How to Fit WPF StackPanel to Grid Cell

c#, stackpanel, wpf, wpf-controls

Solution

Your `StackPanel` is not in `Grid`, it`s inside `Border`. So for it to take all available space you can set horizontal and vertical alignment to `Stretch` both for it and its parent `Border`:

<Grid>
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="1*"/>
        <ColumnDefinition Width="1*"/>
    </Grid.ColumnDefinitions>
    <Grid.RowDefinitions>
        <RowDefinition Height="74*"/>
        <RowDefinition Height="74*"/>
       <RowDefinition Height="421*"/>
    </Grid.RowDefinitions>

    <Border HorizontalAlignment="Stretch" VerticalAlignment="Stretch" 
            BorderBrush="Black" BorderThickness="1"  Grid.Row="2">
        <StackPanel VerticalAlignment="Stretch" HorizontalAlignment="Stretch">
            <Label Content="Log in"/>
        </StackPanel>
    </Border>
</Grid>

Even so, like others mentioned, some other panel almost definetely will be better in this case.

Problem

I have a StackPanel control in my WPF project, and it is in column 0 row 2 of a Grid. How can I autofit the StackPanel size to the size of that grid cell? Setting the StackPanel width and height to "auto" will just size it to its contents. I could explicitly set its width and height to numerical values, but I was wondering if there was a cleaner, more accurate way. Thank you. Relevant XAML: ``` <Grid> <Grid.ColumnDefinitions> <ColumnDefinition Width="1*"/> <ColumnDefinition Width="1*"/> </Grid.ColumnDefinitions> <Grid.RowDefinitions> <RowDefinition Height="74*"/> <RowDefinition Height="74*"/> <RowDefinition Height="421*"/> </Grid.RowDefinitions> <Label Content="{StaticResource LoginWindow_Title}" Style="{StaticResource TitleH1}" Grid.ColumnSpan="2"/> <Label Content="{StaticResource LoginWindow_Subtitle}" Style="{StaticResource TitleH2}" Grid.Row="1" Grid.ColumnSpan="2"/> <Border BorderBrush="Black" BorderThickness="1" HorizontalAlignment="Center" Grid.Row="2" VerticalAlignment="Top"> <StackPanel HorizontalAlignment="Left" Grid.Row="2" VerticalAlignment="Top"> <Label Content="Log in"/> </StackPanel> </Border> </Grid> ```

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