我如何使用linq优化嵌套的for循环

Question

我怎么用linq写这个？

foreach (var to in allCurrentTradeObjects)
{
    foreach (var ro in theseWantMe)
    {
        if (ro.Type != to.Type
                || ro.MaxRent < to.Rent
                || ro.MinRooms > to.Rooms
                || ro.MinSquareMeters > to.SquareMeters
                || ro.MaxPrice < to.Price
                || ro.MinFloors > to.Floors
                || ro.TradeObjectId == to.TradeObjectId
                || ro.TradeObjectId == myTradeObject.TradeObjectId)
        {
            continue;
        }
        RatingListTriangleModel rlt = new RatingListTriangleModel
        {
            To1Id = myTradeObject.TradeObjectId,
            To2Id = to.TradeObjectId,
            To3Id = ro.TradeObjectId,
            T1OnT2Rating = 0,
            T2OnT3Rating = 0,
            T3OnT1Rating = 0,
            TotalRating = 0
        };

        //_context.RatingListTriangle.Add(rlt);
        this.InsertOrUpdate(rlt);

    }
}
this.Save();

Answer 1

var query = from to in allCurrentTradeObjects
            from ro in theseWantMe
            where ro.Type == to.Type &&
                  ro.MaxRent >= to.Rent &&
                  ro.MinRooms <= to.Rooms &&
                  ro.MinSquareMeters <= to.SquareMeters &&
                  ro.MaxPrice >= to.Price &&
                  ro.MinFloors <= to.Floors &&
                  ro.TradeObjectId != to.TradeObjectId &&
                  ro.TradeObjectId != myTradeObject.TradeObjectId
            select new RatingListTriangleModel
            {
                To1Id = myTradeObject.TradeObjectId,
                To2Id = to.TradeObjectId,
                To3Id = ro.TradeObjectId,
                T1OnT2Rating = 0,
                T2OnT3Rating = 0,
                T3OnT1Rating = 0,
                TotalRating = 0
            };

foreach(var rlt in query)
   this.InsertOrUpdate(rlt);

this.Save();