WPF ScrollViewer resize problem - wpf

Question

I've got a scrollviewer in a WPF window that is resizing according to its contents no matter what I do. This is kind of a problem since it will resize my window as well, and in my opinion defeats the purpose of a scrollviewer.
The window in question has its SizeToContent set to "WidthAndHeight" which I know can be set to "Manual" to resolve the scrollviewer issues, but then I have to go and fiddle with my window layout.
Is there any way to get the best of both worlds here? All I want is for the scrollviewer to stay the same (its current) size any time its content changes.
EDIT:
If you really need to see it.....
<Window SizeToContent="WidthAndHeight">
<Grid Width="200" Name="ThinkBeforeSpeaking">
<ScrollViewer VerticalScrollBars="Auto" HorizontalScrollBars="Auto">
<ContentControl Content={Binding AnythingYouCanImagine}"/>
</ScrollViewer>
</Grid>
</Window>
Doesn't need to be a content control inside of the viewer, just anything bigger than the window in either dimension.

Answer 1

I've just come across this problem myself, and I've found a suitable solution in wrapping the ScrollViewer in a Canvas, so that it doesn't take part in the measuring pass, and telling the ScrollViewer to use the ActualHeight and ActualWidth of the Canvas so that it takes up all the space the Canvas has been given:
<Window SizeToContent="WidthAndHeight">
<Grid Width="200" Name="ThinkBeforeSpeaking">
<Canvas>
<ScrollViewer VerticalScrollBars="Auto" HorizontalScrollBars="Auto"
Height="{Binding Parent.ActualHeight, Mode=OneWay, RelativeSource={RelativeSource Self}}"
Width="{Binding Parent.ActualWidth, Mode=OneWay, RelativeSource={RelativeSource Self}}">
<ContentControl Content={Binding AnythingYouCanImagine}"/>
</ScrollViewer>
</Canvas>
</Grid>
</Window>
As it stands, there's nothing telling the window to have any height at all, so either one of the existing controls (Window, Grid or Canvas) needs a defined Height/MinHeight, or other controls need to be added which will provide their own Height/MinHeight.

Answer 2

I'm assuming you want your Window to start sized large enough to fit it's content, but then if the content changes it will not resize.
If so, you'd need to reset the SizeToContent option when the Window is loaded, like so:
public MainWindow() {
InitializeComponent();
this.Loaded += (s, e) => { this.SizeToContent = SizeToContent.Manual; };
}

Answer 3

In your example you're using the WidthAndHeight behavior for your Window. The Window's Width will expand to the 200px you set on your Grid, but then you have no control to dictate which Height the Window needs to have.
Consequently, the Window's Height will resize to the ScrollViewer's content, unless you specify a fixed Height or MaxHeight for your ScrollViewer or Grid (Or any other container between the Window and the ScrollViewer).
<Window SizeToContent="WidthAndHeight">
<Grid Width="200" Height="150" Name="ThinkBeforeSpeaking">
<ScrollViewer VerticalScrollBars="Auto" HorizontalScrollBars="Auto">
<ContentControl Content={Binding AnythingYouCanImagine}"/>
</ScrollViewer>
</Grid>
</Window>
Think of it, which Height would the Window have otherwise? None? Infinite? There's nothing in your XAML that specifies it.