C# casting becomes null

Grasshopper Developer
1

So i’m turning off hinting on some of my components cause it greatly increases my computation time, but after using casting, i’m running into a problem where the cast just becomes null.

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can someone please enlighten me on why this is?

2

Could it be that this raises an exception? Probably a item not found exception?

My guess would be that you have a problem due to the way you iterate over the datatree. No idea how your datatree is structured, but my guess is that the pth = new GH_Path(i) is the problem and it should rather be GH_Path pth = x.Paths[i] ? And then retrieve the Branch as x.Branch(pth) and then iterate over this list with j?

If you think the casting is the problem, just do it in a separate line, assign it to variable and test for nullity? Or if you can’t do that because the type doesn’t allow null as value, cast and catch the NullException

3

Thanks for your reply.

This is the data structure of the input

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So for some reason the way i’m casting is creating null’s, so instead of (int) I have to use Convert.ToInt32() , I don’t know why, but it’s now working.

5

I also tried to reproduce this, but it works fine for me. Maybe try iterating over the datatree in a safe way ? Your code is prone to raise exceptions if something changes in the structure of the DataTree:

foreach (GH_Path path in x.Paths)
{
  List<System.Object> branch = x.Branch(path);
  foreach (object item in branch)
  {
    int i = (int) item;
    castedIntegers.Add(i, path);
  }
}