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.NET CORE(C#) WPF 方便的实现用户控件切换（祝大家新年快乐）

快到2020年了，祝大家新年快乐，今年2019最后一更，谢谢大家支持！

阅读导航

本文背景
代码实现
本文参考
源码

1. 本文背景

一个系统主界面，放上一个菜单，点击菜单在客户区切换不同的展示界面，这是很常规的设计，见下面展示效果图：

左侧一个菜单，点击菜单，右侧切换界面，界面切换动画使用MD控件的组件实现（自己使用动画也能实现）。

2. 代码实现

使用 .NET CORE 3.1 创建名为 “MenuChange” 的WPF模板项目，添加1个Nuget库：MaterialDesignThemes，版本为最新预览版3.1.0-ci948。

解决方案主要文件目录组织结构：

AnimatedMenu
- App.xaml
- MainWindow.xaml
  - MainWindow.xaml.cs
- ..[数个演示模块用户控件]

2.1 引入样式

文件【App.xaml】，在 StartupUri 中设置启动的视图【MainWindow.xaml】，并在【Application.Resources】节点增加 MaterialDesignThemes库的样式文件：

<Application.Resources>

    <ResourceDictionary>

        <ResourceDictionary.MergedDictionaries>

            <ResourceDictionary Source="pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesignTheme.Light.xaml" />

            <ResourceDictionary Source="pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesignTheme.Defaults.xaml" />

            <ResourceDictionary Source="pack://application:,,,/MaterialDesignColors;component/Themes/Recommended/Primary/MaterialDesignColor.Blue.xaml" />

            <ResourceDictionary Source="pack://application:,,,/MaterialDesignColors;component/Themes/Recommended/Accent/MaterialDesignColor.Indigo.xaml" />

        </ResourceDictionary.MergedDictionaries>

    </ResourceDictionary>

</Application.Resources>

2.2 演示窗体

文件【MainWindow.xaml】，布局代码、动画代码都在此文件中，源码如下：

<Window x:Class="MenuChange.MainWindow"

        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

        xmlns:materialDesign="http://materialdesigninxaml.net/winfx/xaml/themes"

        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"

        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"

        mc:Ignorable="d"

        Height="600" Width="1024" WindowStartupLocation="CenterScreen" ResizeMode="NoResize" WindowStyle="None" >

    <Grid Background="#FFEEEEEE" MouseDown="Grid_MouseDown">

        <StackPanel VerticalAlignment="Top">

            <Grid Background="#FF0069C0" Height="10"/>

            <Grid Margin="5">

                <StackPanel HorizontalAlignment="Center" Orientation="Horizontal">

                    <TextBlock Text="Dotnet9.com" VerticalAlignment="Center" FontSize="20" FontFamily="Champagne &amp; Limousines" Margin="20 0"/>

                    <Button Width="30" Height="30" Background="{x:Null}" BorderBrush="{x:Null}" Padding="0" Foreground="Gray">

                        <materialDesign:PackIcon Kind="Wechat"/>

                    </Button>

                    <Button Width="30" Height="30" Background="{x:Null}" BorderBrush="{x:Null}" Padding="0" Foreground="Gray">

                        <materialDesign:PackIcon Kind="Qqchat"/>

                    </Button>

                    <Button Width="30" Height="30" Background="{x:Null}" BorderBrush="{x:Null}" Padding="0" Foreground="Gray">

                        <materialDesign:PackIcon Kind="GithubBox"/>

                    </Button>

                </StackPanel>

                <StackPanel Orientation="Horizontal" HorizontalAlignment="Right" Margin="10 0">

                    <Button Width="30" Height="30" Background="{x:Null}" BorderBrush="{x:Null}" Padding="0" Foreground="Gray">

                        <materialDesign:PackIcon Kind="BellOutline"/>

                    </Button>

                    <Button Width="30" Height="30" Background="{x:Null}" BorderBrush="{x:Null}" Padding="0" Foreground="Gray" Margin="0 0 10 0">

                        <materialDesign:PackIcon Kind="Settings"/>

                    </Button>

                    <Button x:Name="ButtonFechar" Width="30" Height="30" Background="{x:Null}" BorderBrush="{x:Null}" Padding="0" Foreground="Gray" Click="ButtonFechar_Click">

