.NET CORE(C#) WPF简单菜单MVVM绑定

阅读导航

1. 本文背景

WPF中垂直导航菜单大家应该都常用，本文介绍使用MVVM的方式怎么绑定菜单，真的很简单。

2. 代码实现

使用 .Net Core 3.1 创建名为 “MenuMVVM” 的WPF模板项目，添加两个Nuget库：MaterialDesignThemes和MaterialDesignColors。

MaterialDesign控件库

解决方案目录结构：

MenuMVVM

Views

MainView.xaml

MainView.xaml.cs

ViewModels

MainViewModel.cs

Modles

ItemCount.cs

MenuItem.cs

App.xaml

文件【App.xaml】，在StartupUri中设置启动的视图【Views/MainView.xaml】，并在【Application.Resources】节点增加MD控件4个样式文件

x:Class="MenuMVVM.App"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
StartupUri="Views/MainView.xaml">
>
>
>
Source="pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesignTheme.Dark.xaml" />
Source="pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesignTheme.Defaults.xaml" />
Source="pack://application:,,,/MaterialDesignColors;component/Themes/Recommended/Primary/MaterialDesignColor.Blue.xaml" />
Source="pack://application:,,,/MaterialDesignColors;component/Themes/Recommended/Accent/MaterialDesignColor.LightBlue.xaml" />

两个简单的菜单实体类：

2.2.1 菜单新文件信息

文件【ItemCount.cs】，定义菜单项右侧的新文件显示个数及显示背景色：

2.2.2 菜单项信息

文件【MenuItem.cs】，定义菜单项展示的名称、图片、新文件信息：

其中菜单项图标使用MD控件自带的字体图标库，通过枚举【PackIconKind】可以很方便的使用，该库提供的字体图标非常丰富，目前有4836个（枚举值有7883个），下面是最后几个：

//
// 摘要:
// List of available icons for use with MaterialDesignThemes.Wpf.PackIcon.
//
// 言论：
// All icons sourced from Material Design Icons Font - https://materialdesignicons.com/
// - in accordance of https://github.com/Templarian/MaterialDesign/blob/master/license.txt.
public enum PackIconKind
{
.
.
.
ZodiacPisces = 4832,
HoroscopePisces = 4832,
ZodiacSagittarius = 4833,
HoroscopeSagittarius = 4833,
ZodiacScorpio = 4834,
HoroscopeScorpio = 4834,
ZodiacTaurus = 4835,
HoroscopeTaurus = 4835,
ZodiacVirgo = 4836,
HoroscopeVirgo = 4836
}

文件【MainViewModel.cs】，只定义了简单的几个属性：窗体展示Logo、菜单绑定列表。属性定义比较简单，因为视图MainView.xaml展示内容不多：

using MaterialDesignThemes.Wpf;
using MenuMVVM.Models;
using System.Collections.Generic;
using System.Windows.Media;
namespace MenuMVVM.ViewModels
{
public class MainViewModel
{
public string Logo { get; set; }
public List LeftMenus { get; set; }
public MainViewModel()
{
Logo = "https://img.dotnet9.com/logo-foot.png";
LeftMenus = new List();
LeftMenus.Add(new MenuItem("图片", PackIconKind.Image, new ItemCount(Brushes.Black, 2)));
LeftMenus.Add(new MenuItem("音乐", PackIconKind.Music, new ItemCount(Brushes.DarkBlue, 4)));
LeftMenus.Add(new MenuItem("视频", PackIconKind.Video, new ItemCount(Brushes.DarkGreen, 7)));
LeftMenus.Add(new MenuItem("文档", PackIconKind.Folder, new ItemCount(Brushes.DarkOrange, 9)));
}
}
}

文件【MainView.xaml】作为唯一的视图，只有31行布局代码，显示了一个Logo、菜单列表：

x:Class="MenuMVVM.Views.MainView"
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"
Title="Dotnet9" Height="600" Width="1080" Background="#FF36235F" MouseLeftButtonDown="Window_MouseLeftButtonDown"
WindowStyle="None" ResizeMode="NoResize" WindowStartupLocation="CenterScreen">
>
Width="200" HorizontalAlignment="Left" Background="#FF472076">
Height="150" Background="White">
Source="{Binding Logo}"/>
ItemsSource="{Binding LeftMenus}">
>
>
Orientation="Horizontal" Height="30">
Kind="{Binding Path=Icon}" Width="20" Height="20" VerticalAlignment="Center"/>
Text="{Binding Path=Name}" Margin="20 0" FontSize="15" VerticalAlignment="Center"/>
VerticalAlignment="Center">
Width="30" Height="15" RadiusY="7.15" RadiusX="7.15" Fill="{Binding Path=Count.Color}" Stroke="White" StrokeThickness="0.7"/>
Text="{Binding Path=Count.Value}" HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="9"/>

文件【MainView.xaml.cs】作为视图【MainView.xaml】的后台，绑定ViewModel,并实现鼠标左键拖动窗体功能：

using MenuMVVM.ViewModels;
using System.Windows;
namespace MenuMVVM.Views
{
///
/// 演示主窗体，只用于简单的绑定ListView控件
///
public partial class MainView : Window
{
public MainView()
{
this.DataContext = new MainViewModel();
InitializeComponent();
}
private void Window_MouseLeftButtonDown(object sender, System.Windows.Input.MouseButtonEventArgs e)
{
DragMove();
}
}
}