C# NX二次开发：在多个体的模型中如何实现拉伸操作布尔减

大家好，今天接着上一篇拉伸文章去讲。

UF_MODL_create_extruded1 (view source)

uf_list_p_t	objects	Input	List of objects to be extruded.
char *	taper_angle	Input	Taper angle (in degrees).
char *	limit [ 2 ]	Input	Limit of extrusion. This is declared as: char limit[2]. The first value is the start value of the extrusion and the second value is the end of the extrusion (see the example program).
double	point [ 3 ]	Input	not used
double	direction [ 3 ]	Input	Extrusion axis.
UF_FEATURE_SIGN	sign	Input	The sign of the operation to be performed. UF_NULLSIGN = create new target solid UF_POSITIVE = add to target solid UF_NEGATIVE = subtract from target solid UF_UNSIGNED = intersect with target solid
tag_t	target_body	Input	Target body to perform Boolean
uf_list_p_t *	features	Output to UF_*free*	List of feature identifiers created. This list must be freed by calling UF_MODL_delete_list.

可能大家也注意到了这里面多了一个传入目标体的参数，这个时候大家可能以为这就是解决了上面所说的那个问题了，我当时也是这样认为的，可到了使用的时候才知道，你传入的Tag值也不起作用，这个API是有问题的。

上一篇文章讲到这有问题的，现在来讲如果想要实现标题中想要的效果怎么解决。

直接上代码就不来虚的了：

  /// <summary>
    /// 使用NXOPEN来创建拉伸操作并且返回特征的tag值
    /// </summary>
    /// <returns></returns>
    public Tag NXopenCreateExtrude(string endextend, Feature feature, Sketch sketch,Body body)
    {
        NXOpen.Features.Feature nullNXOpen_Features_Feature = null;
        NXOpen.Features.ExtrudeBuilder extrudeBuilder1;
        extrudeBuilder1 = workPart.Features.CreateExtrudeBuilder(nullNXOpen_Features_Feature);
        NXOpen.Section section1;
        section1 = workPart.Sections.CreateSection(0.00095, 0.001, 0.050000000000000003);
        extrudeBuilder1.Section = section1;
        extrudeBuilder1.AllowSelfIntersectingSection(true);
        NXOpen.Unit unit1;
        unit1 = extrudeBuilder1.Draft.FrontDraftAngle.Units;
        extrudeBuilder1.BooleanOperation.Type = NXOpen.GeometricUtilities.BooleanOperation.BooleanType.Create;
        NXOpen.Body[] targetBodies1 = new NXOpen.Body[1];
        NXOpen.Body nullNXOpen_Body = null;
        targetBodies1[0] = nullNXOpen_Body;
        extrudeBuilder1.BooleanOperation.SetTargetBodies(targetBodies1);
        extrudeBuilder1.Limits.StartExtend.Value.SetFormula("0");
        extrudeBuilder1.Limits.EndExtend.Value.SetFormula(endextend);
        extrudeBuilder1.BooleanOperation.Type = NXOpen.GeometricUtilities.BooleanOperation.BooleanType.Subtract;
        NXOpen.Body[] targetBodies2 = new NXOpen.Body[1];
        targetBodies2[0] = nullNXOpen_Body;
        extrudeBuilder1.BooleanOperation.SetTargetBodies(targetBodies2);
        NXOpen.GeometricUtilities.SmartVolumeProfileBuilder smartVolumeProfileBuilder1;
        smartVolumeProfileBuilder1 = extrudeBuilder1.SmartVolumeProfile;
        smartVolumeProfileBuilder1.OpenProfileSmartVolumeOption = false;
        smartVolumeProfileBuilder1.CloseProfileRule = NXOpen.GeometricUtilities.SmartVolumeProfileBuilder.CloseProfileRuleType.Fci;
        section1.SetAllowedEntityTypes(NXOpen.Section.AllowTypes.OnlyCurves);
        NXOpen.Features.Feature[] features1 = new NXOpen.Features.Feature[1];
        //NXOpen.Features.SketchFeature sketchFeature1 = ((NXOpen.Features.SketchFeature)workPart.Features.FindObject("SKETCH(490)"));
        features1[0] = feature;
        NXOpen.CurveFeatureRule curveFeatureRule1;
        curveFeatureRule1 = workPart.ScRuleFactory.CreateRuleCurveFeature(features1);
        section1.AllowSelfIntersection(true);
        NXOpen.SelectionIntentRule[] rules1 = new NXOpen.SelectionIntentRule[1];
        rules1[0] = curveFeatureRule1;
        NXOpen.NXObject nullNXOpen_NXObject = null;
        NXOpen.Point3d helpPoint1 = new NXOpen.Point3d(0.0, 0.0, 0.0);
        section1.AddToSection(rules1, nullNXOpen_NXObject, nullNXOpen_NXObject, nullNXOpen_NXObject, helpPoint1, NXOpen.Section.Mode.Create, false);
        NXOpen.Sketch sketch1 = sketch;
        NXOpen.Direction direction1;
        direction1 = workPart.Directions.CreateDirection(sketch1, NXOpen.Sense.Forward, NXOpen.SmartObject.UpdateOption.WithinModeling);
        extrudeBuilder1.Direction = direction1;
        NXOpen.Unit unit2;
        unit2 = extrudeBuilder1.Offset.StartOffset.Units;
        //NXOpen.Expression expression2;
        //expression2 = workPart.Expressions.CreateSystemExpressionWithUnits("0", unit2);
        extrudeBuilder1.BooleanOperation.Type = NXOpen.GeometricUtilities.BooleanOperation.BooleanType.Subtract;
        NXOpen.Body[] targetBodies3 = new NXOpen.Body[1];
        NXOpen.Body body1 = body;
        targetBodies3[0] = body1;
        extrudeBuilder1.BooleanOperation.SetTargetBodies(targetBodies3);
        extrudeBuilder1.ParentFeatureInternal = false;
        NXOpen.Features.Feature feature1;
        feature1 = extrudeBuilder1.CommitFeature();
        NXOpen.Expression expression3 = extrudeBuilder1.Limits.StartExtend.Value;
        NXOpen.Expression expression4 = extrudeBuilder1.Limits.EndExtend.Value;
        extrudeBuilder1.Destroy();
        //workPart.Expressions.Delete(expression2);
        return feature1.Tag;
    }

解决方法是我采用了NXOPEN重新封装了一个方法，然后这些入参都是我试验过的，需要的小伙伴直接拿去用就行了。
实验效果也是达到了我们想要的预期效果，非常nice。

今天要讲的就这么多，我们下篇文章再见。

散会