Zero Touch Nodes - Cannot load type System.Math

danail.momchilov · September 8, 2023, 8:39am

Hello,

I am not sure why I see this error:

It’s about this line here:

chuongmep · September 8, 2023, 8:49am

Hi @danail.momchilov with this issue, we have so many reason to explain why, can I know more detail about version of dynamo also what platform software you are working on ?

danail.momchilov · September 8, 2023, 8:55am

I see, in this particular case it’s Revit 2021 with Dynamo 2.6

I am creating some nodes as Visual Studio Project as Zero Touch nodes. For some reason. System.Math fails to load in Dynamo

chuongmep · September 8, 2023, 9:01am

You can try to create a project extension and use resolve assembly to try load again :
This is example you can reference.

github.com

chuongmep/OpenMEP/blob/fb9e850dfc192814d426592ab5d6d9cf5b4c0d52/OpenMEPViewExtension/OpenMEPViewExtension.cs#L22C5-L40


      
          private Assembly? CurrentDomainOnAssemblyResolve(object sender, ResolveEventArgs args)
          {
              // Get assembly name
              var assemblyName = new AssemblyName(args.Name).Name + ".dll";
          
              // Get resource name
              var resourceName = Assembly.GetExecutingAssembly().GetManifestResourceNames().Where(x => x.EndsWith(".dll"))
                  .ToArray().FirstOrDefault(x => x.EndsWith(assemblyName));
              if (resourceName == null)
              {
                  return null;
              }
          
              // Load assembly from resource
              using (var stream = Assembly.GetExecutingAssembly().GetManifestResourceStream(resourceName))
              {
                  var bytes = new byte[stream!.Length];
                  stream.Read(bytes, 0, bytes.Length);
                  return Assembly.Load(bytes);

danail.momchilov · September 8, 2023, 9:04am

thx I will give it a try. I also had another idea, could it be due to the project and Dynamo using a different .net version? I have set the one in the project to .net 6?

jacob.small · September 8, 2023, 9:06am

Yes. That would be problematic.

You want to utilize .NET 4 for everything except a Dynamo 3.0 tool, and since Revit utilizes 2.6 to 2.18, you’re in .NET 4 land.

chuongmep · September 8, 2023, 9:06am

.NET 6 won’t work with Revit 2021 anymore, you net set with .net framework 4.8

danail.momchilov · September 11, 2023, 10:26am

yeah that fixed it, thank you all! downgrading the .net version caused a chain reaction of other issues but I made it through will be a good lesson for next time

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Zero Touch Nodes - Cannot load type System.Math

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