创建了Sheet，并将设计成果参考进来，如何只显示图框内的内容

这里是编程论坛，您是要问编程实现还是手工操作实现？

[MSCE C#]如何在程序中实现？

您需要的这个功能在MS中叫做参考的剪切。可以先获取图框范围坐标点，然后调用DgnAttachment下的SetClipPoints

好的，我试试，谢谢符老师！

研究了一段时间，总算搞清楚了，裁剪的坐标是需要根据RefOrigin来设置的。感谢符老师，以下代码亲测通过，供大家参考。

DgnDocumentMoniker moniker = DgnDocumentMoniker.CreateFromFileName(dgnFile.GetFileName(), null);
            DgnAttachment attachment = sheetDgnModel.CreateDgnAttachment(moniker, DRAWING_NAME);

            double x0, y0, x1, y1;
            if (attachment != null)
            {
                attachment.StoredScale = 1 / SheetScale;
                DTransform3d transform = DTransform3d.FromTranslation(new DPoint3d(centerPoint.X, centerPoint.Y, 0.0) * uor);//3、再平移回去
                transform = transform * DTransform3d.Rotation(2, Angle.FromRadians(centerVector.Azimuth > Math.PI ? -Math.PI * 3 / 2 + centerVector.Azimuth : -Math.PI / 2 + centerVector.Azimuth));//2、再旋转
                transform = transform * DTransform3d.FromTranslation(new DPoint3d(-centerPoint.X, -centerPoint.Y, 0.0) * uor);//1、先平移到图纸中心

                //旋转和平移绘图到图纸指定位置
                attachment.SetMasterOrigin(new DPoint3d(blockWidth / 2 + sheetMargin, blockHeight / 2 + sheetMargin, 0.0) * uor);
                attachment.SetRefOrigin(new DPoint3d(centerPoint.X, centerPoint.Y, 0.0) * uor);
                DMatrix3d rotateMatrix = transform.Matrix;
                attachment.SetRotMatrix(rotateMatrix);

                //设置裁剪区，此中心是以RefOrigin为原点的范围
                x0 = -blockWidth / 2;
                y0 = -blockHeight / 2;
                x1 = x0 + blockWidth;
                y1 = y0 + blockHeight;
                DPoint2d[] clipPoints = new DPoint2d[] {
                    new DPoint2d(x0, y0) * uor,
                    new DPoint2d(x1, y0) * uor,
                    new DPoint2d(x1, y1) * uor,
                    new DPoint2d(x0, y1) * uor};
                attachment.SetClipPoints(clipPoints);
                attachment.Rewrite(true, true);
                attachment.WriteToModel(true);
            }