How to set MouseOver event/trigger for border in XAML?

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臣服心动
臣服心动 2020-11-28 07:29

I want the border to turn green when the mouse is over it and then to return to blue when the mouse is no longer over the border.

I attempted this without any luck:

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  • 2020-11-28 07:56

    Yes, this is confusing...

    According to this blog post, it looks like this is an omission from WPF.

    To make it work you need to use a style:

        <Border Name="ClearButtonBorder" Grid.Column="1" CornerRadius="0,3,3,0">
            <Border.Style>
                <Style>
                    <Setter Property="Border.Background" Value="Blue"/>
                    <Style.Triggers>
                        <Trigger Property="Border.IsMouseOver" Value="True">
                            <Setter Property="Border.Background" Value="Green" />
                        </Trigger>
                    </Style.Triggers>
                </Style>
            </Border.Style>
            <TextBlock HorizontalAlignment="Center" VerticalAlignment="Center" Text="X" />
        </Border>
    

    I guess this problem isn't that common as most people tend to factor out this sort of thing into a style, so it can be used on multiple controls.

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