Cad 二次开发关于SelectCrossingPolygon和SelectFence返回结果Status为error的小测试

　　CAD2008的二次开发，有个很奇怪的现象，只要你选择的点集不在当前视图上SelectCrossingPolygon和SelectFence返回结果Status就会为error,所以要获取正确的结果，在操作前最好全屏缩放一下！

　　小测试：

        [CommandMethod("TestPromptSelectionResult")]
        public void TestPromptSelectionResult()
        {
            Point3dCollection pt3dCol = new Point3dCollection();
            pt3dCol.Add(new Point3d(486750, 2538400, 0));
            pt3dCol.Add(new Point3d(487000, 2538400, 0));
            pt3dCol.Add(new Point3d(487000, 2538600, 0));
            pt3dCol.Add(new Point3d(486750, 2538600, 0));
            pt3dCol.Add(new Point3d(486750, 2538400, 0));
            Document doc =  Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument;
            PromptSelectionResult psrss = doc.Editor.SelectFence(pt3dCol);
            //if (psrss.Status != PromptStatus.OK)
                MessageBox.Show(psrss.Status.ToString());
            Polyline pl = new Polyline();
            for (int i = 0; i < pt3dCol.Count; i++)
            {
                //添加多段线的顶点
                pl.AddVertexAt(i, new Point2d(pt3dCol[i].X, pt3dCol[i].Y), 0, 0, 0);
            }
            CadDatabase.AppendToModelSpace(pl, doc.Database);
        }

最后你只要看到那个多段线，再打入命令TestPromptSelectionResult就会返回OK,个人认为是c#Cad二次开发的一下Bug,求大神打我脸!