Passing variables to a form

[Anonymous]

New to the Revit API so please excuse what is probably a very simple task.

How do I pass a variable from the current Revit session to a form. For example, if I wanted to pass the current Revit Version to a label that would show up in a form.

I can extract the version into a variable that I can display in a taskdialog:

  string verNum = app.VersionNumber;
TaskDialog.Show("Version Number", verNum);

but I can't seem to pass the to a form

[rosalesduquej]

Hi Tbh, 

Can this be solve by just making the variable you are assigning the Revit Version a public variable, so you can access it from the class you are creating to do your form?

public string verNum;

verNum = app.VersionNumber;

A little info about public variables below.

Public variables can be used in any procedures in the project. If a public variable is declared in a standard module or a class module, it can also be used in any projects that reference the project where the public variable is declared.

https://msdn.microsoft.com/en-us/library/office/gg264241.aspx?f=255&MSPPError=-2147217396 

Is this what you meant ? Cheers and hope everything goes well. 

Thanks,

[Revitalizer]

Hi,

you could pass the variable as a parameter in your Form's constructor.

Also, you could add some SetWhatEver(yourParameter) methods to your Form class to modify it after creation.

Revitalizer

[Aaron.Lu]

There are a lot of ways to do that:
1. pass the parameters with the Form constructor, e.g.
public MyWinForm(string verion):Form(){}
2. pass via form properties, e.g.
MyWinForm form = new MyWinForm();
form.RvtVersion = "xxx";
3. use static members outside of the form, e.g.
public MyCommand: IExternalCommand
{
public static string Version;
public Result Exeucte(...)
{
Version = ...;
}
}

[Anonymous · Accepted solution]

your comman class, creat a public static variable

E.G 

namespace MyCommand{

           public class Command : IExternalCommand
           {
                     public static string LabelName;

                      ....................

                     ...................

                     public Result Execute(
                     ExternalCommandData commandData,
                     ref string message,
                     ElementSet elements)
                     {

                            ..............

                            .............

                     }

            }

}

then in your form.cs when you want to call the string use

label1.text = MyCommand.Command.LabelName;

hope this helps

[Anonymous]

That turned out to be the issue. I wasn't making my variable public. I ended up creating a subclass that generated a public variable and passed it to the label. Made sense once I figured out the problem.

Got my first 'useable' addin complete. Nice to get back into the programming side after so many years away.

Appreciate everyones feedback.