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修改后三角形自动放大

    <Grid x:Name="LayoutRoot">

        <Grid.RowDefinitions>
            <RowDefinition/>
        </Grid.RowDefinitions>

        

        <Button Width="305" HorizontalAlignment="Left" Content="Button1" Template="{DynamicResource ButtonControlTemplate1}" Cursor="Hand" Margin="52,45,0,142" Click="Button_Click_1">
            <Button.Resources>
                <ControlTemplate x:Key="ButtonControlTemplate1" TargetType="{x:Type Button}">
                    <Grid>
                        <Ellipse x:Name="ButtonEllipse" Width="Auto" Height="Auto" StrokeThickness="4" Fill="White" Stroke="Gray"></Ellipse>
                        <Polygon x:Name="ButtonPolygon" Stretch="Fill" Points="0,50 100,0 100,100" Stroke="White" StrokeThickness="2">
                            <Polygon.Fill>
                                <SolidColorBrush Color="Gray" Opacity="0.4"/>
                            </Polygon.Fill>
                        </Polygon>
                    </Grid>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsMouseOver" Value="True">
                            <Setter TargetName="ButtonPolygon" Property="Fill" Value="Black"></Setter>
                        </Trigger>
                        <Trigger Property="IsPressed" Value="True">
                            <Setter TargetName="ButtonPolygon" Property="Fill" Value="Gray"/>
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Button.Resources>
        </Button>
    </Grid>

自定义控件上使用代创建

xaml:

<UserControl x:Class="WpfApplication1.UserControl1"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
             mc:Ignorable="d"
             d:DesignHeight="439" d:DesignWidth="437" Loaded="UserControl_Loaded">
    
    <UserControl.Resources>
        <ControlTemplate x:Key="ButtonControlTemplate1" TargetType="{x:Type Button}">
            <Grid>
                <Polygon x:Name="ButtonPolygon" Stretch="Fill" Points="0,50 100,0 100,100" Stroke="White" StrokeThickness="2">
                    <Polygon.Fill>
                        <SolidColorBrush Color="Gray" Opacity="0.4"/>
                    </Polygon.Fill>
                </Polygon>
            </Grid>
            <ControlTemplate.Triggers>
                <Trigger Property="IsMouseOver" Value="True">
                    <Setter TargetName="ButtonPolygon" Property="Fill" Value="Black"></Setter>
                </Trigger>
                <Trigger Property="IsPressed" Value="True">
                    <Setter TargetName="ButtonPolygon" Property="Fill" Value="red"/>
                </Trigger>
            </ControlTemplate.Triggers>
        </ControlTemplate>
    </UserControl.Resources>
    
    
</UserControl>

code:

    public partial class UserControl1 : UserControl
    {
        public UserControl1()
        {
            InitializeComponent();
        }

        private void UserControl_Loaded(object sender, RoutedEventArgs e)
        {
            Button button1 = new Button();
            this.AddChild(button1);
            button1.Template = (ControlTemplate)(this.Resources["ButtonControlTemplate1"]);
            button1.Click += button1_Click;
        }

        private void button1_Click(object sender, RoutedEventArgs e)
        {
            MessageBox.Show("sss");
        }


    }