Break parallel.foreach?

by

Use the ParallelLoopState.Break method:

 Parallel.ForEach(list,
    (i, state) =>
    {
       state.Break();
    });

Or in your case:

Parallel.ForEach<ColorIndexHolder>(ColorIndex.AsEnumerable(),
    new Action<ColorIndexHolder, ParallelLoopState>((ColorIndexHolder Element, ParallelLoopState state) =>
    {
        if (Element.StartIndex <= I && Element.StartIndex + Element.Length >= I)
        {
            Found = true;
            state.Break();
        }
    }));

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