优化了Workbench上的操作。

Workbench/ViewModels/ViewNodeInfoViewModel.cs

@@ -0,0 +1,46 @@
+using CommunityToolkit.Mvvm.ComponentModel;
+using Serein.Library;
+using Serein.Workbench.Node.View;
+using Serein.Workbench.Services;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Serein.Workbench.ViewModels
+{
+    internal partial class ViewNodeInfoViewModel : ObservableObject
+    {
+        private readonly FlowNodeService flowNodeService;
+
+        /// <summary>
+        /// 当前预览的节点
+        /// </summary>
+        [ObservableProperty]
+        private NodeModelBase viewNodeModel;
+
+        public ViewNodeInfoViewModel(FlowNodeService flowNodeService)
+        {
+            this.flowNodeService = flowNodeService;
+            InitEvent();
+        }
+
+        private void InitEvent()
+        {
+            flowNodeService.OnViewNodeControlChanged += OnViewNodeControlChanged;
+        }
+        private void OnViewNodeControlChanged(NodeControlBase viewNodeControl)
+        {
+            if(viewNodeControl is null)
+            {
+                ViewNodeModel = null;
+            }
+            else
+            {
+                ViewNodeModel = viewNodeControl.ViewModel.NodeModel;
+            }
+
+        }
+    }
+}