Revit API placing detail component using PromptForFamilyInstancePlacement

I'm trying to place a detail component using PromptFor开发者_如何学JAVAFamilyInstancePlacement, but am having trouble properly defining the FamilySymbol.

Examples that I have found show how to to this using a FilteredElementCollector, but I am trying to define the FamilySymbol by name.

Try this code (requires System.Linq) and .NET4

FamilySymbol symbol = GetElements<FamilySymbol>(commandData.Application.ActiveUIDocument.Document)
                          .Where(item => item.Name == "NameYouWant")
                          .First();
commandData.Application.ActiveUIDocument.PromptForFamilyInstancePlacement(symbol);


    /// <summary>
    /// Get the collection of elements of the specified type.
    /// <para>The specified type must derive from Element, or you can use Element but you get everything :)</para>
    /// </summary>
    /// <typeparam name="T">The type of element to get</typeparam>
    /// <returns>The list of elements of the specified type</returns>
    public IEnumerable<T> GetElements<T>(Document document) where T : Element
    {
        FilteredElementCollector collector = new FilteredElementCollector(document);
        collector.OfClass(typeof(T));
        return collector.Cast<T>();
    }

Have you already loaded the Family document into the project that you are working in? If not then you can load the family into the project using Document.LoadFamilySymbol or Document.LoadFamily. Otherwise, to find the family symbol that you are looking for, you can use something similar to the code below:

UIApplication application = commandData.Application;
UIDocument uiDocument = application.ActiveUIDocument;
Document document = application.ActiveUIDocument.Document;

FilteredElementCollector familyCollector = new FilteredElementCollector(document);
familyCollector.OfClass(typeof(FamilySymbol));

FamilySymbol familySymbolToFind = null;

foreach (FamilySymbol familySymbol in familyCollector)
{
  //To search by FamilySymbol name
  if (familySymbol.Name == "[Name of FamilySymbol to find]")
    familySymbolToFind = familySymbol;
  //To search by Family name
  else if (familySymbol.Family.Name = "[Name of Family to find]")
    familySymbolToFind = familySymbol;
}

uiDocument.PromptForFamilyInstancePlacement(familySymbolToFind);

They both work, even in Revit 2017. (On the second solution, the else if line needs a == instead of an =.)

In the second solution, I used this to make sure I had the right family name and family symbol name:

foreach (FamilySymbol familySymbol in familyCollector)
{
  if (familySymbol.Name == "Put your Family Name here" && familySymbol.Family.Name == "Put your Family Symbol Name here")
                        familySymbolToFind = familySymbol;
}