现场优化6

TestingModule/ViewModels/StepsManagerViewModel.cs

@@ -177,10 +177,15 @@ namespace TestingModule.ViewModels
 
         private void SelectionChanged(object parameter)
         {
-            var selectedList = parameter as IList;
-            if (selectedList != null)
+            if (parameter is IList list && list.Count > 0)
             {
-                 SelectedItems = selectedList.Cast<StepVM>().ToList();
+                SelectedItems = list.Cast<StepVM>().ToList();
+            }
+            else if (parameter is IEnumerable enumerable && parameter is not string)
+            {
+                var items = enumerable.Cast<StepVM>().ToList();
+                if (items.Count > 0)
+                    SelectedItems = items;
             }
         }
 
@@ -199,13 +204,19 @@ namespace TestingModule.ViewModels
         }
         private void CopyStep()
         {
-            if (_globalInfo.IsAdmin && SelectedItems.Any())
+            if (!_globalInfo.IsAdmin) return;
+
+            // 优先用多选列表，回退到单选
+            var source = (SelectedItems != null && SelectedItems.Any())
+                ? SelectedItems
+                : (SelectedStep != null ? new List<StepVM> { SelectedStep } : null);
+
+            if (source == null || !source.Any()) return;
+
+            tmpCopyList.Clear();
+            foreach (var item in source)
             {
-                tmpCopyList.Clear();
-                foreach (var item in SelectedItems)
-                {
-                    tmpCopyList.Add(item);
-                }
+                tmpCopyList.Add(item);
             }
         }
         private void PasteStep()
@@ -242,31 +253,29 @@ namespace TestingModule.ViewModels
         }
         private void DeleteStep()
         {
-            // 确保有选中的项
-            if (_globalInfo.IsAdmin && SelectedItems != null && SelectedItems.Any())
+            if (!_globalInfo.IsAdmin) return;
+
+            // 优先用多选列表，回退到单选
+            var source = (SelectedItems != null && SelectedItems.Any())
+                ? SelectedItems.ToList()
+                : (SelectedStep != null ? new List<StepVM> { SelectedStep } : null);
+
+            if (source == null || !source.Any()) return;
+
+            foreach (var item in source)
             {
-                // 创建一个副本进行循环，防止在 Remove 过程中集合变化导致的问题
-                var toDelete = SelectedItems.ToList();
+                _eventAggregator.GetEvent<DeletedStepEvent>().Publish(item.ID);
 
-                foreach (var item in toDelete)
-                {
-                    _eventAggregator.GetEvent<DeletedStepEvent>().Publish(item.ID);
-
-                    if (_ScopedContext.SelectedStepList == "主程序")
-                    {
-                        Program.StepCollection.Remove(item);
-                    }
-                    else if (_ScopedContext.SelectedStepList == "错误程序")
-                    {
-                        Program.ErrorStepCollection.Remove(item);
-                    }
-                }
-
-                // 3. 清空 ViewModel 的选中状态，避免悬挂引用
-                SelectedStep = null;
-                SelectedItems.Clear();
-                _ScopedContext.SelectedStep = null;
+                if (_ScopedContext.SelectedStepList == "主程序")
+                    Program.StepCollection.Remove(item);
+                else if (_ScopedContext.SelectedStepList == "错误程序")
+                    Program.ErrorStepCollection.Remove(item);
             }
+
+            // 清空 ViewModel 的选中状态，避免悬挂引用
+            SelectedStep = null;
+            SelectedItems?.Clear();
+            _ScopedContext.SelectedStep = null;
         }
         #endregion
 
@@ -312,6 +321,7 @@ namespace TestingModule.ViewModels
         /// </summary>
         private void OnSubProgramNavigate(SubProgramNavigatePayload payload)
         {
+            if (_ScopedContext == null || payload == null) return;
             var nav = payload.IsErrorProgram ? _ScopedContext.ErrorNav : _ScopedContext.MainNav;
             if (payload.Action == NavigateAction.Enter && payload.SubProgram != null)
             {
@@ -438,9 +448,9 @@ namespace TestingModule.ViewModels
                     Program.PropertyChanged -= Program_PropertyChanged;
                 }
 
-                // 3. 【核心修复】必须显式退订 Prism 全局事件（AlarmEvent）
-                // 注意：因为订阅时使用的是匿名 Lambda，最安全稳妥的退订方式是把整个事件上的当前 VM 订阅者全部注销
+                // 3. 显式退订全局 Prism 事件
                 _eventAggregator?.GetEvent<AlarmEvent>()?.Unsubscribe(null);
+                _eventAggregator?.GetEvent<SubProgramNavigateEvent>()?.Unsubscribe(null);
 
                 // 4. 清空临时缓存集合与 UI 绑定列表，避免悬挂指针
                 tmpCopyList?.Clear();