LPLocalhostMES/LocalhostMES/ViewModels/MainViewModel.cs

using LocalhostMES.DataBase;
using LocalhostMES.ViewModels.Services;
using Prism.Commands;
using Prism.Mvvm;
using System.ComponentModel;
namespace LocalhostMES.ViewModels
{
    /// <summary>
    /// 主窗口壳：初始化/释放共享会话与 Web API 宿主。
    /// </summary>
    public class MainViewModel : BindableBase
    {
        private readonly IMesWorkspace _workspace;

        public MainViewModel(IMesWorkspace workspace)
        {
            _workspace = workspace;
            LoadedCommand = new DelegateCommand(OnLoaded);
            ClosedCommand = new DelegateCommand(OnClosed);
            if (_workspace is INotifyPropertyChanged npc)
            {
                npc.PropertyChanged += OnWorkspacePropertyChanged;
            }
        }

        public DelegateCommand LoadedCommand { get; }

        public DelegateCommand ClosedCommand { get; }

        public int SelectedTabIndex
        {
            get => _workspace.SelectedTabIndex;
            set
            {
                if (_workspace.SelectedTabIndex == value)
                {
                    return;
                }

                _workspace.SelectedTabIndex = value;
                RaisePropertyChanged();
            }
        }

        private void OnLoaded()
        {
            _workspace.Initialize();
        }

        private async void OnClosed()
        {
            _workspace.Shutdown();
            try
            {
                var svc = _workspace.MesManagement.WebApiService;
                if (svc?.IsRunning == true)
                {
                    await svc.StopAsync();
                }
            }
            catch
            {
                // 忽略关闭时异常
            }
        }

        private void OnWorkspacePropertyChanged(object sender, PropertyChangedEventArgs e)
        {
            if (e.PropertyName == nameof(IMesWorkspace.SelectedTabIndex))
            {
                RaisePropertyChanged(nameof(SelectedTabIndex));
            }
        }
    }
}