在代码中添加引用AcEditor.dll并使用AcEditor.Editor类的方法，以获取AcActDoc.Editor对象，如下所示：

using Autodesk.AutoCAD.EditorInput; using Autodesk.AutoCAD.ApplicationServices; using Autodesk.AutoCAD.DatabaseServices; using Autodesk.AutoCAD.Runtime; using Autodesk.AutoCAD.Geometry; using Autodesk.AutoCAD.Interop;

namespace Example { public class ExampleClass { public void ExampleMethod() { Document doc = Application.DocumentManager.MdiActiveDocument; Database db = doc.Database; Editor editor = doc.Editor;

        AcadApplication acadApp = (AcadApplication)Application.AcadApplication;
        AcadDocument acadDoc = acadApp.ActiveDocument;
        AcadModelSpace acadModelSpace = acadDoc.ModelSpace;

        AcEditor.Editor acEditor = new AcEditor.Editor();
        AcadEntity[] entities = acEditor.SelectAll();

        foreach (AcadEntity entity in entities)
        {
            editor.WriteMessage("\nEntity Type: " + entity.EntityName);
        }
    }
}

}