RevitAPI: 如何在详图构件上创建尺寸标注

下图是两根详图构件，每个构件本身就是一条线。

我们想要做到这样：

我们知道NewDimension函数是这样的：

Dimension NewDimension(View view, Line line, ReferenceArray references)

那么最后一个ReferenceArray当然就是需要做标注的几何对象的引用了，问题是，如何获取这些引用？

很显然，通过(FamilyInstance.Location as LocationCurve).Curve.Reference拿到的结果是空。

我们就只能通过get_Geometry方法了。请看代码：

private static Line GetReferenceOfDetailComponent(Element element,View view)
{Options options = new Options();options.ComputeReferences = true;options.IncludeNonVisibleObjects = true;if (view != null)options.View = view;elseoptions.DetailLevel = ViewDetailLevel.Fine;var geoElem = element.get_Geometry(options);foreach (var item in geoElem){Line line = item as Line;if (line != null){//in this case, code will never be executed to here}else{GeometryInstance geoInst = item as GeometryInstance;if (geoInst != null){GeometryElement geoElemTmp = geoInst.GetSymbolGeometry();foreach (GeometryObject geomObjTmp in geoElemTmp){Line line2 = geomObjTmp as Line;if (line2 != null){//check if it is what you wantif (line2.GraphicsStyleId.IntegerValue == 355){return line2;}}}}}}return null;
}

• Options.ComputeReferences必须为true，否是拿到的几何体的Reference都将是null
  
• 如果遍历GeometryElement的时候，碰到GeometryInstance，那么需要调用GetSymbolGeometry，获取更多几何体，而不能调用GetInstanceGeometry，因为后者得到的几何体也是无法创建Dimension的