添加修改轮询时间的功能

ViewModels/Dialogs/PollLevelDialogViewModel.cs

@@ -0,0 +1,22 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using CommunityToolkit.Mvvm.ComponentModel;
+using PMSWPF.Enums;
+
+namespace PMSWPF.ViewModels.Dialogs
+{
+    public partial class PollLevelDialogViewModel : ObservableObject
+    {
+        [ObservableProperty]
+        private PollLevelType _selectedPollLevelType;
+
+        public List<PollLevelType> PollLevelTypes { get; }
+
+        public PollLevelDialogViewModel(PollLevelType currentPollLevelType)
+        {
+            PollLevelTypes = Enum.GetValues(typeof(PollLevelType)).Cast<PollLevelType>().ToList();
+            SelectedPollLevelType = currentPollLevelType;
+        }
+    }
+}