3rd party dll in Revit Addin

[Anonymous]

Hi,

I have a Revit Addin developed. I referenced a 3rd party dll (no source code that assembly). When I run the Revit plugin it throws me a "System.IO.FileNotFoundException: Could not load file or assembly 'Esri.FileGDBAPI.dll' or one of its dependencies. The specified module could not be found." error. Can someone help me how to overcome this. Thanks.

Arun Raj

[MarryTookMyCoffe]

put your loacal reference dll in the same folder you put your app dll.

[Anonymous]

Hey.. thanks for the response. I did that but with no success. I copied the my custom dll into C:\Program Data\Autodesk\Revit\Addinns\2018\ folder along with the addin and its assembly. still no success. Have you ever referenced any custom dll ? btw I am using 64 bit version of my custom dll.

[MarryTookMyCoffe]

I have my own custom libbray for revit adn i use sqlite.
I hade a little problem with sql but it was in the end problem with file not in right place.

1)see if you have set reference as local.
2)look on App.config. See if your dll  is there.

3)in the end you can try to remove reference (or nuget, don't know from where you get it) and add it again

[mattmas]

Whenever I have to use a referenced DLL in my addin, I generally setup an AssemblyResolve event to tell .NET where to find the DLL in question.

(this is because .NET does not automatically load from the same location as your DLL - it automatically loads from the same location as REVIT.EXE).

See Jeremy's notes here:

http://thebuildingcoder.typepad.com/blog/2014/05/rvtva3c-assembly-resolver.html

Good Luck,

Matt

[MarryTookMyCoffe]

thx for this info. didn't knew about it, now I'm surprised that my app work.
I look on place where revit.exe is and I have a System.Data.SQLite.dll, but how it get there ? if i didn't put it there ? or maybe revit had it already?

[mattmas]

Revit does use SQLite in a number of different ways, so yes, that's possible.

[premmuru]

I faced this problem when loading a 3P assembly by referencing it in XAML (using WPF). Other 3P .dll files which are imported using using statements loads fine without any problem but the ones referred through XAML, Revit is only searching install location. I followed the above advice from mattmas and included this code in my ExternalCommand to add my addin folder where my .dll files are copied to and it works!

AppDomain currentDomain = AppDomain.CurrentDomain;
currentDomain.AssemblyResolve += new ResolveEventHandler(LoadFromSameFolder);

static Assembly LoadFromSameFolder(object sender, ResolveEventArgs args)
{
    string folderPath = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);
    string assemblyPath = Path.Combine(folderPath, new AssemblyName(args.Name).Name + ".dll");
    if (!File.Exists(assemblyPath)) return null;
    Assembly assembly = Assembly.LoadFrom(assemblyPath);
    return assembly;
}

https://stackoverflow.com/questions/1373100/how-to-add-folder-to-assembly-search-path-at-runtime-in-...