How to get element index at PLinq ForAll

Question

I have the following code:

line.Split(' ').AsParallel().ForAll(word =>
{
    // How to get element index?
}

How do I get the current element's index? Is it possible?

Answer 1

There is an overload of Select that lets you access the index.

line.Split(' ')
    .AsParallel()
    .Select((w, i) => new { Index = i, Word = w })
    .ForAll(x => ...);

Answer 2

Instead use Parallel.Foreach that can provide indexes too.

Parallel.ForEach(line.Split(' '),(word,state,index) =>
{

});

Note that this is not plinq. it requires to importSystem.Threading.Tasks