1.创建自定义按钮类 （CustomButton.cs）

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;namespace WPF_LoginUI
{// 自定义按钮类public class CustomButton : Button{// propdp// 依赖属性  CustomButtomStyles.xaml 绑定相关 ButtonCornerRadius 属性 ==> MainWindow.xaml 使用// 自定义属性 圆角半径 public CornerRadius ButtonCornerRadius{get { return (CornerRadius)GetValue(ButtonCornerRadiusProperty); }set { SetValue(ButtonCornerRadiusProperty, value); }}public static readonly DependencyProperty ButtonCornerRadiusProperty =DependencyProperty.Register("ButtonCornerRadius", typeof(CornerRadius), typeof(CustomButton));// 自定义属性 鼠标掠过颜色public Brush BackgroundHover{get { return (Brush)GetValue(BackgroundHoverProperty); }set { SetValue(BackgroundHoverProperty, value); }}public static readonly DependencyProperty BackgroundHoverProperty =DependencyProperty.Register("BackgroundHoverProperty", typeof(Brush), typeof(CustomButton));// 自定义属性 鼠标按下颜色public Brush BackgroundPressed{get { return (Brush)GetValue(BackgroundPressedProperty); }set { SetValue(BackgroundPressedProperty, value); }}public static readonly DependencyProperty BackgroundPressedProperty =DependencyProperty.Register("BackgroundPressed", typeof(Brush), typeof(CustomButton));}
}

2.创建自定义按钮 样式xaml文件（CustomButtomStyles.xaml）

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"         xmlns:bb="clr-namespace:WPF_LoginUI"><!--使用关联的类 --><Style TargetType="{x:Type bb:CustomButton}"><Setter Property="Template"><Setter.Value><!--关联自定义类--><ControlTemplate TargetType="{x:Type bb:CustomButton}"><!-- 外框相关属性 Background 绑定既有属性 CornerRadius 绑定自定义属性--><Border x:Name="buttonBorder" Background="{TemplateBinding Background}" CornerRadius="{TemplateBinding ButtonCornerRadius}"><!-- 中间文本框 绑定按钮自带属性 --><TextBlock Text="{TemplateBinding Content}" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/></Border><!--触发器--><ControlTemplate.Triggers><!-- 触发器 鼠标掠过--><Trigger Property="IsMouseOver" Value="True"><!-- 发生触发 修改Border的背景属性 --><Setter TargetName="buttonBorder" Property="Background" Value="{Binding BackgroundHover, RelativeSource={RelativeSource TemplatedParent}}"></Setter></Trigger><!-- 触发器 鼠标按下--><Trigger Property="IsPressed" Value="True"><!-- 发生触发 修改Border的背景属性 --><Setter TargetName="buttonBorder" Property="Background" Value="{Binding BackgroundPressed, RelativeSource={RelativeSource TemplatedParent}}"></Setter></Trigger></ControlTemplate.Triggers></ControlTemplate></Setter.Value></Setter></Style>
</ResourceDictionary>

3.项目添加样式文件

<Application x:Class="WPF_LoginUI.App"xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"xmlns:local="clr-namespace:WPF_LoginUI"StartupUri="MainWindow.xaml"><Application.Resources><ResourceDictionary><!--添加自定义按钮样式 字典文件--><ResourceDictionary.MergedDictionaries><ResourceDictionary Source="CustomButtomStyles.xaml"/></ResourceDictionary.MergedDictionaries></ResourceDictionary></Application.Resources>
</Application>

4.使用自定义按钮

<!-- 第四行 登录按钮 -->
<local:CustomButton x:Name="BtnLogin" Background="#3C7FF8" Grid.Row="3" Grid.Column="0" Foreground="Wheat" BackgroundHover="red"BackgroundPressed="Green"FontSize="20"ButtonCornerRadius="5"Content="登录" Grid.ColumnSpan="2" HorizontalContentAlignment="Center"VerticalContentAlignment="Center"Command="{Binding LoginAction}"/>