ActualWidth always returns 0

Question

The ActualWidth of StretchingGrid is always 0. I tried a lot of solutions i found here (UpdateLayout(),....), but none of them worked for me.

<Grid x:Name="StretchingGrid" HorizontalAlignment="Stretch" Background="Red">
         <Grid x:Name="GridMenu" HorizontalAlignment="Left" Background="LightBlue" Width="30">

         </Grid>
    </Grid>


    <Storyboard x:Key="OpenMenu">
         <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(FrameworkElement.Width)" Storyboard.TargetName="GridMenu">
                            <EasingDoubleKeyFrame KeyTime="0" Value="30"/>
                            <EasingDoubleKeyFrame KeyTime="0:0:0.5" Value="{Binding ActualWidth, ElementName=StretchingGrid}"/>
         </DoubleAnimationUsingKeyFrames>
    </Storyboard>

Where exactly are you calling the `UpdateLayout`? If you are calling it in the consctructor, the `FrameworkElement` is probably not render yet, so the `ActualWidth` will be 0 — Nekeniehl, Oct 15 '18 at 13:56
Right after `InitializeComponent()`. I also tried it in the Eventhandler that fires the Storyboard. — David Aichinger, Oct 15 '18 at 13:58
Not sure if it will solve the problem and cannot try it now, but I would do the `UpdateLayout` it on the `Load` of the Window and check if I get the value of `ActualWidth` from code behind first. — Nekeniehl, Oct 15 '18 at 14:03
You mean it is still 0 when you are accesing it after Load()? — Nekeniehl, Oct 15 '18 at 14:46
`ActualWidth` is null even when i call it in de `Window_Loaded` Eventhandler. — David Aichinger, Oct 15 '18 at 15:09
@DavidAichinger: It would be helpful if you could provide a [MCVE](https://stackoverflow.com/help/mcve). — mm8, Oct 15 '18 at 15:19
The problem is just in this piece of code...i think it doesn't matter how many elements are in the grid...in Codebehind there ist just a Button_Click Handler that fires the Storyboard — David Aichinger, Oct 15 '18 at 15:31
Try this approach: https://stackoverflow.com/a/1695518/2315752 — Nekeniehl, Oct 15 '18 at 15:44
@Nekeniehl i tried this already, but it didn't work :/. I called the `Measure()` and `Arrange()` right after `InitializeComponent()`, is that correct? — David Aichinger, Oct 15 '18 at 20:24
@DavidAichinger, Could you please post the .cs file of this view? — Nekeniehl, Oct 16 '18 at 07:57

ActualWidth always returns 0

0 Answers0