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Editorial Team
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Asked: 2026-05-25T10:38:14+00:00

I’m trying to modify this example to my needs, but one line in particular

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I’m trying to modify this example to my needs, but one line in particular has me stumped. The line ((Action<List<MessageInfo>>)parm)(msgs); in the chatserver makes absolutely no sense to me. I can see that it typecasts (msgs) to the type ((Action<List<MessageInfo>>)parm);, but it doesn’t seem to do anything at all.

I hope that someone can help me understand this, as I have a feeling it one of the last pieces I’m missing of this puzzle…

Kind regards.

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1 Answer

  1. Editorial Team

    They are casting a delegate, then invoking it with msgs.

    This bit:

    ((Action<List<MessageInfo>>)parm);

    Casts the delegate. Then it invokes the delegate with msgs.

    Breaking it down a bit:

    Action<List<MessageInfo>> del = ((Action<List<MessageInfo>>)parm);
del(msgs);

    The author just chose to collapse all of that into one line.

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