前言

Revit 作为一款成熟的商业软件，它将自己的UI选择功能也通过 API 暴露出来。通过 API 可以按照特定的过滤规则来选择相应的元素，能力和UI基本上是等价的。这个 SDK 用四个例子展示了 API 的能力，内容如下。

内容

PickforDeletion

核心逻辑：

1. 通过 m_document.Selection.PickObjects(ObjectType.Element) 选择若干个元素
2. 通过 m_document.Document.Delete(elemDeleteList) 删除元素

核心代码：

// 保存需要删除的元素
List<ElementId> elemDeleteList = new List<ElementId>();
// 通过PickObjects选择多个元素
IList<Reference> eRefList = m_document.Selection.PickObjects(ObjectType.Element, "Please pick some element to delete. ESC for Cancel.");
// 将选中的元素加入选择集
foreach (Reference eRef in eRefList){if (eRef != null && eRef.ElementId != ElementId.InvalidElementId){elemDeleteList.Add(eRef.ElementId);}
}
// 删除选择集中的元素
m_document.Document.Delete(elemDeleteList);

PlaceAtPointOnWallFace

核心逻辑：

1. 通过 m_document.Selection.PickObject(ObjectType.PointOnElement) 选择一个点
2. 放置窗户：m_document.Document.Create.NewFamilyInstance

核心代码：

// 选择墙上的一个点
Reference pickedRefer = m_document.Selection.PickObject(ObjectType.PointOnElement, new WallFaceFilter(m_document.Document), "Please pick a point on Wall face.");
// 找到对应的窗户类型
string symbolName = "36\" x 48\"";
FilteredElementCollector elemCollector = new FilteredElementCollector(m_document.Document);
elemCollector.WhereElementIsElementType();
var query = from element in elemCollector where element.Name == symbolName select element;
Element elemType = query.Single<Element>();
FamilySymbol windowType = elemType as FamilySymbol;
// 放置窗户
m_document.Document.Create.NewFamilyInstance(pickedRefer .GlobalPoint, windowType, m_document.Document.GetElement(pickedRefer ), StructuralType.NonStructural);

PlaceAtPickedFaceWorkplane

核心逻辑：

1. 选择一个面，m_document.Selection.PickObject(ObjectType.Face)
2. 提取面，创建工作平面：SketchPlane plane = SketchPlane.Create(m_document.Document, geometryPlane);
3. 设置新的工作平面：m_document.Document.ActiveView.SketchPlane = faceSketchPlane;m_document.Document.ActiveView.ShowActiveWorkPlane();
4. 选择工作平面上的一个点：m_document.Selection.PickPoint
5. 创建模型线：Curve circle = Arc.Create(point, 5, 0, Math.PI * 2, faceSketchPlane.GetPlane().XVec, faceSketchPlane.GetPlane().YVec);m_CreationBase.NewModelCurve(circle, faceSketchPlane);

核心代码：

// 选择一个面
Reference faceRef = m_document.Selection.PickObject(ObjectType.Face, new PlanarFaceFilter(m_document.Document), "Please pick a planar face to set the work plane. ESC for cancel.");
// 通过面的索引获取面的几何
GeometryObject geoObject = m_document.Document.GetElement(faceRef).GetGeometryObjectFromReference(faceRef);
PlanarFace planarFace = geoObject as PlanarFace;
// 创建一个工作平面
Plane geometryPlane = Plane.CreateByNormalAndOrigin(planarFace.FaceNormal, planarFace.Origin);
SketchPlane faceSketchPlane = SketchPlane.Create(m_document.Document, geometryPlane);
// 将新建的工作平面设置为当前视图的活动工作平面
m_document.Document.ActiveView.SketchPlane = faceSketchPlane;
m_document.Document.ActiveView.ShowActiveWorkPlane();
// 选择工作平面上的一个点
ObjectSnapTypes snapType = ObjectSnapTypes.Centers | ObjectSnapTypes.Endpoints | ObjectSnapTypes.Intersections | ObjectSnapTypes.Midpoints | ObjectSnapTypes.Nearest | ObjectSnapTypes.WorkPlaneGrid;
XYZ point = m_document.Selection.PickPoint(snapType, "Please pick a point to place component.");
// 以选中点为中心绘制一个圆
Curve circle = Arc.Create(point, 5, 0, Math.PI * 2, faceSketchPlane.GetPlane().XVec, faceSketchPlane.GetPlane().YVec);
m_CreationBase.NewModelCurve(circle, faceSketchPlane);

SelectionDialog

核心逻辑：

1. 选择一个元素：m_document.Selection.PickObject(Autodesk.Revit.UI.Selection.ObjectType.Element
2. 选择一个目标点：XYZ targetPoint = m_document.Selection.PickPoint("Please pick a point.")
3. 移动元素到目标点：ElementTransformUtils.MoveElement(m_document.Document,elem.Id, vecToMove);

核心代码：

// 选择要移动的元素，记录初始位置
Reference eRef = m_document.Selection.PickObject(Autodesk.Revit.UI.Selection.ObjectType.Element, "Please pick an element.");
SelectedElement = m_document.Document.GetElement(eRef);
m_elemPickedPoint = eRef.GlobalPoint;
// 选择一个目标点
XYZ targetPoint = m_document.Selection.PickPoint("Please pick a point.);
// 移动元素到目标点
XYZ vecToMove = targetPoint - m_elemPickedPoint;
m_elemPickedPoint = targetPoint;
ElementTransformUtils.MoveElement(m_document.Document,elem.Id, vecToMove);

参考

创建族实例，参考博客：https://blog.csdn.net/weixin_44153630/article/details/104650998
ElementTransformUtils，参考博客：https://blog.csdn.net/weixin_44153630/article/details/103884784