使用FamilyManager其他的與普通添加參數與標注沒區別。[TransactionAttribute(Autodesk.Revit.Attributes.TransactionMode.Manual)]
public?class?cmdAddParam?:?IExternalCommand
{
????public?Result?Execute(ExternalCommandData?commandData,?ref?string?messages,?ElementSet?elements)
????{
????????UIApplication?app?=?commandData.Application;
????????Document?doc?=?app.ActiveUIDocument.Document;

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

????????//添加參數
????????FamilyManager?m_familyMgr?=?doc.FamilyManager;
????????bool?isInstance?=?false;
????????FamilyParameter?paramTw?=?m_familyMgr.AddParameter("Tw",?BuiltInParameterGroup.PG_GEOMETRY,?ParameterType.Length,?isInstance);
????????double?tw?=?Util.mmToFeet(150.0);
????????m_familyMgr.Set(paramTw,?tw);
????????m_familyMgr.SetFormula(paramTw,?"Width?/?4.0");//公式

????????//添加尺寸標注
????????View?pViewPlan?=?Util.findElement(doc,?typeof(ViewPlan),?"Lower?Ref.?Level")?as?View;
????????ReferencePlane?ref1?=?Util.findElement(doc,?typeof(ReferencePlane),?"Left")?as?ReferencePlane;
????????ReferencePlane?ref2?=?Util.findElement(doc,?typeof(ReferencePlane),?"offsetV")?as?ReferencePlane;
????????ReferenceArray?pRefArray?=?new?ReferenceArray();
????????pRefArray.Append(ref1.Reference);
????????pRefArray.Append(ref2.Reference);
????????XYZ?p0?=?ref1.FreeEnd;
????????XYZ?p1?=?ref2.FreeEnd;
????????Line?pLine?=?app.Application.Create.NewLineBound(p0,?p1);
????????Dimension?pDimTw?=?doc.FamilyCreate.NewDimension(pViewPlan,?pLine,?pRefArray);
????????pDimTw.Label?=?m_familyMgr.get_Parameter("Tw");

????????ts.Commit();

????????return?Result.Succeeded;
????}
}
public?class?Util
{
????//Revit內部單位feet轉化為mm即毫米
????public?static?double?mmToFeet(double?val)?{?return?val?/?304.8;?}
????public?static?double?feetToMm(double?val)?{?return?val?*?304.8;?}
????//通過類型與名稱找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-param.html

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