将foreach循环转换为LINQ

Question

ModelBeams是一个List<ModelBeam>,linesPassingThroughBeamEndsInYDirection是一个List<double>.

如何foreach使用LINQ？编写以下循环？

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选择两个部分作为集合,然后使用SelectMany"展平"集合:

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