Dependency property identifier field: HorizontalAlignmentProperty

When Height and Width properties are explicitly set on an object, these measurements take higher precedent during layout and will cancel the typical effects of setting HorizontalAlignment to Stretch.

Canvas does not use HorizontalAlignment when composing layout, because Canvas is based on absolute positioning. In general, the value of HorizontalAlignment is potentially treated differently by any given object that is capable of having one or more FrameworkElement objects as child content.

In the following example, the value Center is assigned to HorizontalAlignment and VerticalAlignment to position the TextBlock elements in the center of the Grid cells.

    <Grid x:Name="LayoutRoot" Background="Coral" Width="300" Height="100" ShowGridLines="True">
    <Grid.ColumnDefinitions>
        <ColumnDefinition />
        <ColumnDefinition />
    </Grid.ColumnDefinitions>
    <Grid.RowDefinitions>
        <RowDefinition />
        <RowDefinition />
    </Grid.RowDefinitions>
    <TextBlock Grid.Column="0" Grid.Row="0" Text="First Name" HorizontalAlignment="Center" VerticalAlignment="Center" />
    <TextBlock Grid.Column="0" Grid.Row="1" Text="Last Name" HorizontalAlignment="Center" VerticalAlignment="Center" />
    <TextBox Grid.Column="1" Grid.Row="0" />
    <TextBox Grid.Column="1" Grid.Row="1" />

</Grid>

The preceding example produces output that is similar to the following illustration.

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

Reference

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