並返回一個新的值減去60

喜歡的東西：

[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; 
    } 
}