消除所有错误，重新构建

DMS.WPF/ViewModels/Items/VariableHistoryItemViewModel.cs

@@ -0,0 +1,27 @@
+using CommunityToolkit.Mvvm.ComponentModel;
+using DMS.Application.DTOs;
+using System;
+
+namespace DMS.WPF.ViewModels.Items;
+
+public partial class VariableHistoryItemViewModel : ObservableObject
+{
+    public long Id { get; }
+
+    [ObservableProperty]
+    private int _variableId;
+
+    [ObservableProperty]
+    private string _value;
+
+    [ObservableProperty]
+    private DateTime _timestamp;
+
+    public VariableHistoryItemViewModel(VariableHistoryDto dto)
+    {
+        Id = dto.Id;
+        _variableId = dto.VariableId;
+        _value = dto.Value;
+        _timestamp = dto.Timestamp;
+    }
+}