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Editorial Team
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Asked: 2026-06-13T01:29:52+00:00

Is there a function that would allow you to add an element to a

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Is there a function that would allow you to add an element to a List<T> and get the index as int back? List<T>.Add() is a void and does not return a value.

List.Count-1 is a solution when your are not working with threads. My list is a static member and can be accessed with multiple thread at a time and using the count-1 value is totally thread unsafe and could easily lead to wrong results.

The index will be used for specific treatment to each element.

Thank you!

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  1. Editorial Team

    List’s methods are not thread safe alone; if you just call List.Add repeatedly from several threads you could very well run into problems. You need to use some sort of synchronization technique if you’re going to use a List in the first place, so you might as well include a call to List.Count inside of that critical section.

    Your other option would be to use a collection that is designed to be used by multiple threads, such as those in System.Collections.Concurrent.

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