族：

public static Element GetHostInstance(Document doc, CurveArrArray curveArrs, XYZ faceNormal, double start, double end, bool IsSolid = true)
        {
            Element element = null;
#if Revit2018
            element = doc.FamilyCreate.NewExtrusion(IsSolid,
            curveArrs,
            SketchPlane.Create(doc, Plane.CreateByNormalAndOrigin(faceNormal, new XYZ(start * faceNormal.X, start * faceNormal.Y, start * faceNormal.Z).ConvertToInternalUnits())),
            Math.Abs(end - start).ConvertToInternalUnits());
#elif Revit2019
            element = doc.FamilyCreate.NewExtrusion(IsSolid, curveArrs,
                        SketchPlane.Create(doc, Plane.CreateByNormalAndOrigin(faceNormal, new XYZ(start * faceNormal.X, start * faceNormal.Y, start * faceNormal.Z).ConvertToInternalUnits())),
                        Math.Abs(end - start).ConvertToInternalUnits());
#else
            element = doc.FamilyCreate.NewExtrusion(IsSolid, curveArrs,
            SketchPlane.Create(doc, new Plane(faceNormal, new XYZ(start * faceNormal.X, start * faceNormal.Y, start * faceNormal.Z).ConvertToInternalUnits())),
            Math.Abs(end - start).ConvertToInternalUnits());
#endif
            return element;
        }
        
        public static Extrusion CreateExtrusion(Document doc, CurveArrArray curveArrs, XYZ faceNormal, double start, double end, bool IsSolid = true)
        {
            return GetHostInstance(doc, curveArrs, faceNormal, start, end, IsSolid) as Extrusion;
        }

        public static Blend CreateBlend(Document doc, CurveArray topCurves, CurveArray bottomCurves, XYZ faceNormal, double start, bool IsSolid = true)
        {
            var plane = CreateSketchPlane(doc, faceNormal, start);
            var blend = doc.FamilyCreate.NewBlend(IsSolid, topCurves, bottomCurves, plane);
            return blend;
        }

        public static Sweep CreateSweep(Document doc, CurveArrArray profileArray, XYZ start, XYZ end, bool IsSolid = true)
        {
            XYZ xvec = new XYZ(end.X - start.X, end.Y - start.Y, 0).Normalize();
            XYZ yvec = XYZ.BasisZ;
            start = start.ConvertToInternalUnits();
            end = end.ConvertToInternalUnits();
            var plane = SketchPlane.Create(doc, CreatePlane(xvec, yvec, start));
            SweepProfile profile = doc.Application.Create.NewCurveLoopsProfile(profileArray);

            Curve curve = Line.CreateBound(start, end);
            CurveArray curves = new CurveArray();
            curves.Append(curve);
            return doc.FamilyCreate.NewSweep(IsSolid, curves, plane, profile, 0, ProfilePlaneLocation.Start);
        }

        public static SketchPlane CreateSketchPlane(Document doc, XYZ faceNormal, XYZ origin)
        {
            SketchPlane element = null;
#if Revit2018
           element = SketchPlane.Create(doc, Plane.CreateByNormalAndOrigin(faceNormal, origin));
#elif Revit2019
            element = SketchPlane.Create(doc, Plane.CreateByNormalAndOrigin(faceNormal, origin));
#else
            element = SketchPlane.Create(doc, new Plane(faceNormal, origin));
#endif
            return element;
        }

        public static SketchPlane CreateSketchPlane(Document doc, XYZ faceNormal, double start)
        {
            SketchPlane element = null;
#if Revit2018
           element = SketchPlane.Create(doc, Plane.CreateByNormalAndOrigin(faceNormal, new XYZ(start * faceNormal.X, start * faceNormal.Y, start * faceNormal.Z).ConvertToInternalUnits()));
#elif Revit2019
            element = SketchPlane.Create(doc, Plane.CreateByNormalAndOrigin(faceNormal, new XYZ(start * faceNormal.X, start * faceNormal.Y, start * faceNormal.Z).ConvertToInternalUnits()));
#else
            element = SketchPlane.Create(doc, new Plane(faceNormal, new XYZ(start * faceNormal.X, start * faceNormal.Y, start * faceNormal.Z).ConvertToInternalUnits()));
#endif
            return element;
        }

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