Revit Family API 添加几何实体

先创建一个封闭曲线createProfileLShape();
再创建实体，这里需要手工画一个参考平面Reference Plane：

[TransactionAttribute(Autodesk.Revit.Attributes.TransactionMode.Manual)]
public class cmdCreateSolid : IExternalCommand
{
    //创建封闭曲线
    CurveArrArray createProfileLShape(Application _rvtApp)
    {
        //
        // define a simple L-shape profile
        //
        //  5 tw 4
        //   +-+
        //   | | 3          h = height
        // d | +---+ 2
        //   +-----+ td
        //  0        1
        //  6  w
        //

        // sizes (hard coded for simplicity)
        // note: these need to match reference plane. otherwise, alignment won't work.
        // as an exercise, try changing those values and see how it behaves.
        //
        double w = Util.mmToFeet(600.0); // those are hard coded for simplicity here. in practice, you may want to find out from the references)
        double d = Util.mmToFeet(600.0);
        double tw = Util.mmToFeet(150.0); // thickness added for Lab2
        double td = Util.mmToFeet(150.0);

        // define vertices
        //
        const int nVerts = 6; // the number of vertices

        XYZ[] pts = new XYZ[] {
    new XYZ(-w / 2.0, -d / 2.0, 0.0),
    new XYZ(w / 2.0, -d / 2.0, 0.0),
    new XYZ(w / 2.0, (-d / 2.0) + td, 0.0),
    new XYZ((-w / 2.0) + tw, (-d / 2.0) + td, 0.0),
    new XYZ((-w / 2.0) + tw, d / 2.0, 0.0),
    new XYZ(-w / 2.0, d / 2.0, 0.0),
    new XYZ(-w / 2.0, -d / 2.0, 0.0) };  // the last one is to make the loop simple

        // define a loop. define individual edges and put them in a curveArray
        //
        CurveArray pLoop = _rvtApp.Create.NewCurveArray();
        for (int i = 0; i < nVerts; ++i)
        {
            Line line = _rvtApp.Create.NewLineBound(pts[i], pts[i + 1]);
            pLoop.Append(line);
        }

        // then, put the loop in the curveArrArray as a profile
        //
        CurveArrArray pProfile = _rvtApp.Create.NewCurveArrArray();
        pProfile.Append(pLoop);
        // if we come here, we have a profile now.

        return pProfile;
    }
    Extrusion CreateSolid(Application app, Document doc)
    {
        CurveArrArray pProfile = createProfileLShape(app);
        //这个参考平面模板中没有，可以切换到Front立面，自己画一个。
        ReferencePlane pRefPlane = Util.findElement(doc, typeof(ReferencePlane), "Reference Plane") as ReferencePlane;
        SketchPlane pSketchPlane = doc.FamilyCreate.NewSketchPlane(pRefPlane.Plane);
        double dHeight = Util.mmToFeet(4000);
        bool bIsSolid = true;
        Extrusion pSolid = doc.FamilyCreate.NewExtrusion(bIsSolid, pProfile, pSketchPlane, dHeight);
        return pSolid;
    }
    public Result Execute(ExternalCommandData commandData, ref string messages, ElementSet elements)
    {
        UIApplication app = commandData.Application;
        Document doc = app.ActiveUIDocument.Document;

        Transaction ts = new Transaction(doc, "AddType");
        ts.Start();

        //
        FamilyManager m_familyMgr = doc.FamilyManager;

        CreateSolid(app.Application, doc);


        ts.Commit();

        return Result.Succeeded;
    }
}
public class Util
{
    //Revit内部单位feet转化为mm即毫米
    public static double mmToFeet(double val) { return val / 304.8; }
    public static double feetToMm(double val) { return val * 304.8; }
    //通过类型与名称找Element
    public static Element findElement(Document _rvtDoc, Type targetType, string targetName)
    {
        // get the elements of the given type
        //
        FilteredElementCollector collector = new FilteredElementCollector(_rvtDoc);
        collector.WherePasses(new ElementClassFilter(targetType));

        // parse the collection for the given name
        // using LINQ query here. 
        // 
        var targetElems = from element in collector where element.Name.Equals(targetName) select element;
        List<Element> elems = targetElems.ToList<Element>();

        if (elems.Count > 0)
        {  // we should have only one with the given name. 
            return elems[0];
        }

        // cannot find it.
        return null;
    }
    #region Formatting and message handlers
    public const string Caption = "Revit Family API Labs";

    /// <summary>
    /// MessageBox wrapper for informational message.
    /// </summary>
    public static void InfoMsg(string msg)
    {

        System.Diagnostics.Debug.WriteLine(msg);
        WinForm.MessageBox.Show(msg, Caption, WinForm.MessageBoxButtons.OK, WinForm.MessageBoxIcon.Information);
    }

    /// <summary>
    /// MessageBox wrapper for error message.
    /// </summary>
    public static void ErrorMsg(string msg)
    {
        WinForm.MessageBox.Show(msg, Caption, WinForm.MessageBoxButtons.OK, WinForm.MessageBoxIcon.Error);
    }
    #endregion // Formatting and message handlers
}

url:http://greatverve.cnblogs.com/p/revit-family-api-create-solid.html