List<Object> 使用Linq

List<Asset> bdList = allAsset.Where(m => m.Owner.Depts == view.DeptName).ToList();
var query = from item in bdList
group item by new
{
mainName = item.MainCategory.Name,
subName = item.SubCategory.Name,
assetName = item.Name,
stateName = item.State.Name
}
into gp
select new
{
MainCategory = gp.First().MainCategory.Name,
SubCategory = gp.First().SubCategory.Name,
AssetName = gp.First().Name,
StateName = gp.First().State.Name,
CostTotal = gp.Sum(m => m.Cost)
};