将用VB.NET编写的LINQ转换为C#

stacks.AddRange(
    From bin In UpstreamBinNames 
    Where bin <> BinName(BeforeTrack) 
    Select binWall = ConfigGlobals.Bins(bin).Wall 
    From aStack In binWall.Stacks Select aStack)

我得到了第一部分,但后半部分变得令人困惑.如果没有LINQ,我怎么能重写呢？

谢谢.

foreach(var bin in UpstreamBinNames)
{
    if(bin != BinName(BeforeTrack)
    {
        var binWall = ConfigGlobals.Bins(bin).Wall;
        foreach(var aStack in binWall.Stacks)
        {
            stacks.Add(aStack);
        }
    }
}