Re: Not able to add child CodeGroups

From: Greg Fee (gregfee_at_microsoft.com)
Date: 06/10/03

  • Next message: Eugene V. Bobukh [MS]: "Re: Trust Issue with SqlConnection" 
    Date: Mon, 09 Jun 2003 22:25:49 GMT

    Hi,

    Looks like you need to follow the recursive 'set' pattern to get your
    changes into the live objects. I think your _metaCodeGroup will be a child
    of the RootCodeGroup. Therefore after you make the change you need to
    visit the RootCodeGroup's children and replace the existing equivalent
    instance of _metaCodeGroup with the current one. I accomplish this in the
    caspol code by remembering where in the list of children the code group I'm
    going to manipulate is. Vaguely something like (pseudo-code, no guarantees
    here):

    void FindCodeGroup( CodeGroup parent, String name, out CodeGroup target,
    out int position )
    {
        position = 1;
        target = null;

        IEnumerator enumParentChildren = parent.Children.GetEnumerator();

        while (enumParentChildren.MoveNext())
        {
            if (((CodeGroup)enumParentChildren).Name).Equals( name ))
            {
                target = (CodeGroup)enumParentChildren;
                break;
            }
            position++;
        }
    }

    void SetCodeGroup( CodeGroup parent, CodeGroup target, int position )
    {
        int currentPosition = 1;
        target = null;

        IEnumerator enumParentChildren = parent.Children.GetEnumerator();
        ArrayList newChildren = new ArrayList();

        while (enumParentChildren.MoveNext())
        {
            if (position == currentPosition)
            {
                newChildren.Add( target );
            }
            else
            {
                newChildren.Add( enumParentChildren.Current );
            }
            currentPosition++;
        }
        parent.Children = newChildren;
    }

    If you are dealing with an arbitrary level in the tree, you potentially
    need to maintain a stack of this data so that you can record the results of
    FindCodeGroup and then use that in SetCodeGroup once you've manipulated the
    code group of your choosing.

    Greg

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