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Asked: 2026-05-12T07:57:06+00:00

I want to have a generic thread safe collection and I saw that the

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I want to have a generic thread safe collection and I saw that the Arraylist can easily be used thread safe by its static Synchronized method but what bugs me is that this ArrayList is not generic so when I want to use my objects I always have to cast them. Is there an easier way to do this? Also other list types would be possible.

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  1. Editorial Team

    A little knowledge is a dangerous thing 😉 Yes, you could use Meta-Knight’s suggestion and use SyncRoot, but you need to be careful – it’s not a panacea. See this post from the BCL Team Blog from Microsoft to see why it’s not as simple as SyncRoot. Quotes from that post:

    A few astute users of our generic
    collections observed that we no longer
    provide a public SyncRoot property on
    ICollection<T>

    and

    I think we’re better off forcing
    people to think more heavily about
    synchronization, and frankly a
    SyncRoot property on our generic
    collections doesn’t provide any value.

    Of course, that’s not to say it can’t be used under any circumstances – you just have to think the use cases through carefully and not be on auto-pilot.

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