Finding first index of element that matches a condition using LINQ

Question

var item = list.Where(t => somecondition);

I would love to be able to find out the index of the element that was returned, in fact, in my case a

Answer 1

If you know you have a list as opposed to something like an IEnumerbale or an IQueryable this might be nice ...

public static int IndexOf(this IList source, Func condition)
{
    for (int i = 0; i < source.Count; i++)
        if (condition(source[i]))
            return i;

    return -1;
}