Synchronize the Net40

Net40/HandyControlDemo_Net40/ViewModel/Main/MainViewModel.cs

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+using System;
+using System.Collections.Generic;
+using System.Windows.Controls;
+using GalaSoft.MvvmLight;
+using GalaSoft.MvvmLight.Command;
+using GalaSoft.MvvmLight.Messaging;
+using HandyControlDemo.Data;
+using HandyControlDemo.Service;
+using HandyControlDemo.Tools;
+
+namespace HandyControlDemo.ViewModel
+{
+    public class MainViewModel : ViewModelBase
+    {
+        #region 字段
+
+        /// <summary>
+        ///     内容标题
+        /// </summary>
+        private object _contentTitle;
+
+        /// <summary>
+        ///     子内容
+        /// </summary>
+        private object _subContent;
+
+        /// <summary>
+        ///     数据列表
+        /// </summary>
+        private List<DemoDataModel> _dataList;
+
+        /// <summary>
+        ///     当前选中的列表项
+        /// </summary>
+        private ListBoxItem _listBoxItemCurrent;
+
+        #endregion
+
+        public MainViewModel(DataService dataService)
+        {
+            Messenger.Default.Register<object>(this, MessageToken.LoadShowContent, obj =>
+            {
+                if (SubContent is IDisposable disposable)
+                {
+                    disposable.Dispose();
+                }
+                SubContent = obj;
+            });
+            Messenger.Default.Register<object>(this, MessageToken.ClearLeftSelected, obj =>
+            {
+                if (_listBoxItemCurrent == null) return;
+                _listBoxItemCurrent.IsSelected = false;
+                _listBoxItemCurrent = null;
+            });
+            DataList = dataService.GetDemoDataList();
+        }
+
+        #region 属性
+
+        /// <summary>
+        ///     数据列表
+        /// </summary>
+        public List<DemoDataModel> DataList
+        {
+            get => _dataList;
+            set => Set(nameof(DataList), ref _dataList, value);
+        }
+
+        /// <summary>
+        ///     子内容
+        /// </summary>
+        public object SubContent
+        {
+            get => _subContent;
+            set => Set(nameof(SubContent), ref _subContent, value);
+        }
+
+        /// <summary>
+        ///     内容标题
+        /// </summary>
+        public object ContentTitle
+        {
+            get => _contentTitle;
+            set => Set(nameof(ContentTitle), ref _contentTitle, value);
+        }
+
+        #endregion
+
+        #region 命令
+
+        private RelayCommand<SelectionChangedEventArgs> _switchDemoCmd;
+
+        /// <summary>
+        ///     切换例子命令
+        /// </summary>
+        public RelayCommand<SelectionChangedEventArgs> SwitchDemoCmd =>
+            _switchDemoCmd ?? (_switchDemoCmd = new RelayCommand<SelectionChangedEventArgs>(SwitchDemo));
+
+        #endregion
+
+        #region 方法
+
+        /// <summary>
+        ///     切换例子
+        /// </summary>
+        private void SwitchDemo(SelectionChangedEventArgs e)
+        {
+            if (e.AddedItems.Count == 0) return;
+            if (e.AddedItems[0] is ListBoxItem item)
+            {
+                if (item.Tag is string tag)
+                {
+                    if (Equals(_listBoxItemCurrent, item)) return;
+                    _listBoxItemCurrent = item;
+                    ContentTitle = item.Content;
+                    Messenger.Default.Send(false, MessageToken.FullSwitch);
+                    Messenger.Default.Send(AssemblyHelper.CreateInternalInstance($"UserControl.{tag}"), MessageToken.LoadShowContent);
+                }
+                else
+                {
+                    _listBoxItemCurrent = null;
+                    ContentTitle = null;
+                    SubContent = null;
+                }
+            }
+        }
+
+        #endregion
+    }
+}