MainWindowViewModel.cs

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using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using CommunityToolkit.Mvvm.Messaging;
using MyApp.Services;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Input;

namespace MyApp
{
    public class MainWindowViewModel : ObservableRecipient
    {
        private string totalCost = "-.--";

        public string TotalCost
        {
            get => totalCost;
            set => SetProperty(ref totalCost, value);
        }

        private Restaurant restaurant;
        public Restaurant Restaurant
        {
            get => restaurant;
            set => SetProperty(ref restaurant, value);
        }

        private List<CustomerOrderItemViewModel> dishMenu;
        public List<CustomerOrderItemViewModel> DishMenu
        {
            get => dishMenu;
            set => SetProperty(ref dishMenu, value);
        }

        private void LoadDishMenu()
        {
            List<Dish> dishes = dataService.FindAllDishes();
            DishMenu = new List<CustomerOrderItemViewModel>();
            int i = 1;
            foreach (Dish dish in dishes)
            {
                CustomerOrderItemViewModel item = new CustomerOrderItemViewModel
                {
                    Dish = dish,
                    RowSerialNum = i
                };
                DishMenu.Add(item);
                i += 1;
            }
        }

        private void LoadRestaurant()
        {
            Restaurant = new Restaurant
            {
                Name = "Crazy大象旗舰店",
                Address = "北京市朝阳区xxx路xxx号",
                PhoneNumber = "010-1314520"
            };