C# Difference between First() and Find()

Question

So I know that Find() is only a List method, whereas First() is an extension for any IEnumerable. I als

Answer 1

Here's the code for List.Find (from Reflector):

public T Find(Predicate match)
{
    if (match == null)
    {
        ThrowHelper.ThrowArgumentNullException(ExceptionArgument.match);
    }
    for (int i = 0; i < this._size; i++)
    {
        if (match(this._items[i]))
        {
            return this._items[i];
        }
    }
    return default(T);
}

And here's Enumerable.First:

public static TSource First(this IEnumerable source, Func predicate)
{
    if (source == null)
    {
        throw Error.ArgumentNull("source");
    }
    if (predicate == null)
    {
        throw Error.ArgumentNull("predicate");
    }
    foreach (TSource local in source)
    {
        if (predicate(local))
        {
            return local;
        }
    }
    throw Error.NoMatch();
}

So both methods work roughly the same way: they iterate all items until they find one that matches the predicate. The only noticeable difference is that Find uses a for loop because it already knows the number of elements, and First uses a foreach loop because it doesn't know it.