星期

2020年03月23日

.NET CORE(C#) WPF簡單菜單MVVM綁定

2020-03-23 09:53:51 來源:互聯網 閱讀:-

閱讀導航

  1. 本文背景
  2. 代碼實現
  3. 本文參考
  4. 源碼

1. 本文背景

WPF中垂直導航菜單大家應該都常用,本文介紹使用MVVM的方式怎么綁定菜單,真的很簡單。



2. 代碼實現

使用 .Net Core 3.1 創建名為 “MenuMVVM” 的WPF模板項目,添加兩個Nuget庫:MaterialDesignThemes和MaterialDesignColors。

解決方案目錄結構(這次失誤,未截圖,網站可以查看):

2.1 引入MD控件樣式

文件【App.xaml】,在StartupUri中設置啟動的視圖【Views/MainView.xaml】,并在【Application.Resources】節點增加MD控件4個樣式文件

<Application 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">    <Application.Resources>        <ResourceDictionary>            <ResourceDictionary.MergedDictionaries>                <ResourceDictionary Source="pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesignTheme.Dark.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.LightBlue.xaml" />            </ResourceDictionary.MergedDictionaries>        </ResourceDictionary>    </Application.Resources></Application>

2.2 Models

兩個簡單的菜單實體類:

2.2.1 菜單新文件信息

文件【ItemCount.cs】,定義菜單項右側的新文件顯示個數及顯示背景色:

using System.Windows.Media;namespace MenuMVVM.Models{    public class ItemCount    {        public Brush Color { get; private set; }        public int Value { get; private set; }        public ItemCount(Brush color, int value)        {            Color = color;            Value = value;        }    }}

2.2.2 菜單項信息

文件【MenuItem.cs】,定義菜單項展示的名稱、圖片、新文件信息:

using MaterialDesignThemes.Wpf;using System;namespace MenuMVVM.Models{    public class MenuItem    {        public String Name { get; private set; }        public PackIconKind Icon { get; private set; }        public ItemCount Count { get; private set; }        public MenuItem(String name, PackIconKind icon, ItemCount count)        {            Name = name;            Icon = icon;            Count = count;        }    }}

其中菜單項圖標使用MD控件自帶的字體圖標庫,通過枚舉【PackIconKind】可以很方便的使用,該庫提供的字體圖標非常豐富,目前有4836個(枚舉值有7883個), 下面是最后幾個:

//// 摘要://     List of available icons for use with MaterialDesignThemes.Wpf.PackIcon.//// 言論://     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}

2.3 ViewModels

文件【MainViewModel.cs】,只定義了簡單的幾個屬性:窗體展示Logo、菜單綁定列表。屬性定義比較簡單,因為視圖MainView.xaml展示內容不多:

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<MenuItem> LeftMenus { get; set; }        public MainViewModel()        {            Logo = "https://img.dotnet9.com/logo-foot.png";            LeftMenus = new List<MenuItem>();            LeftMenus.Add(new MenuItem("圖片", PackIconKind.Image, new ItemCount(Brushes.Black, 2)));            LeftMenus.Add(new MenuItem("音樂", PackIconKind.Music, new ItemCount(Brushes.DarkBlue, 4)));            LeftMenus.Add(new MenuItem("視頻", PackIconKind.Video, new ItemCount(Brushes.DarkGreen, 7)));            LeftMenus.Add(new MenuItem("文檔", PackIconKind.Folder, new ItemCount(Brushes.DarkOrange, 9)));        }    }}

2.4 Views

文件【MainView.xaml】作為唯一的視圖,只有31行布局代碼,顯示了一個Logo、菜單列表:

<Window 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">    <Grid>        <StackPanel Width="200" HorizontalAlignment="Left" Background="#FF472076">            <Grid Height="150" Background="White">                <Image Source="{Binding Logo}"/>            </Grid>            <ListView ItemsSource="{Binding LeftMenus}">                <ListView.ItemTemplate>                    <DataTemplate>                        <StackPanel Orientation="Horizontal" Height="30">                            <materialDesign:PackIcon Kind="{Binding Path=Icon}" Width="20" Height="20" VerticalAlignment="Center"/>                            <TextBlock Text="{Binding Path=Name}" Margin="20 0" FontSize="15" VerticalAlignment="Center"/>                            <Grid VerticalAlignment="Center">                                <Rectangle Width="30" Height="15" RadiusY="7.15" RadiusX="7.15" Fill="{Binding Path=Count.Color}" Stroke="White" StrokeThickness="0.7"/>                                <TextBlock Text="{Binding Path=Count.Value}" HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="9"/>                            </Grid>                        </StackPanel>                    </DataTemplate>                </ListView.ItemTemplate>            </ListView>        </StackPanel>    </Grid></Window>

文件【MainView.xaml.cs】作為視圖【MainView.xaml】的后臺,綁定ViewModel,并實現鼠標左鍵拖動窗體功能:

using MenuMVVM.ViewModels;using System.Windows;namespace MenuMVVM.Views{    /// <summary>    /// 演示主窗體,只用于簡單的綁定ListView控件    /// </summary>    public partial class MainView : Window    {        public MainView()        {            this.DataContext = new MainViewModel();            InitializeComponent();        }        private void Window_MouseLeftButtonDown(object sender, System.Windows.Input.MouseButtonEventArgs e)        {            DragMove();        }    }}

3.本文參考

  1. 視頻一:C# WPF Design UI: Navigation Drawer Model View View Mode,配套源碼:MenuMVVM。

4.源碼

文中代碼已經全部給出,圖片使用站長網站外鏈,可直接Copy代碼,按解決方案目錄組織代碼文件即可運行,另附原作者視頻及源碼,見【3.本文參考】。

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