c# Array.FindAllIndexOf which FindAll IndexOf

Question

I know c# has Array.FindAll and Array.IndexOf.

Is there a Array.FindAllIndexOf which returns int[]?

Answer 1

I've used Nikhil Agrawal's answer to create the following related method, which may be useful.

public static List FindAllIndexOf(List values, List matches)
    {
        // Initialize list
        List index = new List();

        // For each value in matches get the index and add to the list with indexes
        foreach (var match in matches)
        {
            // Find matches 
            index.AddRange(values.Select((b, i) => Equals(b, match) ? i : -1).Where(i => i != -1).ToList());

        }

        return index;
    }

Which takes a list with values and a list with values that are to be matched. It returns a list of integers with the index of the matches.