Adding rung to routine with no rungs

[AdamVanSickleAAS]

I'm trying to retrieve the collection of Rungs for a Routine that currently has no Rungs defined (it works as I expect for a routine with rungs). My L5X content was created by importing an L5X document exported from Studio 5000.

When I call routine.Content() on a routine with no rungs, it throws the following exception:

System.InvalidOperationException: 'The required attribute or child element 'RLLContent' does not exist for Routine.'

Stepping through the code and inspecting the offending routine shows that its Type is set to RLL just prior to making the call that causes the exception. If I explicitly set the Type to RLL, then the call works as I expect (which I expect is a bug). See the following:

public static LogixContainer<Rung> Rungs(this Routine routine) 
{
    LogixContainer<Rung> rungs = null;
    try
    {
        var type = routine.Type;          // This is already set to "RLL"
        rungs = routine.Content<Rung>();  // This throws an exception
    }
    catch (InvalidOperationException) 
    {
        routine.Type = RoutineType.RLL;   // explicitly re-set the type to "RLL"
        rungs = routine.Content<Rung>();  // this works as I'd expect.
        rungs.Add(new Rung("Test Rung")); // as does this
    }
    return rungs;
}

I'm guessing explicitly setting the type to RLL causes the underlying RLLContent element to be created for the Routine? The above seems to be a work around, but is there a preferred way to initialize a collection of Rungs for a Routine?

[tnunnink]

Thanks for reporting this. Didn't know the Routine content element was not there by default for empty routines. I went ahead and added a fix that ensures an empty content element is created when accessing it via Content<TCode>() so that you won't get an exception, and so that we can add Rungs to it as expected. See version 2.3.2 for the fix.

[AdamVanSickleAAS]

Cheers!