                        <materialDesign:PackIcon Kind="Close"/>

                    </Button>

                </StackPanel>

            </Grid>

        </StackPanel>

        <Grid Margin="250 55 0 0">

            <Grid x:Name="GridPrincipal" HorizontalAlignment="Center" VerticalAlignment="Center"/>

        </Grid>

        <Grid Width="250" HorizontalAlignment="Left" Background="#FF222222">

            <materialDesign:TransitioningContent x:Name="TrainsitionigContentSlide" OpeningEffect="{materialDesign:TransitionEffect SlideInFromLeft, Duration=0:0:0.2}">

                <Grid x:Name="GridCursor" Margin="0 100 0 0" Background="#FF0069C0" Width="10" HorizontalAlignment="Left" Height="60" VerticalAlignment="Top"/>

            </materialDesign:TransitioningContent>

            <Image Source="https://img.dotnet9.com/logo-head.png" VerticalAlignment="Top"/>

            <Image Source="https://img.dotnet9.com/logo-foot.png" VerticalAlignment="Bottom"/>

            <ListView x:Name="ListViewMenu" Margin="0 100" Foreground="LightGray" FontFamily="Champagne &amp; Limousines" FontSize="18" SelectionChanged="ListViewMenu_SelectionChanged" SelectedIndex="0">

                <ListViewItem Height="60">

                    <StackPanel Orientation="Horizontal">

                        <materialDesign:PackIcon Kind="Home" Width="30" Height="30" VerticalAlignment="Center" Margin="5"/>

                        <TextBlock Text="首页" FontSize="17" VerticalAlignment="Center" Margin="20 0"/>

                    </StackPanel>

                </ListViewItem>

                <ListViewItem Height="60">

                    <StackPanel Orientation="Horizontal">

                        <materialDesign:PackIcon Kind="LanguageCsharp" Width="30" Height="30" VerticalAlignment="Center" Margin="5"/>

                        <TextBlock Text="WPF" FontSize="17" VerticalAlignment="Center" Margin="20 0"/>

                    </StackPanel>

                </ListViewItem>

                <ListViewItem Height="60">

                    <StackPanel Orientation="Horizontal">

                        <materialDesign:PackIcon Kind="LanguageCsharp" Width="30" Height="30" VerticalAlignment="Center" Margin="5"/>

                        <TextBlock Text="Winform" FontSize="17" VerticalAlignment="Center" Margin="20 0"/>

                    </StackPanel>

                </ListViewItem>

                <ListViewItem Height="60">

                    <StackPanel Orientation="Horizontal">

                        <materialDesign:PackIcon Kind="LanguageCsharp" Width="30" Height="30" VerticalAlignment="Center" Margin="5"/>

                        <TextBlock Text="ASP.NET CORE" FontSize="17" VerticalAlignment="Center" Margin="20 0"/>

                    </StackPanel>

                </ListViewItem>

                <ListViewItem Height="60">

                    <StackPanel Orientation="Horizontal">

                        <materialDesign:PackIcon Kind="LanguageCsharp" Width="30" Height="30" VerticalAlignment="Center" Margin="5"/>

                        <TextBlock Text="Xamarin.Forms" FontSize="17" VerticalAlignment="Center" Margin="20 0"/>

                    </StackPanel>

                </ListViewItem>

                <ListViewItem Height="60">

                    <StackPanel Orientation="Horizontal">

                        <materialDesign:PackIcon Kind="LanguageCpp" Width="30" Height="30" VerticalAlignment="Center" Margin="5"/>

                        <TextBlock Text="C++" FontSize="17" VerticalAlignment="Center" Margin="20 0"/>

                    </StackPanel>

                </ListViewItem>

            </ListView>

        </Grid>

    </Grid>

</Window>

简单说明下：

"GridPrincipal" 作为客户区子模块界面容器，展示新界面时，先移除旧用户控件，再添加新用户控件（站长以前使用时，是遍历容器中所有用户界面，对非选择用户控件作隐藏操作，然后添加新用户控件或者对已存在的被选择用户控件作显示操作）。
左侧菜单项使用 "ListView" 进行布局，实际开发需要运用模板，使用MVVM做成动态菜单，方便扩展。
右侧切换的子模块界面应该使用Prism或者其他框架（自已实现的模块dll）实现的子界面，方便动态扩展（需要和左侧菜单项进行关联）。

