《深入浅出WPF》学习笔记七.使用Prism实现点单系统

《深入浅出WPF》学习笔记七.使用Prism实现Mvvm点单系统

背景

深入浅出Wpf系列视频的最后一个demo,使用Prism、Mvvm实现点单系统。demo并不复杂，但是涉及的面广，方便更好的理解wpf。代码在下面自取。后续会把git地址补充上来。

代码

项目层级

command

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Input;namespace RestaurantOrderSystem.Command
{public class RelayCommand : ICommand{private readonly Action<object> _execute;public RelayCommand(Action<object> execute){_execute = execute;}public event EventHandler CanExecuteChanged{add { CommandManager.RequerySuggested += value; }remove { CommandManager.RequerySuggested -= value; }}public bool CanExecute(object parameter) => true;public void Execute(object parameter){_execute(parameter);}}
}

Data

<?xml version="1.0" encoding="utf-8" ?>
<Dishes><Dish><Name>奥尔良烤肉披萨</Name><Category>披萨</Category><Comment>本店推荐</Comment><Score>4.5</Score></Dish><Dish><Name>夏威夷风情披萨</Name><Category>披萨</Category><Comment>本店推荐</Comment><Score>4.6</Score></Dish><Dish><Name>榴莲卷边披萨</Name><Category>披萨</Category><Comment>本店推荐</Comment><Score>4.7</Score></Dish><Dish><Name>韩式烤肉披萨</Name><Category>披萨</Category><Comment>特色</Comment><Score>4.5</Score></Dish><Dish><Name>墨尔本牛排</Name><Category>牛排</Category><Comment>本店推荐</Comment><Score>4.6</Score></Dish><Dish><Name>德克萨斯牛排</Name><Category>牛排</Category><Comment>本店推荐</Comment><Score>4.6</Score></Dish><Dish><Name>纽约香煎牛排</Name><Category>牛排</Category><Comment>本店推荐</Comment><Score>4.6</Score></Dish><Dish><Name>可乐</Name><Category>饮料</Category><Comment>本店推荐</Comment><Score>4.6</Score></Dish><Dish><Name>雪碧</Name><Category>饮料</Category><Comment>本店推荐</Comment><Score>4.6</Score></Dish>
</Dishes>

Models

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;namespace RestaurantOrderSystem.Models
{public class Dish{public string Name { get; set; }public string Category { get; set; }public string Comment { get; set; }public double Score { get; set; }public override string ToString(){return string.Format("{0},{1},{2},{3}", Name, Category, Comment, Score);}}
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;namespace RestaurantOrderSystem.Models
{public class Restaurant{public string Name { get; set; }public string Address { get; set; }public string Phone { get; set; }}
}

Services

using RestaurantOrderSystem.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;namespace RestaurantOrderSystem.Services
{internal interface IDataService{public List<Dish> GetDishes();}
}

using RestaurantOrderSystem.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;namespace RestaurantOrderSystem.Services
{public interface IOrderService{public void PlaceOrder(List<Dish> dishes);}
}

using RestaurantOrderSystem.Models;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;namespace RestaurantOrderSystem.Services
{public class MockOrderService : IOrderService{public void PlaceOrder(List<Dish> dishes){string xmlFile = System.IO.Path.Combine(Environment.CurrentDirectory, @"Data\Order.txt");if (!File.Exists(xmlFile)) { File.Create(xmlFile); }System.IO.File.WriteAllLines(xmlFile, dishes.AsEnumerable().Select(o => o.Name.ToString()).ToArray());}}
}

using RestaurantOrderSystem.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Xml;
using System.Xml.Linq;
using System.Collections.Generic;namespace RestaurantOrderSystem.Services
{internal class XmlDataService : IDataService{public List<Dish> GetDishes(){List<Dish> disheList = new List<Dish>();string xmlFile = System.IO.Path.Combine(Environment.CurrentDirectory, @"Data\Data.xml");XDocument xmlDoc = XDocument.Load(xmlFile);var dishes = xmlDoc.Descendants("Dish");Dish dish = null;foreach (var item in dishes){dish = new Dish();dish.Name = item.Element("Name")?.Value;dish.Category = item.Element("Category")?.Value;dish.Comment = item.Element("Comment")?.Value;dish.Score = Convert.ToDouble(item.Element("Score")?.Value);disheList.Add(dish);}return disheList;}}
}

