Assigning default values for input parameters

Replies to This Discussion

Permalink Reply by Pieter Segeren on April 24, 2015 at 5:24am

Hi Roey, you can write something like this:

pManager.AddGenericParameter("", "", "", GH_ParamAccess..., YOUR DEFAULT VALUE)

Permalink Reply by Roey Yaniv on April 24, 2015 at 5:43am

that's what I usually do.

in this case, the generic parameters are structures of 8 fields. how do I assign values for each field using what you wrote?

Permalink Reply by David Rutten on April 24, 2015 at 5:43am

Hi Roey,

your data types do not derive from IGH_Goo, so you cannot put them in parameters. You have to wrap them up first inside GH_ObjectWrapper, or if you want to do it properly you can provide specific GH_Goo derived types for them.

May I also suggest you make all your structs immutable (if you want mutable data, uses classes instead of structs), and do not use abbreviations for variables and fields. You may remember today what it all means, but when you come back to this code one year from now, it'll be hard to figure out what e, a, i, l, no, val, and loc actually mean.

Permalink Reply by David Rutten on April 24, 2015 at 6:04am

See attached file. It properly encapsulates private member fields, it makes all structs immutable, and it assign default values to the input parameters inside RegisterInputParams.

Attachments:

• SolveStructureComponent.cs, 10 KB

Permalink Reply by Roey Yaniv on April 24, 2015 at 10:11pm

Thanks for the quick help.

and also for the enlightening remarks:)))

Permalink Reply by Roey Yaniv on April 24, 2015 at 10:42pm

I have another question now.

If I want to access the parameters of "member" i get an error that this is readonly and I can't change it. for example, in the code you uploaded, try to assign "c" to member.L

Permalink Reply by David Rutten on April 25, 2015 at 3:37am

Yes, that's what immutable means. Once a struct has been constructed, it can no longer be changed. You have to make a new struct if you want a different one. You could also add methods on the struct that allow you to change one of the fields.

public MyStruct SetPropertX(Type newX)
{
return new MyStruct(newX, _y, _z);
}