Question

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What is the best wayto add single element to an IEnumerable collection?

Let’s say I want to concantenate Enumerable.Repeat(100, 100) and the number 3, what is the nicest way to do this?

Of course I can do
Enumerable.Repeat(100, 100).Concat(Enumerable.Repeat(3,1)), but it doesn’t look very expressive…

Answer 1

public static IEnumerable<T> Concat(this IEnumerable<T> source, T item)
{
    //the code here is not very expressive to you :)
}

EDIT It’s suggested not to use the method name Concat, using ConcatSingle or ConcatOne instead, see the discussions in below comments.