[MSCE]BooleanIntersect问题

            Element a= Extrusion(7.2 * UorPerMas, 3.8 * UorPerMas, 0.4 * UorPerMas, 0.4 * UorPerMas, 1 * UorPerMas) ;
            Element b = Extrusion(7.0 * UorPerMas, 3.6 * UorPerMas, 0 * UorPerMas, 0.3 * UorPerMas, 1 * UorPerMas);
            SolidKernelEntity entityOut1 = null;
            SolidKernelEntity entityOut2 = null;
            Convert1.ElementToBody(out entityOut1, a, true, true, true);
            Convert1.ElementToBody(out entityOut2, b, true, true, true);
            SolidKernelEntity[] solidKerEnti = new SolidKernelEntity[1];
            solidKerEnti[0] = entityOut2;
            if(BentleyStatus.Success == Modify.BooleanIntersect(ref entityOut1, ref solidKerEnti, 1))
            {
                MessageBox.Show("boolean OK");
            }
            Element eleResult;
            Convert1.BodyToElement(out eleResult, entityOut1, null, Session.Instance.GetActiveDgnModelRef());
            eleResult.AddToModel();

Extrusion函数创建了两个如图所示的大小不等的体，通过BooleanIntersect想要得到如图的体布尔运算返回success，但是最后返回的结果是没有做过布尔运算，请问是为什么