Question

I get the following error message with the code below. I am not sure if this has to do with the Grasshopper kernel or if I am not writing the DataAccess.GetDataList() method correctly. I hope you can help.

The type arguments for method 'Grasshopper.Kernel.IGH_DataAccess.GetDataList<T>(int, System.Collections.Generic.List<T>)' cannot be inferred from the usage. Try specifying the type arguments explicitly.

code:

protected override void RegisterInputParams(GH_Component.GH_InputParamManager pManager)
{
pManager.AddTextParameter("SomeString", "SS", "Send Some String Somwhere", GH_ParamAccess.list); //0
}
protected override void SolveInstance(IGH_DataAccess DA)
{

string SomeString = default(string);
DA.GetDataList(0, ref SomeString);

if (!DA.GetDataList(0, ref SomeString)) return;

}

Answer 1

The error says the function requires an int and a List<T> but you’re supplying an int and a string. You also don’t need the ref modifier.

You need to do something like this:

List<string> someStrings = new List<string>();
if(! DA.GetDataList(0, someStrings)) return;