添加项目文件。

Szmedi.RvKits/Drawing/CopyAnnotationViewModel.cs

@@ -0,0 +1,41 @@
+using System.Collections;
+using System.Collections.ObjectModel;
+using System.Linq;
+using System.Windows;
+
+using Autodesk.Revit.DB;
+using Autodesk.Revit.UI;
+
+namespace Szmedi.RvKits.DrawingTools;
+
+public partial class CopyAnnotationViewModel : ObservableObject
+{
+    public CopyAnnotationViewModel(UIApplication uiapp)
+    {
+        var doc = uiapp.ActiveUIDocument.Document;
+        View3Ds = new FilteredElementCollector(doc).OfClass(typeof(View3D)).Cast<View3D>().Where(v => !v.IsTemplate);
+    }
+    [ObservableProperty]
+    private IList<View3D> view3DsSelected;
+
+    [ObservableProperty] private IEnumerable view3Ds;
+
+    [RelayCommand]
+    private void Confirm(object obj)
+    {
+        if (obj is Window window)
+        {
+            if (View3DsSelected is { Count: > 0 })
+            {
+                window.DialogResult = true;
+            }
+        }
+    }
+
+    [RelayCommand]
+    private void SelectionChanged(object obj)
+    {
+        var type = obj.GetType();
+        View3DsSelected = ((ObservableCollection<object>)obj).Cast<View3D>().ToList();
+    }
+}