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Editorial Team
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Asked: 2026-05-15T11:10:22+00:00

When reading the MSDN documentation it always lets you know if a class is

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When reading the MSDN documentation it always lets you know if a class is thread safe or not. My question is how do you design a class to be thread safe? I am not talking about calling the class with locking I am meaning I am working for Microsoft create XXX class\object and I want to be say it is “Thread Safe” what would I need to do?

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  1. Editorial Team

    The easiest and most foolproof way of making a class thread safe is to make it immutable. The beauty of it is that you don’t ever have to bother with locking again.

    Recipe: Make all instance variables readonly in C# (final in Java).

    • An immutable object, once created and initialized in the constructor, cannot change.
    • An immutable object is thread safe. Period.
    • This is not the same as having a class with only constants.
    • For mutable parts of your system, you still need to account for and handle locking/synchronization property. This is one reason to write immutable classes in the first place.

    See this question as well.

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