1，重新梳理了代码，将使用多线程，并实现了批量读取变量

2，添加OpcUa更新方式的修改对话框
3，修复了一些已知的Bug
4，删除了不必要的函数

ViewModels/DevicesViewModel.cs

@@ -52,13 +52,20 @@ public partial class DevicesViewModel : ViewModelBase
         _dialogService = dialogService;
         _dataServices = dataServices;
 
-        MessageHelper.SendLoadMessage(LoadTypes.Devices);
-        _dataServices.OnDeviceListChanged += (sender, devices) =>
+        _dataServices.OnDeviceListChanged += (devices) =>
         {
             Devices = new ObservableCollection<Device>(devices);
         };
     }
 
+    public override void OnLoaded()
+    {
+        if (_dataServices.Devices!=null && _dataServices.Devices.Count>0)
+        {
+            Devices=new ObservableCollection<Device>(_dataServices.Devices);
+        }
+    }
+
     /// <summary>
     /// 添加设备命令。
     /// </summary>