文件【MainWindow.xaml.cs】，后台关闭窗体、菜单点击切换子模块界面、窗体移动等事件处理：

using System.Windows;

using System.Windows.Controls;

using System.Windows.Input;

namespace MenuChange

{

    /// <summary>

    /// Interaction logic for MainWindow.xaml

    /// </summary>

    public partial class MainWindow : Window

    {

        public MainWindow()

        {

            InitializeComponent();

        }

        private void ButtonFechar_Click(object sender, RoutedEventArgs e)

        {

            Application.Current.Shutdown();

        }

        private void Grid_MouseDown(object sender, MouseButtonEventArgs e)

        {

            DragMove();

        }

        private void ListViewMenu_SelectionChanged(object sender, SelectionChangedEventArgs e)

        {

            int index = ListViewMenu.SelectedIndex;

            MoveCursorMenu(index);

            switch (index)

            {

                case 0:

                    GridPrincipal.Children.Clear();

                    GridPrincipal.Children.Add(new UserControlMain());

                    break;

                case 1:

                    GridPrincipal.Children.Clear();

                    GridPrincipal.Children.Add(new UserControlWPF());

                    break;

                case 2:

                    GridPrincipal.Children.Clear();

                    GridPrincipal.Children.Add(new UserControlWinform());

                    break;

                case 3:

                    GridPrincipal.Children.Clear();

                    GridPrincipal.Children.Add(new UserControlASPNETCORE());

                    break;

                case 4:

                    GridPrincipal.Children.Clear();

                    GridPrincipal.Children.Add(new UserControlXamarinForms());

                    break;

                case 5:

                    GridPrincipal.Children.Clear();

                    GridPrincipal.Children.Add(new UserControlCPP());

                    break;

                default:

                    break;

            }

        }

        private void MoveCursorMenu(int index)

        {

            TrainsitionigContentSlide.OnApplyTemplate();

            GridCursor.Margin = new Thickness(0, (100 + (60 * index)), 0, 0);

        }

    }

}

方便演示，点击菜单，切换子用户控件时时写死的，见上面的说明，左侧菜单及右侧切换的子用户控件需要进行关联配置，方便扩展，建议使用Prism的模块化开发。

2.3 演示主模块

文件【UserControlMain.xaml】，只展示其中一个子模块用户控件吧，其他类似，文末有源码、可运行Demo供下载参考。

注意： 需要使用MD控件的 TransitioningContent 组件将用户控件可视区域包裹起来，用于使用MD的移动切换动画，其中 OpeningEffect 见名思意，即是展示此用户控件时，动画如何播放，见下面代码，SlideInFromLeft 是指示展示时由左向右缓动，相反 SlideInFromRight即是由右向左缓动，其他属性可查阅MD官网或者Demo研究。

<UserControl x:Class="MenuChange.UserControlMain"

             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

             xmlns:materialDesign="http://materialdesigninxaml.net/winfx/xaml/themes"

             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"

             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"

             mc:Ignorable="d"

             Height="auto" Width="auto">

    <Grid>

        <materialDesign:TransitioningContent x:Name="TrainsitionigContentSlide" OpeningEffect="{materialDesign:TransitionEffect SlideInFromLeft, Duration=0:0:0.8}">

            <StackPanel Background="#33ff0000">

                <TextBox HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="30" Foreground="White" Text="https://dotnet9.com"/>

                <Image Source="https://img.dotnet9.com/20200124165746.png"/>

            </StackPanel>

        </materialDesign:TransitioningContent>

    </Grid>

</UserControl>

已奉上关键代码，全部代码文末有下载链接...

3.本文参考

视频一：C# WPF Material Design UI: Fast Food Sales，配套源码：Pizzaria1。
C# WPF开源控件库《MaterialDesignInXAML》

4.源码

站长方便演示，文中的图片使用的本站外链图片：

演示Demo下载

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