将foreach循环转换为LINQ

Question

ModelBeams是List<ModelBeam>，linesPassingThroughBeamEndsInYDirection是List<double>。

如何使用foreach编写以下LINQ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”该集合：

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

Answer 2

类似的东西：

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

应该做的伎俩。

Answer 3

使用此：

ModelBeams.ForEach(mb => 
{
    linesPassingThroughBeamEndsInYDirection.Add(mb.ConnectivityLine.I.Y);
    linesPassingThroughBeamEndsInYDirection.Add(mb.ConnectivityLine.J.Y);
});