How to programmatically load a new symbol from an existing Family in a Revit project

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You will find that neither of the following overloaded methods will work for you:

public bool Document::LoadFamilySymbol(string filename, string name)

public bool Document::LoadFamilySymbol(string filename, string name, out FamilySymbol symbol)

You will have to use the third version of this overloaded method:

public bool Document::LoadFamilySymbol(string filename, string name, IFamilyLoadOptions familyLoadOptions, out FamilySymbol symbol)

In order to use this though, you will have to implement the IFamilyLoadOptions interface like this:

class FamilyOption : IFamilyLoadOptions

{

public bool OnFamilyFound(

bool familyInUse,

out bool overwriteParameterValues)

{

overwriteParameterValues = true;

return true;

}

public bool OnSharedFamilyFound(

Family sharedFamily,

bool familyInUse,

out FamilySource source,

out bool overwriteParameterValues)

{

source = FamilySource.Family;

overwriteParameterValues = true;

return true;

}

Next use the instance of this class with the right version of the LoadFamilySymbol method like this:

document.LoadFamilySymbol(familyFile, symbolName, new FamilyOption(), out gotSymbol)

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