WPF 如何修改button圆角(经典)

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本人想设置Button为圆角，奈何搜索百度，找到的全是坑爹答案，现总结如下：

1. 需要添加button 的template.

2. 设置border的时候，必须要设置background, 否则会提示content 被多次使用。

<Button Grid.Row="3" Grid.Column="2" Content="取消" Margin="30,40,200,40" > 
                <Button.Template > 
                    <ControlTemplate TargetType="{x:Type Button}" > 
                        <Border BorderBrush="{TemplateBinding Control.BorderBrush}" BorderThickness="1" CornerRadius="7,7,7,7"> 
                            <Border.Background>#FFDDDDDD</Border.Background> 
                            <ContentPresenter Content="{TemplateBinding ContentControl.Content}" HorizontalAlignment="Center" VerticalAlignment="Center" ></ContentPresenter> 
                        </Border> 
                    </ControlTemplate> 
                </Button.Template> 
            </Button> 

我们只需要在XAML中给他添加几行代码就可以做成圆角形状。

<Button x:Name="button" Content="按钮" FontSize="40" BorderThickness="0" HorizontalAlignment="Left" Margin="25,58,0,0" VerticalAlignment="Top" Width="472" Height="200" Foreground="White"> 
      <Button.Template> 
           <ControlTemplate TargetType="{x:Type Button}"> 
               <Border BorderThickness="1" BorderBrush="Black" CornerRadius="30" Background="{TemplateBinding Background}"> 
                   <ContentPresenter VerticalAlignment="Center" HorizontalAlignment="Center"/> 
               </Border> 
           </ControlTemplate> 
       </Button.Template> 
</Button> 

属性解析：

BorderThickness：边框的大小

BorderBrush：边框的颜色

CornerRadius：圆角的大小

Background：背景颜色"{TemplateBinding Background}"：这个就是使用上面<Button>的Background属性值作为他的值

<ContentPresenter VerticalAlignment="Center" HorizontalAlignment="Center"/>：文字垂直居中对齐

加个渐变色

<Button x:Name="button" Content="按钮" FontSize="40" BorderThickness="0" HorizontalAlignment="Left" Margin="25,58,0,0" VerticalAlignment="Top" Width="472" Height="200" Foreground="White"> 
            <Button.Background> 
                <LinearGradientBrush EndPoint="1,1" StartPoint="0,0"> 
                    <GradientStop Color="#FFC564B8" Offset="0"/> 
                    <GradientStop Color="#FFF57A7A" Offset="1"/> 
                </LinearGradientBrush> 
            </Button.Background> 
            <Button.Template> 
                <ControlTemplate TargetType="{x:Type Button}"> 
                    <Border BorderThickness="1" CornerRadius="30" Background="{TemplateBinding Background}"> 
                        <ContentPresenter VerticalAlignment="Center" HorizontalAlignment="Center"/> 
                    </Border> 
                </ControlTemplate> 
            </Button.Template> 
        </Button> 

如图：

项目实例：

把样式和空间模板放到资源中，然后去引用

<Window x:Class="WpfApp18.MainWindow" 
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
        xmlns:local="clr-namespace:WpfApp18" 
        mc:Ignorable="d" 
        Title="MainWindow" Height="450" Width="800"> 
    <Window.Resources > 
        <ResourceDictionary > 
            <Style x:Key="dgButton" TargetType="Button" > 
                <Setter Property="FontSize" Value="40"/> 
                <Setter Property="Content" Value="按钮"/> 
                <Setter Property="Foreground" Value="White"/> 
                <Setter Property="Background"> 
                    <Setter.Value> 
                        <!--<RadialGradientBrush> 
                        <GradientStop Color="#FFC564B8" Offset="0"/> 
                        <GradientStop Color="#FFF57A7A" Offset="1"/> 
                    </RadialGradientBrush>--> 
                        <LinearGradientBrush EndPoint="1,1" StartPoint="0,0"> 
                            <GradientStop Color="#FFC564B8" Offset="0"/> 
                            <GradientStop Color="#FFF57A7A" Offset="1"/> 
                        </LinearGradientBrush> 
                    </Setter.Value> 
                </Setter> 
            </Style > 
            <ControlTemplate x:Key="buttonTemplate" TargetType="Button" > 
                <Border BorderThickness="1" CornerRadius="30" Background="{TemplateBinding Background}"> 
                    <ContentPresenter VerticalAlignment="Center" HorizontalAlignment="Center"/> 
                </Border> 
                <!--<Grid > 
                    <Ellipse Name="faceEllipse" Height="50" Width="100" Fill="{TemplateBinding Button.Background}"/> 
                    <TextBlock Name="txtBlock"  /> 
                </Grid >--> 
                <ControlTemplate.Triggers > 
                    <Trigger Property="Button.IsMouseOver" Value="True"> 
                        <Setter Property="Button.Background" Value="blue"/> 
                    </Trigger > 
                </ControlTemplate.Triggers > 
            </ControlTemplate > 
        </ResourceDictionary > 
    </Window.Resources > 
    <Grid> 
        <Button Height="200" HorizontalAlignment="Center" Name="button1" VerticalAlignment="Center" Width="400" Style ="{StaticResource dgButton}" Template="{StaticResource  buttonTemplate}"/> 
    </Grid> 
</Window> 

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