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>
鼠标放到按钮上以后按钮呈现蓝色
