c# - 将 foreach 循环转换为 LINQ

Question

ModelBeams是 List<ModelBeam>和 linesPassingThroughBeamEndsInYDirection是 List<double> .

我怎么写下面的foreach循环使用 LINQ ？

foreach (var beam in ModelBeams)
{
    linesPassingThroughBeamEndsInYDirection.Add(beam.ConnectivityLine.I.Y);
    linesPassingThroughBeamEndsInYDirection.Add(beam.ConnectivityLine.J.Y);
}

Answer 1

您可以使用 Linq 将两件选为一个集合，然后使用 SelectMany 将集合“展平”:

linesPassingThroughBeamEndsInYDirection.AddRange(
   ModelBeams.SelectMany(beam => new [] {
                                         beam.ConnectivityLine.I.Y, 
                                         beam.ConnectivityLine.J.Y}
                        ));