CastTo List<T>

Hi,

I have got own class called GH_Model.

Model has a property Elements what is a List of GH_Elements.

I need to cast from GH_Model output to GH_Elements input (between two components).

So I need to cast List<GH_Elements> from GH_Model (no only one object).

Is it possible cast to list or array of object? How can I do it?

This is my try for better understanding what I want:

public override bool CastTo(ref Q target) { //TRY CAST TO List. if (typeof(Q).IsAssignableFrom(typeof(List<GH_Elements>))) { object ptr = this.Value.Elements; //this is List<GH_Elements> target = (Q)ptr; return true; } //TRY CAST TO GH_Structure. if (typeof(Q).IsAssignableFrom(typeof(GH_Structure<GH_Elements>))) { object ptr = this.Value.Elements.ToArray(); target = (Q)ptr; return true; } //THIS WORKS (only single object) if (typeof(Q).IsAssignableFrom(typeof(GH_Element))) { object ptr = this.Value.Elements[0]; target = (Q)ptr; return true; } return false; }

Thanks

Replies to This Discussion

Permalink Reply by Tom Svilans on July 30, 2016 at 5:30am

Resurrecting an old post... but did you get anywhere with this? Did you get it working?

Permalink Reply by Lionel on December 5, 2016 at 10:46am

Hello,

Same here. I'm running in the same kind of problem. Can anybody can give a little clue on that ?

I have a custom object (Grid) which internal representation is a jagged array (data = double[N][]).

Each sub array (data[d], d=0 … N-1) correspond to a « dimension » of the grid object. Additionally, each dimension can have a Label (labels = string[N])

I'm setting up a GH_Grid data type so it can be wired through GH caneva.
I would like to CastTo this custom object into a DataTree<double> or GH_Structure<GH_Number> when the user plug it into a number parameter. I also would like to CatFrom a DataTree<double> or GH_Structure<GH_Number> input to create a new Grid object with empty labels.

Will the help and forum post are quite helpful form « item » parameter, this is quite confusing to me how it works for list or tree input/outputs.

Thanks.

Permalink Reply by David Rutten on December 6, 2016 at 6:57am

The casting methods only allow you to convert from one instance to one other instance. It's not possible to use this approach to convert some type of IGH_Goo into a list or a tree of IGH_Goo. You'll need to create a custom component for such a conversion.

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