ViewModels

using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Prism.Mvvm;
using RestaurantOrderSystem.Models;namespace RestaurantOrderSystem.ViewModels
{public class DishMenuItemViewModel :BindableBase{public Dish Dish {  get; set; }private bool isSelected;public bool IsSelected{get { return isSelected; }set { SetProperty(ref isSelected, value); }}}
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using Prism.Mvvm;
using Prism.Regions;
using RestaurantOrderSystem.Command;
using RestaurantOrderSystem.Models;
using RestaurantOrderSystem.Services;namespace RestaurantOrderSystem.ViewModels
{public class OrderViewModel : BindableBase{private int count;public int Count{get { return count; }set{SetProperty(ref count, value);}}private List<DishMenuItemViewModel> menuItem;public List<DishMenuItemViewModel> MenuItem{get { return menuItem; }set{SetProperty(ref menuItem, value);}}private Restaurant myRestaurant;public Restaurant MyRestaurant{get { return myRestaurant; }set{SetProperty(ref myRestaurant, value);}}public OrderViewModel(){orderService = new MockOrderService();xmlDataService = new XmlDataService();LoadRestaurant();LoadMenuData();Count = 0;}private void LoadRestaurant(){Restaurant restaurant = new Restaurant();restaurant.Name = "JokerRestaurant";restaurant.Address = "上海世纪汇";restaurant.Phone = "024-25978888";this.MyRestaurant = restaurant;}private MockOrderService orderService;private XmlDataService xmlDataService;private void LoadMenuData(){List<Dish> dishes = xmlDataService.GetDishes();List<DishMenuItemViewModel> dishMenuList = new List<DishMenuItemViewModel>();foreach (Dish dish in dishes){DishMenuItemViewModel dishMenu = new DishMenuItemViewModel();dishMenu.Dish = dish;dishMenu.IsSelected = false;dishMenuList.Add(dishMenu);}this.MenuItem = dishMenuList;}private RelayCommand placeOrderCommand;public RelayCommand PlaceOrderCommand{get{if (placeOrderCommand == null)placeOrderCommand = new RelayCommand(PlaceOrderCommandExecute);return placeOrderCommand;}set { placeOrderCommand = value; }}private void PlaceOrderCommandExecute(object param){var orderMenu = this.MenuItem.Where(o => o.IsSelected == true).Select(o => o.Dish).ToList();orderService.PlaceOrder(orderMenu);MessageBox.Show("下单成功!");}private RelayCommand selectMenuItemCommand;public RelayCommand SelectMenuItemCommand{get{if (selectMenuItemCommand == null)selectMenuItemCommand = new RelayCommand(SelectMenuItemCommandExecute);return selectMenuItemCommand;}set { selectMenuItemCommand = value; }}private void SelectMenuItemCommandExecute(object param){this.Count = this.MenuItem.Where(o => o.IsSelected == true).Count();}}
}

Views

<Window x:Class="RestaurantOrderSystem.Views.OrderView"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:RestaurantOrderSystem.Views"mc:Ignorable="d" WindowStartupLocation="CenterScreen"Title="{Binding MyRestaurant.Name,StringFormat=\{0\}-在线订餐}" Height="600" Width="1000"><Border BorderBrush="Orange" BorderThickness="3" Background="Yellow" CornerRadius="6"><Grid><Grid.RowDefinitions><RowDefinition Height="Auto"></RowDefinition><RowDefinition Height="*"></RowDefinition><RowDefinition Height="Auto"></RowDefinition></Grid.RowDefinitions><Border BorderBrush="Orange" BorderThickness="1" Background="Yellow" CornerRadius="6" Padding="4" ><StackPanel Grid.Row="0"><StackPanel Orientation="Horizontal"><StackPanel.Effect><DropShadowEffect Color="LightGray"></DropShadowEffect></StackPanel.Effect><TextBlock Text="欢迎光临-" FontSize="60" FontFamily="LiShu"></TextBlock><TextBlock Text="{Binding MyRestaurant.Name}" FontSize="60" FontFamily="LiShu"></TextBlock></StackPanel><StackPanel Orientation="Horizontal"><TextBlock Text="店铺地址-" FontSize="24" FontFamily="LiShu"></TextBlock><TextBlock Text="{Binding MyRestaurant.Address}" FontSize="24" FontFamily="LiShu"></TextBlock></StackPanel><StackPanel Orientation="Horizontal"><TextBlock Text="订餐电话-" FontSize="24" FontFamily="LiShu"></TextBlock><TextBlock Text="{Binding MyRestaurant.Phone}" FontSize="24" FontFamily="LiShu"></TextBlock></StackPanel></StackPanel></Border><DataGrid AutoGenerateColumns="False" CanUserAddRows="False" CanUserDeleteRows="False" ItemsSource="{Binding MenuItem}"Grid.Row="1" Margin="0,4" GridLinesVisibility="None" FontSize="16"><DataGrid.Columns><DataGridTextColumn Header="菜品" Width="120" Binding="{Binding Dish.Name}"></DataGridTextColumn><DataGridTextColumn Header="种类" Width="120" Binding="{Binding Dish.Category}"></DataGridTextColumn><DataGridTextColumn Header="点评" Width="120" Binding="{Binding Dish.Comment}"></DataGridTextColumn><DataGridTextColumn Header="推荐分数" Width="120" Binding="{Binding Dish.Score}"></DataGridTextColumn><DataGridTemplateColumn Header="选中" SortMemberPath="IsSelected" Width="120"><DataGridTemplateColumn.CellTemplate><DataTemplate><CheckBox Width="120" IsChecked="{Binding Path=IsSelected,UpdateSourceTrigger=PropertyChanged}"VerticalAlignment="Center" HorizontalAlignment="Center"Command="{Binding Path=DataContext.SelectMenuItemCommand,RelativeSource={RelativeSource Mode=FindAncestor,AncestorType={x:Type Window}}}"></CheckBox></DataTemplate></DataGridTemplateColumn.CellTemplate></DataGridTemplateColumn></DataGrid.Columns></DataGrid><StackPanel Grid.Row="2" Orientation="Horizontal" HorizontalAlignment="Right" Margin="1"><TextBlock Text="总计" HorizontalAlignment="Center"></TextBlock><TextBox IsEnabled="False" Text="{Binding Count}" Margin="4,0" Width="120"></TextBox><Button x:Name="btnOrder" Command="{Binding PlaceOrderCommand}" Width="120" Content="下单"></Button></StackPanel></Grid></Border>
</Window>

using RestaurantOrderSystem.ViewModels;
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.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;namespace RestaurantOrderSystem.Views
{/// <summary>/// OrderView.xaml 的交互逻辑/// </summary>public partial class OrderView : Window{public OrderView(){InitializeComponent();this.DataContext = new OrderViewModel();}}
}

App.cs

<Application x:Class="RestaurantOrderSystem.App"xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"xmlns:local="clr-namespace:RestaurantOrderSystem"StartupUri="Views/OrderView.xaml"><Application.Resources></Application.Resources>
</Application>