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Editorial Team
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Editorial Team
Asked: May 16, 20262026-05-16T10:22:50+00:00 2026-05-16T10:22:50+00:00

I have a list who have some element like A B C D. I

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I have a list who have some element like A B C D.
I want to get the index of B.
How i can get it?

I want to do this in C#.

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  1. Editorial Team
    Editorial Team
    2026-05-16T10:22:51+00:00Added an answer on May 16, 2026 at 10:22 am

    This can be as simple as:

    int index = list.IndexOf(b);
    

    where b is the thing to find, however there is an ambiguity here over the definition of equality. By default, classes will use reference-equality. A common mistake is creating two class instances that have identical fields, and expecting them to count as equal. To do this, you should really override Equals (and ideally implement IEquatable<T> for the same T). If you override Equals, you should also override GetHashCode, and ideally the == and != operators.

    Another alternative is to find the match with a predicate or comparer, which can avoid all that work

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