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Home/ Questions/Q 3753510
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Editorial Team
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Editorial Team
Asked: May 19, 20262026-05-19T09:24:12+00:00 2026-05-19T09:24:12+00:00

Can you please explain to me what where T : class, new() means in

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Can you please explain to me what where T : class, new() means in the following line of code?

void Add<T>(T item) where T : class, new();
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  1. Editorial Team
    Editorial Team
    2026-05-19T09:24:12+00:00Added an answer on May 19, 2026 at 9:24 am

    That is a constraint on the generic parameter T. It must be a class (reference type) and must have a public parameter-less default constructor.

    That means T can’t be an int, float, double, DateTime or any other struct (value type).

    It could be a string, or any other custom reference type, as long as it has a default or parameter-less constructor.

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