创建了PLC相关的文件

ViewModels/MainViewModel.cs

@@ -1,13 +1,16 @@
 using CommunityToolkit.Mvvm.ComponentModel;
 using CommunityToolkit.Mvvm.Messaging;
+using PMSWPF.Data.Entities;
 using PMSWPF.Message;
+using System.Collections.ObjectModel;
 
 namespace PMSWPF.ViewModels
 {
     partial class MainViewModel : ObservableRecipient, IRecipient<MyMessage>
     {
+       
         public MainViewModel()
-        {
+        { 
             IsActive = true;
         }
 

ViewModels/PlcListViewModel.cs

@@ -0,0 +1,17 @@
+using CommunityToolkit.Mvvm.ComponentModel;
+using PMSWPF.Data.Entities;
+using System.Collections.ObjectModel;
+
+namespace PMSWPF.ViewModels
+{
+    public partial class PlcListViewModel : ObservableRecipient
+    {
+        [ObservableProperty]
+        private ObservableCollection<PLC> plcList;
+        public PlcListViewModel()
+        {
+            plcList = new ObservableCollection<PLC>();
+        
+        }
+    }
+}