从列表中删除我正在迭代的项目,或者过滤复杂的重复列表

Question

好吧,也许我只是瞎了,但回答是在逃避我:

所以,型号:

public class Dimensions
{
    public int Width { get; set; }

    public int Height { get; set; }

    public int TypeId { get; set; }

    public int PeacesForItem { get; set; }
}

我有一个过滤List的方法:

public List<Dimensions> Consolidation(List<Dimensions> vm)
    {
        var list = new List<Dimensions>();
        if (vm != null)
        {
            var typeIds = vm.Select(x => x.TypeId).ToHashSet();
            foreach (var t in typeIds)
            {
                foreach(var item in vm)
                {
                    if (t == item.IvericaId)
                    {
                        int x = 0;
                        foreach (var again in vm)
                        {
                            if (item.Duzina == again.Duzina && item.Sirina == again.Sirina && item.TypeId== again.TypeId)
                            {
                                x ++;
                                // vm.Remove(item); Not working, who would figure 
                            }
                        }
                        list.Add(
                            new Dimensions
                            {
                                Width = item.Width,
                                Height = item.Height,
                                TypeId= item.TypeId,
                                PeacesForItem = x * item.PeacesForItem,
                            }
                        );
                    }
                }
            }
        }
        return list;
    }

此方法通过List项目进行迭代,并检查是否存在相同维度的元素.如果有,那么它需要的数量加倍.

问题:此代码仍在向新列表添加重复项,我需要对其进行过滤.

我尝试了很多方法,但我想出的每一个方法都有一些致命的缺陷.

Answer 1

public List<Dimensions> Consolidation(List<Dimensions> vm)
{
    return vm.GroupBy(d=>new {d.TypeId, d.Width, d.Height}) // if there are any duplicates, they are grouped here
            .Select(g=>new Dimensions(){TypeId = g.Key.TypeId , 
                                        Width = g.Key.Width, 
                                        Height = g.Key.Height,
                                        PeacesForItem = g.Sum(dim=>dim.PeacesForItem)}) // number of duplicates in group calculated
            .ToList();
}